scholarly journals Effects of Urease Inhibitor and Nitrification Inhibitor on the Nitrogen Losses, Physiological Activity, and Oil Palm Yield on Red-Yellow Podzolic

2019 ◽  
Vol 3 (3) ◽  
pp. 127
Author(s):  
Melisa Melisa ◽  
Eka Tarwaca Susila Putra ◽  
Eko Hanudin
Keyword(s):  
Oil Palm ◽  
Reductase Activity ◽  
Physiological Activity ◽  
Block Design ◽  
Nitrification Inhibitor ◽  
N Fertilizer ◽  
Fertilizer Efficiency ◽  
Urease Inhibitor ◽  
Single Factor ◽  
N Loss

Nitrogen (N) fertilizer efficiency can increase by adding N-(n-butyl) thiophosphoric triamide (NBPT) and N-(n-propyl) thiophosphoric triamide (NPPT) as urease inhibitor in urea fertilizer and adding 3,4-dimethyl pyrazole phosphate (DMPP) as nitrification inhibitor in ammonium sulfate (ZA) fertilizer. The research objectives were to examine the effectiveness of urease inhibitor (NBPT and NPPT) and nitrification inhibitor (DMPP) on the physiological activity and oil palm yield on red-yellow podzolic. Field experiment was done using a Randomized Complete Block Design (RCBD) of single factor and three replications as block. The single factor was nine fertilization treatments of urea with or without urease inhibitor, and ZA with or without nitrification inhibitor. The use of urease inhibitors decreases the amount of volatilization and N loss fertilizer. The higher dose of broadcasting N fertilizer (on the same type of fertilizer) resulted in the higher amount of N loss and volatilization. All fertilization treatments did not have any significant influence to the width and the length of opening stomata, nitrate reductase activity (NRA), N concentration in oil palm leaf, Oil Extraction Rate (OER), and Free Fatty Acid (FFA). Meanwhile, The oil palms at yellow red podzolic applied with urea 195 kg/ha combined with 0.12% of NBPT-NPPT resulting in higher fresh fruit bunch productivity.

scholarly journals The influence of urease and nitrification inhibitor on loss of N and oil palm harvest in peat

2020 ◽  
Vol 5 (2) ◽  
pp. 110
Author(s):  
Aldy Slamet Riyadi ◽  
Eka Tarwaca Susila Putra ◽  
Eko Hanudin
Keyword(s):  
Ammonium Sulfate ◽  
Oil Palm ◽  
Block Design ◽  
Research Result ◽  
Nitrification Inhibitor ◽  
N Fertilization ◽  
Single Factor ◽  
N Loss ◽  
Central Kalimantan ◽  
Industrial Oil

Oil palm is one of intensively planted in Indonesia, large-managed for industrial oil palm. This study aimed to know the influences of urease and nitrification inhibitor on loss of N and oil palm harvest in peat. The research was conducted at Sukamandang Village Coconut Plantation, Seruyan Tengah District, Seruyan Regency, Central Kalimantan Province. The research used a single factor of field experimental method with Randomized Completely Block Design (RCBD). Urea and ZA fertilizer were used in this study with the following treatment: N0= Without N, N1= Urea (195 kg.ha-1 N), N2= Urea + 0.12% NBPT-NPPT (195 kg.ha-1 N), N3= Urea (156 kg.ha-1 N), N4= Urea + 0.12% NBPT-NPPT (156 kg.ha-1 N), N5= Ammonium Sulfate (427 kg.ha-1 N), N6= Ammonium Sulfate + 0.8% DMPP (427 kg.ha-1 N), N7= Ammonium Sulfate (324 kg.ha-1 N), N8= Ammonium Sulfate + 0.8% DMPP (324 kg.ha-1 N). The research result indicated that the use of NBPT and DMPP inhibitors did not affect N levels in the leaves and the free fatty acids. Urea + NBPT treatment had no N loss for about 30%–50% which was lower than urea without N, whereas ammonium sulfate + DMPP had smaller N loss than all treatments without N fertilization. Fertilization using urea + NBPT and ammonium sulfate + DMPP increased the production of FFB and yield of oil palm.

scholarly journals Effects of NP-SR Fertilizer Composition and Water Logging on Soil Chemical Properties and N Fertilizer Efficiency in Paddy Field

2021 ◽  
Vol 9 (1) ◽  
pp. 10-19
Author(s):  
Tiara Kartika Sari ◽  
Muhammad Rif’an ◽  
Sakhidin Sakhidin
Keyword(s):  
Rice Yield ◽  
Block Design ◽  
Chemical Properties ◽  
N Fertilizer ◽  
Soil Chemical Properties ◽  
Nitrogen Efficiency ◽  
Fertilizer Efficiency ◽  
Randomized Complete Block Design ◽  
Two Factors ◽  
Food Commodity

Rice is the primary food commodity in Indonesia. To increase the rice production, urea fertilizer has been excessively used, specifically on marginal land. However, it has no desired effect on the plant’s Nitrogen uptake due to volatilization. Previous studies suggest the use of zeolite to be mixed with urea to reduce the volatilization rate. This study aimed to determine the effect of six NP-SR (Nitrogen Phosphorus Slow Release) fertilizer compositions (without NP-SR; 20.69-0; 19.7-5; 17.27-10; 15.9-15; and 18.94-20) on soil chemical properties, nitrogen efficiency, and paddy rice yield on Ultisols at three waterlogging levels (0.5 cm, 3 cm, and 5 cm). The study was an experiment arranged in a Randomized Complete Block Design (RCBD) consisting of two factors, which were waterlogging levels and NP-SR fertilizer compositions. The results showed that waterlogging treatments significantly affected soil chemical properties in the initial vegetative and harvest phases. It can be concluded that the treatment of flooding (up to 3 cm) and fertilizer (NP-SR of 15.90-15) application could significantly reduce the volatilization rate, increase the efficiency of N fertilizer, and increase rice yield.

Influence of different nitrogen inhibitors on maize yield

2021 ◽  
Author(s):  
Maria Heiling ◽  
Mahdi Shorafa ◽  
Rayehe Mirkhani ◽  
Elden Willems ◽  
Arsenio Toloza ◽  
...  
Keyword(s):  
Block Design ◽  
Nitrification Inhibitor ◽  
Maize Yield ◽  
N Fertilizer ◽  
Control Treatment ◽  
Nitrification Inhibitors ◽  
Stable Form ◽  
N Losses ◽  
N Fertilizers ◽  
Significant Difference

<p>Nitrogen (N) fertilizer management is challenging due to the many factors and have low N use efficiency (NUE). Heavy N losses from soil reduce plant yield and have negative impacts on the environment. Nitrogen processes inhibitors, such as urease and nitrification inhibitors (UI and NI), are chemical compounds which reduce urea hydrolysis and nitrification respectively. By coating ammonium based chemical fertilizers with N process inhibitors allows N to stay in a more stable form of ammonium (NH<sub>4</sub><sup>+</sup>) thus minimising N losses as well as improving NUE and consequently enhancing crop yield.</p><p>A field experiment was established at the Soil and Water Management and Crop Nutrition Laboratory (SWMCNL) in Seibersdorf, Austria to determine the effect of different N fertilizers coated with N process inhibitors on maize yield in summer 2020. The field site is characterised by a moderately shallow Chernozem soil with significant gravel content. Three combinations of N fertilizer (urea or NPK) with N process inhibitors (UI and/or NI)) were tested and compared with a control treatment (without N fertilizer) and a urea application without any inhibitor. All treatments received 60 kg ha<sup>-1</sup> P<sub>2</sub>O<sub>5</sub> and 146 kg ha<sup>-1</sup> K<sub>2</sub>O. The amount of N added to each treatment receiving N fertilizer was 120 kg N ha<sup>-1</sup>. The inhibitors used were (i) UI (2-NPT: N-(2-nitrophenyl) phosphoric acid triamide), (ii) NI-1 (MPA: N-[3(5)-methyl-1H-pyrazol-1-yl) methyl] acetamide), and (iii) NI-2 (DMPP: 3,4-dimethylpyrazole phosphate). DMPP, a nitrification inhibitor, was used in combination with NPK fertilizer. A randomized complete block design with four replications was used in this study. Treatments were: T<sub>1</sub> (control treatment - without N fertilizer), T<sub>2</sub> (Urea only), T<sub>3</sub> (Urea + UI), T<sub>4</sub> (Urea + UI + NI-1), and T<sub>5 </sub>(NPK + NI-2). Urea was applied through two split applications in the T<sub>2</sub> treatment. In T<sub>3</sub>, T<sub>4</sub>, and T<sub>5</sub> treatments, N fertilizers were applied only once. Supplemental irrigation was only applied in the early stages of growth, to ensure that the crop could establish. Harvest was carried out at 98 days after planting.</p><p>The yield data showed that different fertilizer treatments had a significant (p ≤ 0.01) effect on maize yield (dry matter production). There was no significant difference between treatments 4 and 5, which had the highest yield followed by treatments 2 and 3. The comparison between T<sub>2</sub> and T<sub>3</sub> showed that the application of a urease inhibitor avoids the need for a split application of urea, which decreases labour costs. Adding NI-1 (under T<sub>4</sub>) further increases the yield. Also, the package of NPK, a common choice by farmers in Austria, in combination with the nitrification inhibitor NI-2 showed equally good results as urea combined with two inhibitors. Based on the yield results, it can be concluded that N process inhibitors play a significant role in enhancing maize yields.</p>

scholarly journals Seleksi Genotipe Jagung Hibrida Toleran N Rendah

2016 ◽  
Vol 19 (2) ◽  
pp. 73 ◽  
Author(s):  
NFN Syafrudin ◽  
Muhammad Azrai ◽  
NFN Suwarti
Keyword(s):  
Block Design ◽  
Land Development ◽  
N Fertilization ◽  
N Fertilizer ◽  
Fertilizer Efficiency ◽  
Index Number ◽  
Research Station ◽  
Maize Crop ◽  
High Productivity ◽  
Selection Of

<p>Maize Hybrid Genotypes Selection for Low N Tolerance. Syafruddin, Muhammad Azrai, and Suwarti. Most of the maize crop land development in Indonesia are defficient of N, to overcome these obstacles is generally done with N fertilizer. N fertilization beside increasing the cost of production is also causing environmental pollution. Therefore, fertilizer efficiency is required. One effort to reduce N fertilizer usage is the use of low N-tolerant genotypes. Selection of low Ntolerant maize hybrids are expected to found a low N genotypes with high productivity. The experiment was conducted in low land in May-August 2012 in the Bontobili Research Station, Gowa, South Sulawesi. A total of 32 genotypes including check entries were 4 known hybrid Bima- 2, Bima-3, Bima-4, and Bisi-2 were screened in normal rate of N application (200 kg N/ha) and low N (100 kg N/ha). The treatment used experimental randomized complete block design at each fertilization with three replications. To Determine of genotype x N interaction was used combine analysis. The result showed that in selection of tolerance genotypes for low N, beside yield as selection parameter we can also consider leaf chlorophyll, harvest index, number of kernel in ear and seed weight. Genotypes 1044-0 x 1027-11 and AMB07 x CML 161 were tolerance to low N and B11 x 11 is moderat to low N. Three of genotypes have yield equal to 4 check varieties (Bima-2, Bima-3, Bima-4, and Bisi-2).</p><p> </p><p><strong>Abstrak</strong></p><p>Sebagian besar lahan pengembangan tanaman jagung di Indonesia defisien N. Untuk mengatasi kendala tersebut umumnya dilakukan dengan pemupukan N. Pemupukan N di samping meningkatkan biaya produksi juga menyebabkan pencemaran lingkungan. Salah satu upaya untuk menekan penggunaan pupuk N adalah penggunaan genotipe yang toleran N rendah. Seleksi genotipe jagung hibrida diharapkan memperoleh genotipe toleran N rendah dengan produktivitas tetap tinggi. Penelitian dilaksanakan di lahan sawah pada Mei- Agustus 2012 di KP Bontobili, Gowa, Sulawesi Selatan. Sebanyak 32 genotipe termasuk empat pembanding Bima-2, Bima-3, Bima-4, dan Bisi-2 diuji pada takaran pupuk N normal (200 kg N/ha) dan N rendah (100 kg N/ha). Penelitian menggunakan rancangan kelompok pada masing-masing pemupukan dengan tiga ulangan. Untuk mengetahui interaksi antara genotipe dengan N dilakukan analisis gabungan. Hasil penelitian menunjukkan bahwa untuk mendapatkan genotipe jagung toleran N rendah yang akurat di samping mempertimbangkan hasil biji, juga mempertimbangkan komponen lainnya, seperti klorofil daun, indeks panen, jumlah biji per tongkol, dan bobot biji. Genotipe 1044-9 x 1027-11 dan AMB07 x CML161 toleran N rendah dan B11 x 11 moderat terhadap N rendah, ketiga genotipe tersebut mempunyai hasil biji setara dengan varietas pembanding Bima-2, Bima-3, Bima- 4, dan Bisi-2.</p>

scholarly journals THE GROWTH OF OIL PALM VARIETIES (ELAEIS GUINEENSIS JACQ.) ON SUBSOIL MEDIA TREATED WITHSEVERAL DOSAGES OF NITROGEN FERTILIZER

2018 ◽  
Vol 1 (2) ◽  
pp. 103
Author(s):  
Siti Khairani ◽  
Erwin Nyak Akoeb ◽  
Edy Sigit Sutarta ◽  
T. Sabrina
Keyword(s):  
Nitrogen Fertilizer ◽  
Oil Palm ◽  
Elaeis Guineensis ◽  
Block Design ◽  
Absorption Efficiency ◽  
N Fertilizer ◽  
Stem Diameter ◽  
Research Centre ◽  
Limiting Factor ◽  
Fertilizer Recommendation

AbstractOilpalmis one of important export commodities performing as the country’s main foreign exchange from the trade of crops.Nitrogen is a limiting factor of plant growth. This study aims to determine: 1) the appropriate dose of absorption of nitrogen and growth in some high yielding varieties of oil palm; 2) the superior varieties of oil palm crops that provide no effect from the nitrogen nutrients and; 3) the interaction between varieties and nitrogen fertilizer on nitrogen nutrient absorption efficiency. This research was conducted in Palm Oil Research Centre at the District of Deli Serdang, the Province of North Sumatra.The research used Factorial Random Block Design with 2 factors. The first factor is varieties (Avros 540, PPKS 239, Simalungun, Langkat and 718PPKS). The second factor is N fertilizer which consists of without N fertilizer, 25% fertilizer recommendation, 50% fertilizer recommendation, 75% fertilizer recommendation and 100% fertilizer recommendation. The results showed that the varieties of oil palm used have different characteristics on plant height, stem diameter and number of leaves. The Simalungun variety was the best variety and its combination with 100% recommendation N was the best result in increasing plant heightof oil palm. Meanwhile the combination with 50% recommendation N was the best result in increasing stem diameter and number of leavesof oil palm.Keywords: oilpalm, nitrogen fertilizer, variety

scholarly journals Penggunaan biostimulan Orgamin untuk efisiensi pemupukan dan peningkatan produktivitas kelapa sawit di dataran tinggi Application of Orgamin biostimulan to enhance fertilizer efficiency and productivity of oil palm grown in highland

2016 ◽  
Vol 81 (2) ◽  
Author(s):  
Happy WIDIASTUTI ◽  
Djoko SANTOSO ◽  
Soekarno Mismana PUTRA ◽  
Memed WIRAMIHARDJA ◽  
Aida FARIDA ◽  
...  
Keyword(s):  
Small Molecules ◽  
Growth Regulators ◽  
Oil Palm ◽  
Growth And Development ◽  
Oil Content ◽  
Block Design ◽  
Inorganic Fertilizer ◽  
Fertilizer Efficiency ◽  
Randomized Block Design ◽  
Efficiency And Productivity

AbstractThe extension of oil palm area has been expanded tomarginal land such as the highland regions. However, theproductivity of the oil palm became the main demand for theplanters. Increasing of oil palm productivity can be done byapplication of growth regulators. Growth regulators aresmall molecules in a relatively very small amount that affectthe growth and development of plant. This study wasconducted to asses the efectiveness of plant growth regu-lators (Orgamin and Orgamin plus) in improving fertilizerefficiency and productivity of mature oil palm (TM 7). Theexperiments were conducted at Marjandi oil palm plantationat an altitude of 700 m above sea level in a total area of 16 ha. Six treatments tested were 1). 100% inorganicfertilizer (control), 2). 50% inorganic fertilizer + Orgamin(50K+O), 3). 75% inorganic fertilizer + Orgamin (75K+O),4). 50% inorganic fertilizer + Orgamin plus (50K+OP), 5).75% inorganic fertilizer + Orgamin plus (75K+OP), and 6).100% inorganic fertilizer + Orgamin plus (100K+OP)arranged in a randomized block design (RBD) with threereplications. Orgamin (O) and Orgamin plus (OP) wereapplied in the hole around the oil palm along with inorganicfertilizers. The results showed that application of O and OPimproved the efficiency of inorganic fertilizers by 50% basedon vegetative variables and increased the concentration ofN, P, and K of leaf and soil compared to those of 100%inorganic fertilizer. In addition to the height and leaf numberof plant parameters, the leaf of the plant treated with O andOP showed more greenish compared to those of control.There is an indication that the O application increased thepercentage of female flowers. In addition the application ofOrgamin also produced the highest oil content in oil palmfruit particularly in the treatment of 75% of inorganicfertilizer + orgamin harvested in October compared to thosein March. Moreover, application of OP increased both thetotal weight and weight per bunch of FFB.AbstrakPengembangan kelapa sawit mengharuskan pengguna-an lahan suboptimal seperti daerah dataran tinggi. Produk-tivitas kelapa sawit menjadi tuntutan utama bagi pekebun.Peningkatan produktivitas kelapa sawit di dataran tinggididuga dapat dilakukan dengan aplikasi zat pengatur tumbuh.Zat pengatur tumbuh merupakan molekul “kecil” (small molecules) yang dalam jumlah relatif sangat sedikit mem-pengaruhi pertumbuhan/perkembangan tanaman. Penelitiandilakukan untuk menguji formula zat pengatur tumbuh(Orgamin dan Orgamin plus) dalam meningkatkan efisiensipemupukan dan produktivitas kelapa sawit TM 7. Percobaandilakukan di kebun Marjandi dengan ketinggian 700 dpl padaareal seluas 16 ha. Enam perlakuan yang diuji adalah 1).pupuk anorganik 100% (100K), 2). pupuk anorganik 50% +Orgamin (50K+O), 3). pupuk anorganik 75% + Orgamin(75K+O), 4). pupuk anorganik 50% + Orgamin plus (50K+OP), 5). pupuk anorganik 75% + Orgamin plus (75K+OP),dan 6). pupuk anorganik 100% + Orgamin plus (100K+OP)yang disusun dalam rancangan acak kelompok (RAK)dengan tiga ulangan. Orgamin (O) dan Orgamin plus (OP)diberikan dalam lubang di piringan pokok bersamaan denganpupuk anorganik. Hasil pengamatan menunjukkan bahwapemberian O dan OP dapat meningkatkan efisiensi pemupuk-an anorganik hingga 50% dilihat dari beberapa peubahvegetatif dan menghasilkan kadar N, P, dan K daun dantanah lebih tinggi dibandingkan dengan pemberian pupukanorganik 100%. Selain pada parameter tinggi tanaman danjumlah daun, peningkatan juga terlihat pada tingkatkehijauan daun. Terdapat indikasi bahwa pemberian Orgaminmeningkatkan persentase jumlah bunga betina. PemberianOrgamin juga menghasilkan kadar minyak tertinggi khusus-nya pada pemberian Orgamin + pupuk anorganik 75% padabuah yang dipanen bulan Oktober dibandingkan dengan buahyang dipanen bulan Maret. Baik data bobot per tandanmaupun bobot TBS menunjukkan bahwa pemberian OPdapat meningkatkan kedua peubah tersebut. 

scholarly journals The Effect of Urease Inhibitors Coated Urea on the Growth, Physiological Activities and Yield of Maize (Zea mays L.) in Inceptisol Jogonalan, Klaten

2019 ◽  
Vol 3 (3) ◽  
pp. 160
Author(s):  
Fransisca Christiana Dewi ◽  
Eka Tarwaca Susila Putra ◽  
Cahyo Wulandari
Keyword(s):  
Seed Weight ◽  
Physiological Activity ◽  
Block Design ◽  
Physicochemical Characteristics ◽  
Growth And Yield ◽  
Yield Potential ◽  
Urease Inhibitors ◽  
Urease Inhibitor ◽  
Optimum Result ◽  
Coated Urea

An approach to minimize the loss of nitrogen (N) evaporating from urea is by inhibiting urease activity by urea coating with N- (n-butyl) thiophosphoric triamide (NBPT) and N- (n-propyl) thiophosphoric triamide (NPPT). The effect of urease inhibitor to minimize N loss has not been done in inceptisol soil. The purpose of this study was to study the effect of urease inhibitor coated urea on growth, physiological activity and yield of maize in Inceptisol Jogonalan, Klaten, Indonesia. The treatment was laid out in a Randomized Complete Block Design with 4 replications namely N0 (without fertilizer), N1 (urea + NBPT 348 kg ha-1) and N2 (urea + NBPT 278 kg ha-1). All treated plants was fertilized once in one growing season 3 weeks after planting (WAP). Observations were done on several variables: soil physicochemical characteristics, plant physiological activity as well as growth and yield of maize. Data were analyzed using Analysis of Variance (ANOVA), and then the mean comparisons were done by using Least Significance Difference (LSD) test at 5%. The results showed that fertilization affected all observed variables. The effect of urea-coated urea inhibitor urease (NBPT+NPPT) compared with N0 (control) showed very optimum result, especially in N2 treatment. The urea coated with NBPT + NPPT (urease inhibitors) was more effective at lower dose of 278 kg ha-1 and tended to provide better results indicated by the growth and yield of maize in Inceptisol, Jogonalan, Klaten. The better growth as well as the higher yield of maize that was indicated by seed weight of 11,45 tons ha-1 and 100-seed weight of 37.75 g were obtained from N2 treatment as compared to other treatments. The hybrid maize (P35) has an optimum yield potential of 12.1 tons of dry pipes per hectare.

scholarly journals Penggunaan biostimulan Orgamin untuk efisiensi pemupukan dan peningkatan produktivitas kelapa sawit di dataran tinggi Application of Orgamin biostimulan to enhance fertilizer efficiency and productivity of oil palm grown in highland

2016 ◽  
Vol 81 (2) ◽  
Author(s):  
Happy WIDIASTUTI ◽  
Djoko SANTOSO ◽  
Soekarno Mismana PUTRA ◽  
Memed WIRAMIHARDJA ◽  
Aida FARIDA ◽  
...  
Keyword(s):  
Small Molecules ◽  
Growth Regulators ◽  
Oil Palm ◽  
Growth And Development ◽  
Oil Content ◽  
Block Design ◽  
Inorganic Fertilizer ◽  
Fertilizer Efficiency ◽  
Randomized Block Design ◽  
Efficiency And Productivity

AbstractThe extension of oil palm area has been expanded tomarginal land such as the highland regions. However, theproductivity of the oil palm became the main demand for theplanters. Increasing of oil palm productivity can be done byapplication of growth regulators. Growth regulators aresmall molecules in a relatively very small amount that affectthe growth and development of plant. This study wasconducted to asses the efectiveness of plant growth regu-lators (Orgamin and Orgamin plus) in improving fertilizerefficiency and productivity of mature oil palm (TM 7). Theexperiments were conducted at Marjandi oil palm plantationat an altitude of 700 m above sea level in a total area of 16 ha. Six treatments tested were 1). 100% inorganicfertilizer (control), 2). 50% inorganic fertilizer + Orgamin(50K+O), 3). 75% inorganic fertilizer + Orgamin (75K+O),4). 50% inorganic fertilizer + Orgamin plus (50K+OP), 5).75% inorganic fertilizer + Orgamin plus (75K+OP), and 6).100% inorganic fertilizer + Orgamin plus (100K+OP)arranged in a randomized block design (RBD) with threereplications. Orgamin (O) and Orgamin plus (OP) wereapplied in the hole around the oil palm along with inorganicfertilizers. The results showed that application of O and OPimproved the efficiency of inorganic fertilizers by 50% basedon vegetative variables and increased the concentration ofN, P, and K of leaf and soil compared to those of 100%inorganic fertilizer. In addition to the height and leaf numberof plant parameters, the leaf of the plant treated with O andOP showed more greenish compared to those of control.There is an indication that the O application increased thepercentage of female flowers. In addition the application ofOrgamin also produced the highest oil content in oil palmfruit particularly in the treatment of 75% of inorganicfertilizer + orgamin harvested in October compared to thosein March. Moreover, application of OP increased both thetotal weight and weight per bunch of FFB.AbstrakPengembangan kelapa sawit mengharuskan pengguna-an lahan suboptimal seperti daerah dataran tinggi. Produk-tivitas kelapa sawit menjadi tuntutan utama bagi pekebun.Peningkatan produktivitas kelapa sawit di dataran tinggididuga dapat dilakukan dengan aplikasi zat pengatur tumbuh.Zat pengatur tumbuh merupakan molekul “kecil” (small molecules) yang dalam jumlah relatif sangat sedikit mem-pengaruhi pertumbuhan/perkembangan tanaman. Penelitiandilakukan untuk menguji formula zat pengatur tumbuh(Orgamin dan Orgamin plus) dalam meningkatkan efisiensipemupukan dan produktivitas kelapa sawit TM 7. Percobaandilakukan di kebun Marjandi dengan ketinggian 700 dpl padaareal seluas 16 ha. Enam perlakuan yang diuji adalah 1).pupuk anorganik 100% (100K), 2). pupuk anorganik 50% +Orgamin (50K+O), 3). pupuk anorganik 75% + Orgamin(75K+O), 4). pupuk anorganik 50% + Orgamin plus (50K+OP), 5). pupuk anorganik 75% + Orgamin plus (75K+OP),dan 6). pupuk anorganik 100% + Orgamin plus (100K+OP)yang disusun dalam rancangan acak kelompok (RAK)dengan tiga ulangan. Orgamin (O) dan Orgamin plus (OP)diberikan dalam lubang di piringan pokok bersamaan denganpupuk anorganik. Hasil pengamatan menunjukkan bahwapemberian O dan OP dapat meningkatkan efisiensi pemupuk-an anorganik hingga 50% dilihat dari beberapa peubahvegetatif dan menghasilkan kadar N, P, dan K daun dantanah lebih tinggi dibandingkan dengan pemberian pupukanorganik 100%. Selain pada parameter tinggi tanaman danjumlah daun, peningkatan juga terlihat pada tingkatkehijauan daun. Terdapat indikasi bahwa pemberian Orgaminmeningkatkan persentase jumlah bunga betina. PemberianOrgamin juga menghasilkan kadar minyak tertinggi khusus-nya pada pemberian Orgamin + pupuk anorganik 75% padabuah yang dipanen bulan Oktober dibandingkan dengan buahyang dipanen bulan Maret. Baik data bobot per tandanmaupun bobot TBS menunjukkan bahwa pemberian OPdapat meningkatkan kedua peubah tersebut. 

scholarly journals Penentuan Waktu Pemisahan Bibit Kembar Kelapa Sawit (Elaeis guineensis Jacq.) Asal Benih Multi Embrio di Pembibitan

2017 ◽  
Vol 17 (2) ◽  
Author(s):  
Yan Sukmawan
Keyword(s):  
Oil Palm ◽  
Elaeis Guineensis ◽  
Block Design ◽  
General Linear Model ◽  
Single Factor ◽  
General Linear Model Analysis ◽  
Randomized Block Design ◽  
Result Show ◽  
Elaeis Guineensis Jacq ◽  
Single Factor Experiment

The oil palm (Elaeis guineensis Jacq.) seed generally in form of germinated seed. Germinated seed purchased from oil palm seed producers often contained twin seedlings. The twin seedlings must be separated in pre-nursery before transplanted to the main-nursery. The aim of this research was to determine the best time of oil palm twin seedlings separation in nursery. The research was conducted on April to November 2016 in Politeknik Negeri Lampung. Single-factor experiment was arranged in randomized block design with three replications. The treatment was the age of twin seedling i.e.: 8 weeks after sowing (W1), 9 weeks after sowing (W2), 10 weeks after sowing (W3) and 11 weeks after sowing (W4). The data were analysed by general linear model analysis of variance (ANOVA). The means were separated using HSD at α=5% level. The result show the best time to separate the twin seedling in pre-nurserys is 9-11 weeks after sowing. Keywords: main-nursery, multi embryo, pre-nursery, twin seedlings

scholarly journals Biochar and urease inhibitor mitigate NH3 and N2O emissions and improve wheat yield in a urea fertilized alkaline soil

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Khadim Dawar ◽  
Shah Fahad ◽  
M. M. R. Jahangir ◽  
Iqbal Munir ◽  
Syed Sartaj Alam ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Grain Yield ◽  
Block Design ◽  
N Uptake ◽  
Nitrous Oxide Emissions ◽  
N2o Emissions ◽  
Urease Inhibitor ◽  
Alkaline Soil ◽  
Total N ◽  
N Assimilation

AbstractIn this study, we explored the role of biochar (BC) and/or urease inhibitor (UI) in mitigating ammonia (NH3) and nitrous oxide (N2O) discharge from urea fertilized wheat cultivated fields in Pakistan (34.01°N, 71.71°E). The experiment included five treatments [control, urea (150 kg N ha−1), BC (10 Mg ha−1), urea + BC and urea + BC + UI (1 L ton−1)], which were all repeated four times and were carried out in a randomized complete block design. Urea supplementation along with BC and BC + UI reduced soil NH3 emissions by 27% and 69%, respectively, compared to sole urea application. Nitrous oxide emissions from urea fertilized plots were also reduced by 24% and 53% applying BC and BC + UI, respectively, compared to urea alone. Application of BC with urea improved the grain yield, shoot biomass, and total N uptake of wheat by 13%, 24%, and 12%, respectively, compared to urea alone. Moreover, UI further promoted biomass and grain yield, and N assimilation in wheat by 38%, 22% and 27%, respectively, over sole urea application. In conclusion, application of BC and/or UI can mitigate NH3 and N2O emissions from urea fertilized soil, improve N use efficiency (NUE) and overall crop productivity.

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