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Effect of liming, manure, and NPK fertilizer application on growth and yield performance of soybean in swamp land

Effect of liming, manure, and NPK fertilizer application on growth and yield performance of soybean in swamp land

Abstract: Increased productivity and the expansion of planting area to potential land are two strategies to increase soybean production. Swamp land is one of potential land. Acidic soil, poor fertility, and toxicity become limiting factors for soybean development in this area. Objective of this research was to determine effect of liming, organic and NPK fertilizer application on soybean yields in swamp land. On- farm trial had been conducted on swamp land of C type in South Kalimantan. Treatments consisted of two factors, laid out in randomized complete block design, replicated three times. The fist factor was three doses of manure (0, 2.5, and 5.0 t/ha). The second factor was four combinations of NPK fertilization dosage, (1) 0-0-0, (2) 22,5-36-30, (3) 22,5-54-60, and (4) 45-72-60 kg N-P 2 O 5 -K 2 O per hectare.
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EFFECT OF ADDINGELA SAGO AS ORGANIC FERTILIZER ON CORN (Zea mays L.) TO REDUCE USE OF NPK FERTILIZER IN ALINDAU VILLAGE SINDUE SUB DISTRICT DONGGALA DISTRICT

EFFECT OF ADDINGELA SAGO AS ORGANIC FERTILIZER ON CORN (Zea mays L.) TO REDUCE USE OF NPK FERTILIZER IN ALINDAU VILLAGE SINDUE SUB DISTRICT DONGGALA DISTRICT

Donggala is one of corn producer regencies in Central Sulawesi province supported by suitable climatic factors, regional potency and society aspect. Since 2001, the government has promoted GemaPalagung program (Movement of Rice, Soybean and Corn Self-Reliance). This program was evidently effective as shown by increasing in corn production, although it has yet to meet the domestic need of corn which is then lead to corn import (Purwono and Hartono, 2008). This indicates that efforts to increase corn production are still necessary (Ekowati and Nasir, 2011). One effort to increase production is by fertilization, especially by minimizing the use of chemical fertilizers (inorganic) that have a negative impact. Waste of processed sago known as elasaguis an organic material with high C/N ratio potentially to be used as an organic fertilizer through decomposition process. This research aimed at obtaining balanced elasagu organic fertilizer application and its efficiency when use in corn plantation. A randomized block design was used with five rate applications of the elasagu fertilizer i.e. no fertilizer applied (control), 35 g NPK fertilizer applied, 0.7 kg elasagu applied, 0.35 kg ela sagu+50 g NPK fertilizer applied, and 0.7 kg ela sagu+35 g NPK fertilizer applied. The research results showed that the 0.7 kg ela sagu+35 g NPK fertilizer treatment leads to highest in plant height, leaf number, and plant dry weight.
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THE EFFECT OF HYDRATION-DEHYDRATION AND NPK FERTILIZER SUPPLEMENTARY ON VIABILITY OF SEED SOYBEAN (Glycine max [L.] Merr.) ANJASMORO

THE EFFECT OF HYDRATION-DEHYDRATION AND NPK FERTILIZER SUPPLEMENTARY ON VIABILITY OF SEED SOYBEAN (Glycine max [L.] Merr.) ANJASMORO

This research aims to determine: 1) Determine the effect invigorasi by means of hydration-dehydration on seed sources that have been saved 8 months in influencing the viability of soybean seed varieties Ajasmoro. 2) Determine the effect of increasing doses of NPK fertilizer Supplementary during flowering are given on the plants from seed sources in invigorize by means of hydration- dehydration on seed viability of soybean varieties produce Anjasmoro. 3) To Know the plantsthat seed source response to hydration-dehydration in invigorize to increasing doses of NPK Supplementary at the time of flowering in soybean varieties anjasmoro produce seed viability. This research was conducted in the Laboratory of Plant Breeding and Seed Technology Faculty of Agriculture, Lampung University in August to October 2009. The design of treatment trials in the field follow the pattern of the factorial (3 X 3); each treatment combination was replicated 3 times. The first factor is how the hydration-dehydration of control (H0), sticking (H1), and immersion (H2). The second factor is a supplementary dose of NPK fertilizer at the time of flowering of dosages of 0 kg / ha (P0), 75 kg / ha (P1), 100kg/ha (P2). The similarities range between treatments were tested with Bartlett test and subsequent tests used Tukey test model. Results obtained data were analyzed by F test planned and continued separation of the median value of the ratio of orthogonal level 0.05 and 0.01. The results showed that (1) hydration-dehydration treatment did not affect seed viability based on the simultaneity variable germinate and seedling dry weight of normal, (2) Provision of supplementary doses of NPK fertilizer did not affect seed viability response on simultaneity variable germinate and seedling dry weight of normal, (3 ) Without supplementary fertilizer, hydration-dehydration (sticking) is better in producing germination, germination speed, and length of germination than soaking while supplementary NPK fertilizer when given at doses 75-100 kg / ha in the way of hydration-dehydration (immersion) is better in producing germination, speed of germination, and seedling length than is moistened.
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Aplikasi Pupuk NPK Tablet dan Jumlah Cabang terhadap Pertumbuhan dan Produksi Tanaman Semangka (Citrullus vulgaris Schard) Apllication of NPK Fertilizer Tablets and the Number of Branches on the Growth and Yield of Watermelon (Citrullus vulgaris Schard)

Aplikasi Pupuk NPK Tablet dan Jumlah Cabang terhadap Pertumbuhan dan Produksi Tanaman Semangka (Citrullus vulgaris Schard) Apllication of NPK Fertilizer Tablets and the Number of Branches on the Growth and Yield of Watermelon (Citrullus vulgaris Schard)

Applications NPK fertilizer tablets and the number of branches on the growth and yield of watermelon was conducted in March 2000 to May 2000 in the gardens of farmers Km 10 Sukarame District of Palembang, South Sumatra. Fertilization with NPK tablets can be applied in combination with cutting branches growing plants crammed trimming needs to be done, in order to improve the quality of production, especially plants that produce flowers, fruits and seeds . This study aimed to examine the effect of the application of NPK fertilizer tablets and the number of branches on the growth and yield of watermelon. This study used a randomized block design ( RAK ) arranged in factorial with two treatment factors , namely fertilizer treatment (P) and branch pruning treatment (C) were repeated 3 times, the varieties used are sea dragon. The LSD (0,05) showed that treatment P3 (6 tablets manure crop ) is the best treatment, significantly different to the treatments P2, P1 and P0. The LSD (0,05) the effect of the number of branches showed that treatment C2 (maintained 3 main branch) is the best treatment, significantly different from C3 treatment (maintained 4 main branches) and did not differ significantly with treatment C1 (maintained two main branches). For both treatment interaction effect P2C2 provide the best interaction significantly different from other treatments.
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PENGARUH MEDIA TANAM DAN PEMBERIAN DOSIS PUPUK NPK TERHADAP PERTUMBUHAN BIBIT JATI PUTIH (Gmelina arborea) THE EFFECT OF MEDIA AND NPK FERTILIZER DOSE ON THE GROWTH OF WHITE TEAK (Gmelina arborea)

PENGARUH MEDIA TANAM DAN PEMBERIAN DOSIS PUPUK NPK TERHADAP PERTUMBUHAN BIBIT JATI PUTIH (Gmelina arborea) THE EFFECT OF MEDIA AND NPK FERTILIZER DOSE ON THE GROWTH OF WHITE TEAK (Gmelina arborea)

Reforestation and land rehabilitation should be implemented to reduce the impact of the forest degradation. Forest degradation due to illegal logging and forest fire led to an increased extent of degraded forest areas. In reforestation and land rehabilitation, healthy and good quality seedlings are required, in order to reach the expectations and growth in the field. One species of plant that have the potential to be developed for the rehabilitation of degraded land is white teak (Gmelina arborea). The purpose of this study is to determine the effect of media and NPK fertilizer dose on the growth of white teak seedlings. The method used is the experimental method with a completely randomized design (CRD), which consists of two factors. The first factor is the media and the second factor is the dosage of NPK fertilizer which consist of 9 combination treatments with 3 replications. Data were analyzed using analysis of variance (ANOVA) with further test BNT at 5% level. The results show that the use of media and dosage of NPK have a significant effect on the parameters observed. Treatment M 1 (soil)
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Peran Pupuk Organik dalam Meningkatkan Efektivitas Pupuk NPK pada Bibit Kelapa Sawit di Pembibitan Utama The Role of Organic Fertilizer to Increase the Effectiveness of NPK Fertilizer for Oil Palm Seedling in Main Nursery

Peran Pupuk Organik dalam Meningkatkan Efektivitas Pupuk NPK pada Bibit Kelapa Sawit di Pembibitan Utama The Role of Organic Fertilizer to Increase the Effectiveness of NPK Fertilizer for Oil Palm Seedling in Main Nursery

Main nursery is the first step affecting oil palm’s age and productivity. Good plant growth will produce high quality and yield of oil palm. The demand of oil palm seedlings for extensification and replantation increases continuously, and therefore this need to be supported by precise fertilization programs. The objectives of this experiment were to investigate the role of organic fertilizer and to obtain the best organic-NPK fertilizer combination in increasing the effectiveness of the use of NPK fertilizer for the growth of oil palm (Elaeis guineensis Jacq.) seedling in the main nursery. The experiment was conducted from December 2011 to September 2012 at IPB Teaching Farm Dramaga Bogor. The treatment was arranged in a factorial randomized block design with three replications. The first factor was amount of organic fertilizer consisted of 0:6, 1:6, 2:6, and 3:6 of the soil volume (6 kg). The second factor was NPK fertilizer rates, i.e., 0.0, 127.5, 255, and 382.5 g NPK per plant. The results showed that application of organic fertilizer increased the effectiveness of NPK fertilizer and could be a substitute for NPK fertilizer in oil palm seedlings. The best combination treatment was 2:6 (organic fertilizer:top soil) and 382.5 NPK g per plant with effectiveness of 158.9, 209.1 and 170.1 % for plant height, leaf number and stem diameter, respectively. The efficiency of N, P, and K application were 56.2, 11.1, and 29.0% for the same variables, respectively. Based on morphological variables, recommended rate of an NPK compound fertilizer 15-15-15 was in the range of 396.05 g per seedling for eight months. Recommended NPK were 7.00, 12.59, 37.58, 56.41, 36.74, 87.00, 86.60, and 72.97 g per seedling for first to eighth months, respectively.
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PEMANFAATAN BIOCHAR CANGKANG KELAPA SAWIT SEBAGAI SUBSTITUSI PUPUK NPK DALAM PENINGKATAN KUALITAS LAHAN PERTANIAN UTILIZING BIOCHAR PALM OIL SHELLS AS SUBSTITUTION OF NPK FERTILIZER IN IMPROVING SOIL QUALITY OF AGRICULTURE

PEMANFAATAN BIOCHAR CANGKANG KELAPA SAWIT SEBAGAI SUBSTITUSI PUPUK NPK DALAM PENINGKATAN KUALITAS LAHAN PERTANIAN UTILIZING BIOCHAR PALM OIL SHELLS AS SUBSTITUTION OF NPK FERTILIZER IN IMPROVING SOIL QUALITY OF AGRICULTURE

Food is the most essential basic human need for a country's population. Therefore, the State must carry out food sovereignty and seek the fulfillment of food needs for the population. However, in the application of the concept has not been implemented properly, especially concerning in terms of sustainable agriculture system sustainable. The difficult cause of reaching this food sovereignty is the increasing of land which its quality decrease as result of activity in agriculture cultivation intensively. One of the innovations to deal with the problem is to combine the use of artificial fertilizer with organic fertilizer from waste palm shells converted into biochar with NPK fertilizer to meet the nutrient deficiency in agricultural land and increased production. Biochar is considered to be a bioamelioran carrier with an aggregate ingredient active ingredient. Bio-char has an advantage in terms of total pore space and higher available water capacity. In its application to corn plant growth, The best growth of maize on Ultisol soils is obtained from the treatment of 100% single NPK fertilizer combined with 4.2 g of bioamelioran / plant. Meanwhile, a 100% single dose of NPK fertilizer combined with 2.1 g of bioamelioran / plant (112 kg/ha) resulted in higher dry corn kiln weights (+15.7%) when compared with 100% treatment of NPK fertilizer single course. The result is able to reduce the expenditure of farmers and able to improve the welfare of farmers Keyword: biochar, food sovereignty
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Keywords: Ethrel, NPK fertilizer, Production, Melon ABSTRAK - Uji Penggunaan Ethrel Dan Pupuk Npk Terhadap Produksi Melon (Cucumis Melo. L)

Keywords: Ethrel, NPK fertilizer, Production, Melon ABSTRAK - Uji Penggunaan Ethrel Dan Pupuk Npk Terhadap Produksi Melon (Cucumis Melo. L)

The aim of this research was to know the effect of ethrel and NPK fertilizer application interactionally and individually on production of Melon. The research used completely randomized design which consisted of 2 factors. The R factor (using ethrel) consisted of 4 levels and N (using NPK fertilizer) was also 4 levels with three replications and the total was 48 plots. The observated parameters were flowering age, harvested age, circle fruit, fruit weight, production per plot, and fruit taste quality. The observation data for each treatment was analyzed statistically and was done advanced different test with 5% significant level. Interactionally, the ethrel and NPK applications had only a significant effect on circle fruit with the best treatment of R2N1 (ethrel concentration of 5 cc/l and NPK of 10 g/plant). The ethrel application had only a significant effect on flowering age, harvested age, and fruit weight with the best treatment of R2 (5 cc/l). NPK application only affected significantly on flowering age and fruit weight with the best treatment of N1 (10 g/plant).
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STATUS KANDUNGAN RESIDU PUPUK NPK (PHONSKA) PADA PERLAKUAN DOSIS PUPUK YANG BERBEDA PADA TANAMAN TOMAT (Solanum lycopersicum var: servo F1) DI ENTISOL LOMBOK UTARA STATUS OF NPK FERTILIZER RESIDUE CONTENT (PHONSKA) IN DEFFERENT FERTILIZER DOSAGE TREATMENT

STATUS KANDUNGAN RESIDU PUPUK NPK (PHONSKA) PADA PERLAKUAN DOSIS PUPUK YANG BERBEDA PADA TANAMAN TOMAT (Solanum lycopersicum var: servo F1) DI ENTISOL LOMBOK UTARA STATUS OF NPK FERTILIZER RESIDUE CONTENT (PHONSKA) IN DEFFERENT FERTILIZER DOSAGE TREATMENT

Grafik peningkatan kandungan K tanah (Gambar 3) menunjukkan tingkat perubahan kadar K di dalam tanah. perubahan tertinggi terdapat pada perlakuan N21. Dari semua perlakuan perubahan kadar K tertinggi terdapat pada perlakuan berbagai dosis pupuk NPK dengan penambahan pupuk cair organik Bio-Extrim. Tingginya kadar K tanah dipengaruhi juga oleh sedikitnya pencucian hara yang terjadi karena tingkat curah hujan yang rendah di lokasi penelitian.

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Efek Populasi Cacing Eisenia foetida Savigny, Kapur dan Pupuk NPK terhadap Aspek Kualitas Nutrisi dan Produktivitas Centrosema pubescens Benth pada Latosol Dramaga.

Efek Populasi Cacing Eisenia foetida Savigny, Kapur dan Pupuk NPK terhadap Aspek Kualitas Nutrisi dan Produktivitas Centrosema pubescens Benth pada Latosol Dramaga.

Feed is one of important role on a farm, exspecially for livestock because its help animal to grow and make good performance. This research aimed to determine and to compare the effect of E. foetida population, lime and NPK fertilizer levels for nutrient quality and productivity of C. pubescens on Latosol Dramaga soil. The design of the experiment was Complete Randomized Design (CRD) with factorial pattern (2 x 2 x 3) and three replications. Factor 1 was level of NPK, factor 2 was level of lime and factor 3 was level of E. foetida population. The data were analyzed by using SAS version 9.0. The results showed that it was not significant on productivity (P>0.05) but it was significant on nutrient quality (P<0.05). C. pubescens had highest crude protein affected by lime, NPK factor and interaction between three factors. Calsium was significantly affected by lime, E. foetida population and interaction between three factors.
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SOYBEAN (Glycine max [L.] Merr.) SEED VIABILITY TESTING RESULT OF NPK SUPPLEMENT FERTILIZER ON 5 MONTH SEED AGE

SOYBEAN (Glycine max [L.] Merr.) SEED VIABILITY TESTING RESULT OF NPK SUPPLEMENT FERTILIZER ON 5 MONTH SEED AGE

using histograms and standard deviation. The results showed that the viability of soybean seed varieties Grobogan on five months storage age generally have shown a decreased of seed viability. Dissolve NPK fertilizer application better then the crushed NPK fertilizer application in maintaining seed viability based on all variables; germination, germination speed, simultaneity of germination, seedling dry weight, normal hypocotyl seedling length, and electrical

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Choosing Bio Ethanol Fermentation Process Combination with Two Levels Full Factorial Design Method

Choosing Bio Ethanol Fermentation Process Combination with Two Levels Full Factorial Design Method

Abstract: The reduction of oil energy reserve makes fuel increased in price. Therefore, alternative energy as a substitute to save fuel is needed. One of the alternative energy is bio fuel, and one of the bio fuel types is bio ethanol. The purpose of this research is to determine the best factors and level combination on bio ethanol fermentation process, in order to made bio ethanol with higher content. Cassava is used as the raw material of bio ethanol making process. This research was conducted using Two Levels Full Factorial Design method. Factors which are studied are the amount of urea fertilizer NPK (fertilizer) type, the amount of NPK, the amount of yeast, the amount of alpha amylase enzyme, and the amount of glucoamylase enzyme. Data was analyzed using ANOVA test, main effect plot, and interaction effect plot. As a result, type of NPK, amount of NPK, amount of alpha amylase enzyme, and amount of glucoamylase enzyme are factors that have a significant effect on the bio ethanol fermentation process. The best combination for this experiment is the amount of urea: 4.88 grams, type of NPK: 20/9/15, the amount of NPK: 1.4 gram, the amount of yeast 10 grams, the amount of alpha-amylase enzyme: 1.5 milliliter, and the amount of glucoamylase enzyme: 1.35 milliliter.
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MAPPING OF NPK IN SOIL FOR PRECISION AGRICULTURE APPLICATION ON RICE PLANT - Eprints UPN "Veteran" Yogyakarta

MAPPING OF NPK IN SOIL FOR PRECISION AGRICULTURE APPLICATION ON RICE PLANT - Eprints UPN "Veteran" Yogyakarta

According to the guide book of PUTS, soil sampling conducted in a single composite of 5-8 samples represented to 3-5 ha of paddy fields that were more or less uniform. In this study soil samples were taken and tested singly represent a narrow unit area by dividing the area of 3000 m2 paddy field into 50 plots. Each plot was 10 x 6 m. Soil samples were taken from each plot prior rice planting. Plots locations were depicted on a map of the scale 1: 500. NPK soil test results in each plot were included in the map so the nutrient status will be displayed. This map is then used as a reference in estimating the needs of NPK fertilizer on any plots as recommended by Soil Research Institute.
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this PDF file The Effect of Good Agriculture Practices (GAP) on Soybean Productivity with CobbDouglas Production Function Analysis in Kulon Progo Regency | Purnamasari | Agro Ekonomi 2 PB

this PDF file The Effect of Good Agriculture Practices (GAP) on Soybean Productivity with CobbDouglas Production Function Analysis in Kulon Progo Regency | Purnamasari | Agro Ekonomi 2 PB

The maximum dose of NPK is 200 kg/ha which is applied 2 times, 100 kg of basic fertilizer is given at the time of planting and 100 kg of fertilizer is given 20 days after planting. The average of NPK fertilizer used by farmer is 105.91 kg/ha. The addition of NPK fertilizer would reduce soybean productivityif it has reached maximum usage. This is according to research by Ernawanto (2012) which states that plant height affected by NPK fertilization/ Phonska at the age of 30 days or 60 days, but the addition of fertilizer above 100 kg/ ha had no signiicant to height. It is the same with NPK/ Phonska fertilizer that can increase soybean seeds production but the addition of fertilizer above 75kg/ ha will not show difference towards productivity. Fertilizer will increase of productivity if the fertilizer is already proper for its variety, dose, time, and the way of fertilization.
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INCREASING RICE PRODUCTION BY LEGUMES SUBSTITUTING ON CROP ROTATION AND ORGANIC FERTILIZER TO DEVELOP AGROTOURISM - Eprints UPN "Veteran" Yogyakarta

INCREASING RICE PRODUCTION BY LEGUMES SUBSTITUTING ON CROP ROTATION AND ORGANIC FERTILIZER TO DEVELOP AGROTOURISM - Eprints UPN "Veteran" Yogyakarta

Organic agriculture is a holistic system of agricultural production and integrated, which optimize health and productivity of agro-ecosystems in nature. Experiment for crop rotation consisted of three planting seasons done at Bener Village, Ngrampal District, Sragen Regency, began in June 2005 until July 2006. The treatment of field experiment in 1st planting season was using single factor arranged in Randomized Complete Block Design, repeated three times. This experiment consisted of 3 treatments, i.e. rice, soybean and groundnut. The experiment in 2nd planting season was continued to 3rd planting season using Split Plot treatment, and three replications. Main plot was residual from legumes/paddy in the first experiment with three treatments: straw, peanuts and soybean. Sub plot was combining organic+NPK fertilizer with the seventh treatments: Organic fertilizer and recommended rate NPK, Organic fertilizer and optimum rate NPK, Organic fertilizer and farmer rate NPK, recommended rate NPK, optimum rate NPK, farmer rate NPK, with no fertilizer.
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Levels on Cocoa (Theobroma cacao L.) Beans Quality Produced by Cocoa Farmers in the Teluk Kedondong Bayur Samarinda) Marwati, Hadi Suprapto,Yulianti

Levels on Cocoa (Theobroma cacao L.) Beans Quality Produced by Cocoa Farmers in the Teluk Kedondong Bayur Samarinda) Marwati, Hadi Suprapto,Yulianti

Soybean is an important food commodity after rice and maize in Indonesian human diet because of its high protein content. Application of organic and inorganic fertilizers can improve soil textures and increase crop productivity. Two kinds of organic fertilizers, Tithoganic and Beta, were applied to evaluate the effect on yield and quality of soybean grown on peaty acid sulphate land. Single field experiment using soybean variety of Anjasmoro arranged in completely randomized design was conducted in the Lamunti village, Central Kalimantan, during May-August 2009. The two organic fertilizers were applied with combination of NPK with dosage of 1, ¾, and ½. Treatment using full inorganic fertilizer was used as control. Parameters observed were number of pods per plant, weight of 100 seed, seed density, protein and fat content. The result showed that applicaion of NPK fertilizer combined with the organic matters increased some of parameters. Application of Beta combined with ¾ dosage of NPK fertilizer and Tithoganic combined with ½ dosage of NPK gave significant influence in number of seed per plant, seed weight per plant, weight of 100 seed, seed density, and the yield. Combination ¾ dosage of NPK with Beta and Tithoganic increased weight of 100 seed of 11.02 % and 14.33 %, respectively. While combination of ½ dosage of NPK with Beta and Tithoganic improved the yield of 39.82 % and 43.72 %, respectively. The same effect was detected for protein content. Combination of ¾ dosage of NPK with Beta and ½ dosage of NPK with Tithoganic increased the soybean protein content of 75 % and 56.45 %, respectively. Keywords: NPK fertilizer, Tithoganic and Beta organic matter, soybean, quality
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PENGARUH DOSIS PUPUK KANDANG SAPI DAN PUPUK MAJEMUK NPK TERHADAP PERTUMBUHAN DAN HASIL TERONG UNGU (Solanum melongena L.)

PENGARUH DOSIS PUPUK KANDANG SAPI DAN PUPUK MAJEMUK NPK TERHADAP PERTUMBUHAN DAN HASIL TERONG UNGU (Solanum melongena L.)

Tabel 2. Pengaruh Dosis Pupuk Kandang Sapi, Dosis Pupuk Majemuk NPK dan Kombinasinya Terhadap Rata - rata Tinggi Tanaman, Umur 2, 4, dan 6 MST, (cm) ........................................................................................ 26 (Table 2. The Effect of Cow Manure, NPK Fertilizer Dosage and their Combination

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Optimizing Rates of NPK Compound and Calcium Fertilizer for the Growth of Oil Palm (Elaeis guineensis Jacq.) Seedling in Main Nursery.

Optimizing Rates of NPK Compound and Calcium Fertilizer for the Growth of Oil Palm (Elaeis guineensis Jacq.) Seedling in Main Nursery.

Hasil pengamatan menunjukkan bahwa secara umum, tidak terdapat pengaruh interaksi antara pupuk majemuk NPK dan pupuk kalsium terhadap peubah tanggap morfologi, kecuali pada tinggi bibit 3 BSP. Pupuk majemuk NPK secara nyata berpengaruh sejak umur 3 BSP. Menurut Nazari (2008) pupuk majemuk NPK dapat menyediakan unsur hara lengkap dan tersedia bagi bibit kelapa sawit setelah 3 bulan aplikasi pemupukan. Wu et al. (2008) menyatakan bahwa pupuk majemuk NPK bersifat slow release yaitu melepaskan hara N, P dan K perlahan sehingga tersedia lambat bagi tanaman. Pemberian NPK 15-15-15 menurut Jannah et al. (2012) dapat memberikan pengaruh terbaik pada tinggi tanaman, jumlah daun dan diameter batang bibit kelapa sawit umur 4, 5 dan 6 bulan di main nursery.
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Optimizing Rates of NPK Compound and Calcium Fertilizer for the Growth of Oil Palm (Elaeis guineensis Jacq) Seedling in Main Nursery

Optimizing Rates of NPK Compound and Calcium Fertilizer for the Growth of Oil Palm (Elaeis guineensis Jacq) Seedling in Main Nursery

Pemberian pupuk majemuk NPK (15:15:15) dan bulk blend urea menghasilkan kadar P, K, Ca dan Mg yang hampir sama baiknya di bagian tajuk maupun akar bibit kelapa sawit, sedangkan perlakuan Urea-gipsum menghasilkan kadar Ca dan Mg yang lebih tinggi di tajuk dengan konsentasi P dan K lebih rendah baik di tajuk maupun akar. Hal ini disebabkan sifat antagonis Ca dan Mg yang mempengaruhi ketersediaan K. Penyerapan K menurun dengan meningkatnya Ca dan Mg di dalam tanah. Dosis rendah pupuk majemuk disarankan untuk pembibitan kelapa sawit. Urea-gipsum merupakan formula terbaik karena dapat meningkatkan ketersediaan N tanah dan berpotensi sebagai sumber Ca bagi tanaman (Bah dan Rahman 2004).
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