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JUATIKA
JURNAL AGRONOMI TANAMAN TROPIKA
VOL.
3 NO.
1 Januari 2021
LEACHING OF NITROGEN FOR LIME APPLICATION AND NPK
SLOW DECOMPOSE FERTILIZER OF
CORN (Zea mays sacchararata Stur.
GROWTH IN PEATLANDS Rudi Yanto Sirait*.
Wawan Dan Adiwirman Program Studi Ilmu Pertanian Pascasarjana Universitas Riau Universitas Riau Kampus Bina Widya Km.
12,5 Simpang Baru Pekanbaru .
* email rudysirait31@gmail.
ABSTRACT
Utilization of peat as agricultural land faced the problem of low soil fertility.
Low soil fertility made nitrogen being leached easily.
One solution to overcome Nitrogen leaching and efficiency fertilizer raising used dolomite and slow decompose This study aims to determine the effect of dolomite on Nitrogen element leaching in several types of NPK slow decompose applied for corn cultivation in peatland and determine the best dolomite dosage and NPK slow decompose with minimum Nitrogen leaching to optimum sweet corn plant growth in peatland.
This research was conducted from August to October 2018 in the Experimental Garden Technical Implementation Unit and Soil Laboratory.
Faculty of Agriculture.
University of Riau.
This research used experimentally and completely randomized design (CRD) factorial.
The first factor is dolomite which consists of 4 levels .
ha-1, 2.
ha-1, 5 tons.
ha-1, dan 7.
5 tons.
The second is NPK slow decompose which consists of 4 levels (NPK single pearl.
NPK 13: 6: 27: 4 0,65B Mahkota B.
NPK 13:
6: 27: 4 0,65B Compound Plus Hi-Kay and NPK 13: 8: 27: 4 MgO Ztic.
The results showed the administration of dolomite 23.
55 g per tube and NPK slow decomposed could reduce Nitrogen leaching, improve physiology and growth of sweet corn plants.
Provision of interaction between dolomite 5 ton.
ha-1 with NPK slow decomposition .
25 N, 3.
72 P, 12.
56 g per tub.
produces the best interaction that can reduce the proportion of Nitrogen leaching and it can affects the increasing of plant growth.
Keywords : Dolomite.
Peat, slow decomposed NPK.
Nitrogen leaching INTRODUCTION The potential for peatlands in Indonesia is large enough to be used as an area for agricultural extension.
The area of peatland in Indonesia 93 million ha, and can be found in Papua.
Kalimantan and Sumatra (Ritung et al.
, 2.
Riau is one of the provinces has large The area of peatland in Riau (Kementan, 2.
Utilization of peatland for plant cultivation faced several obstacles, namely low fertility of peat soil characterized by low soil pH .
, the number and availability of nutrients N.
P low, levels of bases (K.
Ca.
Mg, and N.
and alkaline saturation.
nutrient leaching .
eaching of nutrient.
for example Nitrogen nutrients (Sasli.
In addition, the high soil porosity can lead to high leaching of the elements as well.
Nitrogen is a nutrient that is highly leached in peat The results of research by Razzaque and Hanafi .
showed that the loss of N in peatland ranges from 55-66% of the N applied.
The efforts to overcome some of the constraints of soil chemical, such as pH, levels of bases (Ca.
Mg.
Na and K) and low base saturation can be done by liming.
According to Sasli .
giving ameliorants such as lime .
alcite or dolomit.
, or ash can increase soil pH, the number and availability of bases and base However, the application of ameliorants such as lime must be appropriate, because applying lime or ash in high dose can cause high nutrient leaching.
The application of lime can improve soil fertility in increasing the activity of nitrifying transformed into nitrate, so it cannot be absorbed by soil colloids.
As a result, nitrogen leaching is very high which results in low nitrogen nutrient uptake by plants.
In addition, increasing the dose of lime can increase the solubility of humic compounds (Sukron et al.
, 2.
Humic compounds in peatland are organic colloids are very important relate to leached the nutrient.
becomes problem in nutrient supply.
this connection, it is necessary to find the right amount of lime in the sense that it can improve the chemical properties of peatland but with relatively low nutrient leaching and One solution to overcome leaching and increase the efficiency of high fertilization is to use a slowdegradation Slowly decomposing fertilizers are fertilizers that are able to control nutrients that are easily lost due to water solubility, volatility and denitrification (Trankel.
The results of Suwardi's .
research show that giving NPK slow decompose can save fertilization which is usually done by farmers three times in one planting season, just In this way can save fertilizer and labor.
It cause NPK technology is slow to decompose, it can release nutrients gradually according to plant needs, minimize nutrient loss, thereby increasing the efficiency of fertilizer use, providing nutrients for a longer period of time, reducing the frequency of fertilizer application, and minimizing toxicity (Subbarao et al.
, 2006 ).
There are several types of NPK slow decompose fertilizer, such as NPK Mahkota B .
: 6: 27: 4 0.
65B),
NPK Hi-Kay Plus .
: 6: 27: 4 0.
and NPK Ztick .
: 8: 27: 4 MgO).
Physically, fertilizer coatings are prepared from a variety of materials can reduce the dissolution rate.
NPK
fertilizer is type NPK Mahkota B .
: 6:
27: 4 0.
65B) has raw material N (Urea / ZA / DAP).
P (DAP / RP).
(MOP) with a wax / oil (MFO) coating.
NPK Compound Hi-Kay Plus .
: 6:
27: 4 0.
65B) has raw material N (Urea / DAP / MAP).
P (CIRP /
Reaktive / DAP).
K (MOP).
NPK Ztick .
: 8: 27: 4 MgO) is a special formulated to contain primary and secondary macro nutrients, essential micro elements and in the form of stems, wrapped in materials made from organic matter (Department of Agriculture, 2.
However, it is not yet known which species are effective and how efficient they are on peatland planted sweet corn.
Which type of the best of NPK slow-decompose for productivity as well as suppressing the leaching of nutrients, especially Nitrogen.
Therefore, it is necessary to conduct research to examine the correlation between N loss and plant growth, so it is necessary to use maize as an indicator.
This study aims to determine the effect of dolomite application on nitrogen leaching in several types of NPK slow-decompose applied to sweet corn cultivation on peatland and to determine the best dose of dolomite and NPK slow-decompose types able nitrogen leaching with minimal to optimum growth of sweet corn on MATERIALS AND METHODS This research was conducted in the experimental garden greenhouse.
Faculty of Agriculture.
Riau University.
Bina Widya Campus Km 12.
Simpang Baru.
Tampan.
Pekanbaru in altitude of 10 m above sea level.
The screen house conditions have an average temperature of 30-400C and light intensity of 1694 lux .
The materials used in this study were samples of peatland type ombrogen sapric layer taken from oil palm plantations in Mandau area.
Siak, belonging to First Resources (FR), sweet corn seeds of Bonanza F1 varieties, lime .
P and K single (Urea.
TSP.
KC.
NPK slow-decompose fertilizers, (NPK Mahkota B.
NPK Hi-Kay Plus.
NPK Ztic.
, liquid organic fertilizers (NASA), water and chemicals was used to analysis in the laboratory.
The tools were used are ovens.
AAS, analytical scales, plastic bags, rubber.
PVC pipes, gauze filters, hoes, sprayers, mortar pestles, measuring cups, glas beakers, erlenmeyers, test tubes, film bottles, shakers, basins and stationery.
This research is factorial experiment 4 x 4 repeated 3 times Completely Randomized Design (CRD).
The first factor is the provision of dolomite which consists of 4 levels, namely: D0:
0 ton.
D1: 2.
5 ton.
ha-1 or .
per tub.
D2: 5 ton.
ha-1 or ( 15.
per tub.
D3: 7.
5 ton.
ha-1 or .
per tub.
The second factor is NPK0:
(Recommendatio.
NPK1: NPK .
6: 27: 4 0.
65B) Crown B or .
gram N equivalen.
NPK2: NPK .
6: 27: 4 0.
65B) Hi-Kay Plus or .
gram N equivalen.
NPK3: NPK .
8: 27: 4 MgO) Ztick or .
05 gram N Initial Peat Soil Chemical Properties The chemical properties of the peatland in the research location before being treated are presented in Table.
Soil chemical properties Unit
pH H2O
Value Status* Very sour
C organic Very high
organic matter
Very high
N total
Moderate Very high
C/N
P potential (HCl 25%) K- total (HCl 25%) Very low Ca-dd me 100 g-1 Low K-dd me 100 g-1 Low Mg-dd me 100 g-1 Very low Na-dd me 100 g-1 Moderate CEC me 100 g-1 Very high Low Base Saturation Very low Information * = Status of chemical properties refers to the Soil Research Center .
Based on the data in Table 1, it stated that peatland was used is classified as less fertile.
It is characterized by chemical properties, namely very acidic soil reactions, very high C / N, very low potential P and very low K.
Other characteristics are low Ca-dd and K-dd, very low Mg-dd and low base saturation.
The peatland samples were used for Mandau oil palm plantation.
Siak, which has very acidic soil The peatland used is ombrogen peat which is composed of organic matter, plant debris and rotting plant tissue.
Ombrogenic peat usually has low bearing capacity, very low pH and soil fertility.
This is consistent with several research reports on peatland.
High acidity in tropical peatland caused by poor drainage conditions and the occurrence of hydrolysis of organic acids (Dariah et al.
, 2.
Noor .
also states that the decomposed organic material has reactive groups such as carboxylates (-COOH) and phenolics (C6H4OH) which dominate the exchange complex and are weak acids so that they can dissociate and produce large amounts of H ions.
The peatland used in this study has very high C / N.
The C / N content ratio shows the decomposition rate of organic matter in the soil.
The C / N ratio indicates the size or size of the accumulated carbon.
The higher the C / N ratio value, the more carbon can be accumulated so that the level of Peatland management causes soil microbiological activity and the rate of decomposition increases (Barchia.
According to Fahmi and Radjagukguk .
, high C / N causes most of the N element to be taken up by microorganisms as a source of energy in the process of weathering or changing organic matter, so that nutrient availability for plants will decrease.
An overhaul is said to be perfect if the C / N ratio is less than 20 (Murayama and Abu Bakr, 1.
Therefore, to meet the optimum need for N plants.
N fertilization is needed.
One of the widely used sources of N fertilizer is Basic cations (Ca-dd.
K-dd and Mg-d.
in peatlands are classified as This is due to organic compounds and very high cation exchange capacity (CEC).
According to Ratmini .
organic acids contain carboxyl and phenolic groups, where the carboxyl and phenolic functional groups are the source of negative Peatlands are characterized very high CEC, but very low percentage of base saturation (KB) can make it difficult to absorb nutrients, especially bases needed by The low holding power of base cations causes nutrients to dissolve easily, especially nitrogen, so it needs several times fertilization with low Nitrogen is absorbed by plants in the form of ammonium and nitrate.
Ammonium has positive mutation can bind to soil colloids negatively charged so that it is not easily dissolved .
, but nitrate cannot bind to soil colloids so it is easily leached and results in low fertilization efficiency (Lingga, 2.
Chemical Properties of Peat Soil after being treated Peat soil pH The results of variance showed the main effect of giving dolomite and NPK slow decompose, as well as the interaction between dolomite and NPK slow decompose have significant effect on the pH of the peatland in observations 2, 4, and 10 MST.
The results of Tukey's further test at the 5% level are shown in Table 4.
Table 2.
The pH value of peat soil treated with dolomite and NPK is slow to Dolomit .
Average Average Average NPK Fertilizer .
ram / plan.
NPK0
NPK1
NPK2
NPK3
----------------------Week 2 ----------------------4.
-----------------------Week 4 ----------------------4.
-----------------------Week 10 --------------------4.
Average The numbers followed by the same lowercase letter are not significantly different according to the Tukey test at 5% level There is an interaction effect 5 ton.
ha-1 dolomite and NPK3 species, and between 5.
ha-1 dolomite and NPK1 at 2 MST At 4 MST there was an interaction effect between 2.
5 ton.
dolomite and NPK1 species, between 5 ton.
ha-1 dolomite with NPK1.
NPK2 dolomite and 5.
0 ton.
dolomite with NPK1 types.
Likewise, at 10 MST observations there was an interaction effect between dolomite 2.
g ton.
ha-1 and NPK3 species.
Increasing the dose of dolomite from 0 5 tonnes.
ha-1 in the NPK3 type resulted significantly increasing soil pH and the highest compared to NPK1 and NPK2 and there was tendency for same pattern to soil pH after dolomite application and NPK slow decompose 4 and 10 MST (Table .
It thought due to the influence of the interaction between dolomite and NPK, slow decompose can improve soil fertility by increasing the pH of the peatland.
Dolomite provides supply of OH- to soil solution can reacts with H to become water and causes the H level to decrease so the soil pH increases.
Application of NPK slow decompose fertilizer has effect on increasing the pH of the peatland.
According to Winarso .
, soil pH has a strong influence on nutrient availability, the increasing soil pH, the more soil nutrient availability increases.
affects nutrient absorption by plants (Heriansyah, 2.
Peatland Electrical Conductivity The results of variance showed the main effect of giving dolomite and NPK slow decompose, and interaction between dolomite and NPK slow decompose had significant effect on electrical conductivity in observations 2 and 4 MST.
Meanwhile, dolomite administration and interaction between dolomite and NPK slow decompose had no significant effect, however.
NPK was given significant effect on the electrical conductivity at 10 MST observations (Attachment 5.
Tukey's further test results at the 5% level are shown in Table 4.
Table 3.
Electrical Conductivity .
S / .
of 10 cm peat soil treated with dolomite and NPK slow decompose fertilizer Dolomit .
NPK Fertilizer .
/ plan.
NPK0
NPK1
NPK2
NPK3
--------------------------Week 2 ---------------------- Average ---------------------------Week 4 --------------------0.
---------------------------Week 10 ------------------0.
Average Average Average The numbers followed by the same lowercase letter are not significantly different according to the Tukey test at 5% level There is an interaction effect 5 ton.
ha-1 dolomite with NPK3 and NPK1 types, between 2.
ha-1 dolomite and NPK2 species and between 5.
0 ton.
ha-1 dolomite and NPK1 species at 2 MST At 4 MST there is an interaction effect between 5.
0 and 7.
ha-1 dolomite with NPK1 types, also between 7.
5 ton.
ha-1 dolomite with NPK1 and NPK2 types and 5 ton.
ha-dolomite 1 with the NPK2 type at 10 MST observations.
Increasing the dolomite dose from 0 to 5 tonnes.
ha-1 with the NPK3 type resulted in a significant increase in electrical conductivity (DHL) and the highest compared to NPK1 and NPK2 types at 2 MST, while the 4 and 10 MST observations were between 7.
dolomite doses ton.
ha-1 with NPK1 and NPK2 types produced DHL which increased significantly and was the highest compared to NPK3 types (Table 4.
It thought due to influence of interaction between dolomite and NPK slow decompose can increase availability of nutrients, such as N.
K and Ca.
Mg.
High levels of nutrients, especially Ca and Mg cations, can increase electrical conductivity of peatlands (Brotowijaya et al, 1.
Ammonium.
Nitrate and Proportion of Leached Nitrogen The results of variance showed the main effect of dolomite and NPK slow decompose significantly affected ammonium, leached nitrate and leached nitrogen proportion, while the interaction between dolomite and NPK slowl decompose had no significant effect on ammonium and leached nitrate except for proportion of leached The results of Tukey's further test at the 5% real level are shown in Table 4.
Administration NPK1 produced lower leachate ammonium than NPK2 and NPK3.
Meanwhile, giving NPK1 and NPK3 resulted in different and lower leachate nitrate than NPK2.
The application of NPK slow decompose resulted lower proportion of dissolved nitrogen than non-NPK slow degradation.
NPK type treatment slow to decompose.
NPK1 produces lower proportion of leached nitrogen than NPK2 and NPK3.
This is due to the slow degradation nature of can cause low solubility, but can provide nutrients sustainably for a longer time.
Thus.
NPK slow decompose will retain the N content in the soil in the form of NH4 .
Availability can inhibit nitrification so as to maintain high NH4 concentrations for a longer time in the field (Joseph and Prasad, 1993 in Prasad and Power, 1.
Yoshida .
stated that NH4 in soil is the main source of N in maize/corn, approximately 70% N is taken from the soil.
Furthermore, it was stated that maize/corn was tolerant of high NH4 concentrations, and in the early growth phase maize/corn preferred to absorb NH4 than NO3-.
Adequacy of N in the vegetative growth phase is important factor for plant growth.
Nitrogen is absorbed by plants in the form of NO3and NH4 ions.
Table 4.
Ammonium.
Nitrate and Nitrogen Proportion leached from peatland fed by dolomite and NPK slow decompose fertilizer Dolomit .
Average Average Average NPK Fertilizer .
/ plan.
NPK0
NPK1
NPK2
NPK3
-------------------Ammonium .
---------------30.
------------------------- Nitrat .
---------------51.
------------------ Proporsi Nitrogen (%)-----------2.
Average The numbers followed by the same lowercase letter are not significantly different according to the Tukey test at 5% level The slowthe experiment were in the range of decomposed of non-NPK dissolved 24-29 0C, so the conversion of urea to nitrogen was higher than the slowammonium would be even faster.
decomposing type of NPK, where the Growth Response nitrogen obtained from non-NPK Plant height slowly degraded was derived from The results of variance showed According to Alexander .
, the main effect of giving dolomite had explaining that urea which is given to significant effect, while NPK slow the soil will immediately hydrolyze in decompose and interaction between less than 1 week.
N-urea is dolomite and NPK was not significantly transformed into ammonium form at 10 affected by the height of sweet corn The conversion will be faster at The results of Tukey's further high temperatures.
The results of test at the 5% real level are shown in observations of soil temperature during Table 4.
Table 5.
Plant height .
of sweet corn given dolomite and NPK slow decompose Dolomit .
Average NPK Fertilizer .
/ plan.
NPK0
NPK1
NPK2
Average NPK3 The numbers followed by the same lowercase letter are not significantly different according to the Tukey test at 5% level Increasing the dose of dolomite application of NPK is relatively with NPK slow-decompose and nonavailable due to the addition of N NPK slow-decompose types resulted fertilizer, which is a limiting factor for in the same high interaction of sweet the growth of maize plants.
The corn plants, but there was tendency to element N in sweet corn cultivation is increase plant height.
Giving dose of used to stimulate the growth of roots, 5 ton.
ha-1 dolomite with NPK3 stems, leaves and plant height species produced the highest plant (Sirajuddin et al.
, 2.
Suryanti height compared to other treatments .
states that the availability of (Table .
This is due to the slow sufficient N nutrient causes plant degradation characteristics of NPK are metabolic activities to increase.
available slowly so initial stage there is Number of Leaves disturbance causes the plant to burn.
The results of variance showed In general, plant height growth without that the main effect of giving dolomite dolomite was lower than other had a significant effect, while NPK was This is due to the slow to decompose and the interaction availability of nitrogen for growth of between dolomite and NPK was not corn plants.
Increasing the dolomite significantly affected by the number of dosage from 2.
5 to 7.
5 tonnes.
sweet corn leaves.
The results of resulted in significantly different plant Tukey's further test at the 5% real level heights in various types of NPK sloware shown in Table 4.
The availability of N in the Table 6.
The number of leaves .
of sweet corn given dolomite and NPK slow decompose fertilizer Dolomit .
Average NPK Fertilizer .
/ plan.
NPK0
NPK1
NPK2
Average NPK3 The numbers followed by the same lowercase letter are not significantly different according to the Tukey test at 5% level There is interaction effect between dolomite 2.
5 ton.
ha-1 with NPK0 and NPK1 types, but it does not significantly increase the number of leaves compared to other treatments except for dolomite 0 g per tube with NPK3 (Table .
Its because increasing dose of dolomite cannot increasing availability of nutrients in the soil.
The optimum number of distribution or distribution of light between leaves in all parts of the plant.
The more leaves of the plant, the easier is for the leaves to get sunlight from various directions, so the rate of photosynthesis (Table 4.
will be The better the rate of photosynthesis, the better the plant growth will be.
Male Flowers Appear The results of variance showed the main effect of giving dolomite.
NPK slow decompose and the interaction between dolomite and NPK slow decompose had significant effect on appearance of male flowers (Annex The results of Tukey's further test at the 5% real level are shown in Table 4.
Table 7.
The male flowers (HST) of sweet corn given dolomite and NPK slow decompose fertilizer Dolomit .
Average NPK Fertilizer .
/ plan.
NPK0
NPK1
NPK2
Average NPK3 The numbers followed by the same lowercase letter are not significantly different according to the Tukey test at 5% level Increasing dose of dolomite with NPK slow-decomposing types and non-NPK slow-decomposing species did not show result in significantly different interactions with male flower appearing except for dolomite and NPK0 (Table .
Its because giving higher doses of dolomite can improve soil properties in providing nutrients.
Giving dolomite is more influential in improving soil nutrient status than NPK slow decompose because dolomite can affect the availability of more nutrient amounts.
Increasing soil N.
P, and K nutrients play a role in accelerating the appearance of male flowers (Noza et al.
, 2.
Flower appears female The results of variance showed the main effect of giving dolomite had significant effect, while NPK slow decompose and between dolomite and NPK slow decompose had no significant effect on the appearance of female flowers.
The results of Tukey's further test at the 5% real level are shown in Table Table 8.
The female flowers (HST) of sweet corn given dolomite and NPK slow decompose fertilizer Dolomit .
Average NPK Fertilizer .
/ plan.
NPK0
NPK1
NPK2
Average NPK3 The numbers followed by the same lowercase letter are not significantly different according to the Tukey test at 5% level Increasing dose of dolomite with NPK slow-decomposing and non-NPK slow-decomposing types did not produce significant difference between appearance of female flowers except between 0 ton.
ha-1 dolomite and NPK2 and between 2.
5 ton.
dolomite and NPK0 (Table .
This is due to fact that dolomite with NPK slow decompose can improve soil chemical properties by increasing nutrient availability, by increasing pH (Table 4.
The increase in pH can affect the availability of nutrients where the flowering period requires the role of macro nutrients, namely N.
P and K.
Corn generative phase and in this case the macro elements that play a greater role are Nitrogen (N) and Phosphorus (P).
Elemental N is only needed in small amounts, while P is needed more for the formation of flowers.
This was also expressed by Marschner .
in Marvelia et al.
, stated that the nutrient N plays a role in flowering, but the role of N is not as big as the role of P in the formation of had significant effect on the root volume of sweet corn at 4 WAP However, the application of dolomite and NPK slow decompose had significant effect, while the interaction between dolomite and NPK slow decompose had no significant effect on the root volume of sweet corn at 5 and 10 MST observations.
The results of Tukey's further test at the 5% real level are shown in Table 9.
Root Volume The results of variance showed the main effect of giving dolomite and NPK slow decompose and interaction of dolomite and NPK slow decompose Table 9.
Root volume .
of sweet corn treated with dolomite and NPK slow decompose fertilizer Dolomit .
Average Average Average NPK Fertilizer .
/ plan.
NPK0
NPK1
NPK2
NPK3
----------------------Week 4 ----------------------16.
-----------------------Week 5 ----------------------24.
----------------------Week 10 ----------------------81.
Average The numbers followed by the same lowercase letter are not significantly different according to the Tukey test at 5% level There is interaction effect 5 and 7.
5 ton.
ha-1 dolomite with NPK0 at 4 MST.
At 5 MST there is interaction effect of increasing the dose between 2.
5 to 7.
5 ton.
dolomite and NPK0, between 2.
ha-1 dolomite with NPK2.
NPK2 and NPK3 and between 7.
5 ton.
dolomite -1 with the types of NPK2 and NPK3.
Likewise, at 10 MST there was interaction effect between 7.
5 ton.
dolomite and NPK0 and between 7.
ha-1 dolomite with NPK2 and NPK3 (Table .
Its because provision of dolomite and NPK slow decompose can improve the condition of the peatland by increasing the availability of nutrients in the peatland.
Nutrient adequacy is very important for plant growth because it will affect the plant growth process, including root growth.
Root growth includes lengthening and widening the roots which will be environmental factors.
The planting medium factor is related to its carrying capacity for root growth as an organ that functions to absorb water and Sinaga and Ma'ruf .
through their research concluded that giving N.
P, and K nutrients to sweet corn plants increased root volume.
Plant Dry Weight The results of variance showed the main effect of dolomite and NPK significant effect, while the interaction of dolomite and NPK slow decompose had no significant effect on plant dry weight in 4 and 5 MST observations.
Giving dolomite and giving NPK slow decompose and interaction of dolomite with NPK slowl decompose had significant effect on plant dry weight at 10 WAP observations.
The results of Tukey's follow-up test at the 5% significance level are shown in Table Table 10.
Plant dry weight .
of sweet corn treated with dolomite and NPK slow decompose fertilizer Dolomit .
Average Average Average NPK Fertilizer .
/ plan.
NPK0
NPK1
NPK2
NPK3
----------------------Week 4 ----------------------4.
---------------------- Week 5 ----------------------15.
---------------------- Week 10 ----------------------38.
Average The numbers followed by the same lowercase letter are not significantly different according to the Tukey test at 5% level There is interaction effect 5 and 7.
5 ton.
ha-1 dolomite with NPK0 at 4 MST.
At 5 MST there is interaction effect of increasing the dose between 5.
0 to 7.
5 dolomite with NPK3, also between 5.
0 and 7.
ha-1 dolomite with NPK0 and 5 ton.
ha-1 dolomite and NPK3 at 10 MST (Table .
This is due to the application of dolomite and NPK slow to decompose, which can improve soil fertility by increasing pH (Table 4.
and providing sufficient nutrient availability in peatland to help plant growth.
Imam and Widyastuti .
stated the height and the low dry weight of the plant depends on the amount or at least of nutrient uptake during the plant growth process.
In line with Dwijoseputro's .
opinion that the dry weight of a plant is influenced by optimal photosynthesis because the dry weight of a plant depends on the amount of accumulated carbohydrates in the plant body.
The photosynthesis process will run well if the environmental conditions for growth are favorable.
Growth rate growth rate of sweet corn plants.
The The results of variance showed results of Tukey's further test at the 5% that the main effect of dolomite and real level are shown in Table 11.
NPK was slow to decompose and that the interaction between dolomite and NPK was significantly affected by the Table 11.
The growth rate .
/ day / plan.
of sweet corn given dolomite and NPK slow decompose fertilizer Dolomit .
Average NPK Fertilizer .
/ plan.
NPK0
NPK1
NPK2
Average NPK3 The numbers followed by the same lowercase letter are not significantly different according to the Tukey test at 5% level There is interaction effect 5 ton.
ha-1 dolomite and NPK1, between 5.
0 and 7.
5 ton.
dolomite and NPK3 (Table .
Its because application of dolomite and NPK slow decompose can improve the soil fertility of the peat, thereby affecting the rate of plant growth, seen from data such as photosynthesis rate (Table 4.
and plant dry weight (Table .
in a time interval and in relation to the original weight.
The difference in plant size occurs between plants of the same age even when planted in the same environment, but different absorption is strongly influenced by the environment (Heriansyah et al, 2.
Larger plants produce new, taller photosynthetic active leaves and roots actively absorb more nutrients and water than smaller plants (Sitompul Guritno.
Nutrient absorption is also influenced by the availability of growth hormone in plants (Heriansyah & Indrawanis, 2.
The translocated to all parts of the plant to support the growth rate in the generative and vegetative phases of the plant.
Conclusions Giving dolomite 7.
5 ton.
ha-1 can reduce the proportion of leached nitrogen, increasing the physiology and growth of sweet corn plants such as plant height, leaves, root volume, plant dry weight and plant growth rate compared without Giving NPK slow decompose can reduce the proportion of dissolved physiology such as chlorophyll content and plant growth such as plant dry weight compared without NPK slow decompose.
Having the interaction between 5 ha-1 dolomite and NPK slowly decomposed resulted in different responses were able to suppress the proportion of leached nitrogen, thereby affecting the increase in plant growth.
REFERENCES