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The influence of urease and nitrification inhibitor on loss of N and oil palm harvest in peat Riyadi, Aldy Slamet; Putra, Eka Tarwaca Susila; Hanudin, Eko
Jurnal Ilmu Pertanian Vol 5, No 2 (2020): August
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

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-1Â 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%â€“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.

Evaluation of drought-tolerance in some tropical wheat genotypes (Triticum aestivum L.) at different osmotic-stress levels Muhammad Kadir; Kaimuddin Kaimuddin; Yunus Musa; Muh Farid Badaruddin; Amin Nur
Jurnal Ilmu Pertanian Vol 5, No 2 (2020): August
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Abiotic factors, such as temperature and drought, were the main factors limiting the cultivation under the tropical condition. Two-stage experiments were conducted to examine the drought-tolerant potential of some wheat genotypes against the osmotic stress under the tropical condition at the Laboratory and Greenhouse of Hasanuddin University and Indonesian Cereal Research Institute. The experiments were arranged in a randomized block design with the split-plot pattern and respectively provided with four and three replications. The main plot was potential osmotic stress (0, -0. 33 , and -0.67 MPa) and the sub-plot was selected wheat genotypes (17 genotypes). The results indicated that based on the germination percentage, shoot/root ratio, proline content, stomatal behavior, and relative water content, the wheat lines of O/HP-78-A22-3-7, WBLL*2KURUKU, O/HP-6-A8-2-10, and O/HP-22-A27-1-10 were identified to have better drought-tolerance than the others genotypes based on the analysis of responses to parameters observed. The positively adaptive response of some tropical wheat genotypes to drought stress may be used as a potential donor for further development of drought-tolerant wheat varieties under the tropical climate in Indonesia.

Evaluation of drought-tolerance in some tropical wheat genotypes (Triticum aestivum L.) at different osmotic-stress levels Nur, Amin; Kadir, Muhammad; Kaimuddin, Kaimuddin; Musa, Yunus; Badaruddin, Muh Farid
Jurnal Ilmu Pertanian Vol 5, No 2 (2020): August
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Abiotic factors, such as temperature and drought, were the main factors limiting the cultivation under the tropical condition. Two-stage experiments were conducted to examine the drought-tolerant potential of some wheat genotypes against the osmotic stress under the tropical condition at the Laboratory and Greenhouse of Hasanuddin University and Indonesian Cereal Research Institute. The experiments were arranged in a randomized block design with the split-plot pattern and respectively provided with four and three replications. The main plot was potential osmotic stress (0, -0. 33 , and -0.67 MPa) and the sub-plot was selected wheat genotypes (17 genotypes). The results indicated that based on the germination percentage, shoot/root ratio, proline content, stomatal behavior, and relative water content, the wheat lines of O/HP-78-A22-3-7, WBLL*2KURUKU, O/HP-6-A8-2-10, and O/HP-22-A27-1-10 were identified to have better drought-tolerance than the others genotypes based on the analysis of responses to parameters observed. The positively adaptive response of some tropical wheat genotypes to drought stress may be used as a potential donor for further development of drought-tolerant wheat varieties under the tropical climate in Indonesia.Â

Effects of water flow rate and surface cover plant density on the growth of duckweed (Lemna minor L.) Renata Caprina Samantha Mahadewi Hutabarat; Didik Indradewa
Jurnal Ilmu Pertanian Vol 5, No 2 (2020): August
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Globally, agriculture sector is facing unprecedented challenges in producing fertilizers and increasing the amount of fertilizer production without having negative impact on the environment. Thus, the organic fertilizers are needed to be produced as they do not give any damages to the environment. Duckweed plant has a lot of potentials that can be used in the agriculture sector. This plant can breed in approximately 16-48 hours by splitting. The water needs and its breeding speed ability are the basis for conducting this research. The research objective was to determine the effect of water flow rate and surface cover plant density on the growth and yield of duckweed plants. This research was conducted in November–December 2018 in Cangkringan District, Sleman, Special Region of Yogyakarta, Indonesia. The experiment was arranged in a split plot design. The main plot was irrigation water flow rate, consisting of two levels, namely large water flow rate (0.336 L.second-1) and small water flow rate (0.085 L.second-1). The subplot was the density of the duckweed plant surface cover, consisting of 10%, 20%, 40% and 60%. The results of this study indicated there was no effect of water flow rate on the plant growth, yield, and yield quality of duckweed plants. The C/N ratio of the duckweed plants fulfilled the requirement to be used as green manure.

Effects of water flow rate and surface cover plant density on the growth of duckweed (Lemna minor L.) Hutabarat, Renata Caprina Samantha Mahadewi; Indradewa, Didik
Jurnal Ilmu Pertanian Vol 5, No 2 (2020): August
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Globally, agriculture sector is facing unprecedented challenges in producing fertilizers and increasing the amount of fertilizer production without having negative impact on the environment. Thus, the organic fertilizers are needed to be produced as they do not give any damages to the environment. Duckweed plant has a lot of potentials that can be used in the agriculture sector. This plant can breed in approximately 16-48 hours by splitting. The water needs and its breeding speed ability are the basis for conducting this research. The research objective was to determine the effect of water flow rate and surface cover plant density on the growth and yield of duckweed plants. This research was conducted in Novemberâ€“December 2018 in Cangkringan District, Sleman, Special Region of Yogyakarta, Indonesia. The experiment was arranged in a split plot design. The main plot was irrigation water flow rate, consisting of two levels, namely large water flow rate (0.336 L.second-1) and small water flow rate (0.085 L.second-1). The subplot was the density of the duckweed plant surface cover, consisting of 10%, 20%, 40% and 60%. The results of this study indicated there was no effect of water flow rate on the plant growth, yield, and yield quality of duckweed plants. The C/N ratio of the duckweed plants fulfilled the requirement to be used as green manure.

NPK uptake and growth of maize on ombrogenous peat as affected by the application of mycorrhizal fungal multi-spores and compound fertilizers Angga Ade Sahfitra; Eko Hanudin; Cahyo Wulandari; Sri Nuryani Hidayah Utami
Jurnal Ilmu Pertanian Vol 5, No 2 (2020): August
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

This study investigated the effectiveness of mycorrhizal fungal multi-spores and inorganic fertilizers in increasing NPK uptake and growth of maize on ombrogenous peat soils in Riau. The experiment, which was carried out in a plastic house, was arranged in a completely randomized design (CRD) with two factors, consisting of five replications. The first factor was the application of mycorrhizal fungal multi-spores, consisting of two levels (with and without application). The second factor was the application of inorganic fertilizer, consisting of three levels (P0: without fertilizer, PM-1: mixture of 225 kg Urea + 100 kg SP-36 + 75 kg KCl + 1000 kg Dolomite, and PM-2: mixture of 450 kg Urea + 200 kg SP-36 + 150 kg KCl +2000 kg Dolomite). Observed data consisted of agronomic observations, soil observations, and mycorrhiza observations. Agronomic observations consisted of plant height, root dry weight, shoot dry weight, and N, P, K nutrient uptake, and soil observations consisted of total and available N, P, K nutrients in the soil. Meanwhile, mycorrhiza observations consisted of infected roots and spore populations. The data obtained were then analyzed using DMRT to see the significant effect of the treatments. There was no interaction effect of mycorrhiza and compound fertilizer on the variables of shoot and root dry weight, but the interaction effect was observed on the variables of of shoot N, P, K uptake and root P and K uptake.

NPK uptake and growth of maize on ombrogenous peat as affected by the application of mycorrhizal fungal multi-spores and compound fertilizers Sahfitra, Angga Ade; Hanudin, Eko; Wulandari, Cahyo; Utami, Sri Nuryani Hidayah
Jurnal Ilmu Pertanian Vol 5, No 2 (2020): August
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

This study investigated the effectiveness of mycorrhizal fungal multi-spores and inorganic fertilizers in increasing NPK uptake and growth of maize on ombrogenous peat soils in Riau. The experiment, which was carried out in a plastic house, was arranged in a completely randomized design (CRD) with two factors, consisting of five replications. The first factor was the application of mycorrhizal fungal multi-spores, consisting of two levels (with and without application). The second factor was the application of inorganic fertilizer, consisting of three levels (P0: without fertilizer, PM-1: mixture of 225 kg Urea + 100 kg SP-36 + 75 kg KCl + 1000 kg Dolomite, and PM-2: mixture of 450 kg Urea + 200 kg SP-36 + 150 kg KCl +2000 kg Dolomite). Observed data consisted of agronomic observations, soil observations, and mycorrhiza observations. Agronomic observations consisted of plant height, root dry weight, shoot dry weight, and N, P, K nutrient uptake, and soil observations consisted of total and available N, P, K nutrients in the soil. Meanwhile, mycorrhiza observations consisted of infected roots and spore populations. The data obtained were then analyzed using DMRT to see the significant effect of the treatments. There was no interaction effect of mycorrhiza and compound fertilizer on the variables of shoot and root dry weight, but the interaction effect was observed on the variables of of shoot N, P, K uptake and root P and K uptake. Â

Morphological characters of root and yield of three cocoa (Theobroma cacao L.) clones in the field with dead-end trench Canggih Nailil Maghfiroh; Eka Tarwaca Susila Putra
Jurnal Ilmu Pertanian Vol 5, No 2 (2020): August
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Cocoa (Theobroma cacao L.) is a perennial crop originated from tropical regions, divided into Criollo, Forastero, and Trinitario. Demand for cocoa has increased, but the productivity is still low. The increase in production could be achieved by improving crop management and using superior clones. RCC-70, RCC-71, and KKM-22 are recommended as the superior cocoa clones. Dead-end trench can reduce erosion and surface run-off as well as improve rooting and soil organic matter sequestration. The objectives of this research were to study the effects of dead-end trench application on morphological characters of roots and yields of three cocoa clones and to determine which cocoa clone(s) performed a signifificant yield increase with the application of dead-end trench. The research was conducted in August 2018–April 2019 at Pagilaran Ltd. cocoa plantation in North Segayung Production Unit, subdistrict Tulis, Batang, Central Java. The experiment was arranged in a randomized complete block design with two factors and three replications as block. The first factor was dead-end trench application (with and without dead-end trench application) and the second factor was cocoa clones (RCC-70, RCC-71, and KKM-22). This study showed that application of dead-end trench and clones significantly increased root fresh weight, root dry weight, seed fresh weight, and seed dry weight, but had no significant effect on fruit diameter, fruit length, root length, and root surface area. RCC-70 clone, coupled with the application of dead-end trench, resulted in the highest seed dry weight compared to RCC-71 and KKM-22 clones.

Morphological characters of root and yield of three cocoa (Theobroma cacao L.) clones in the field with dead-end trench Maghfiroh, Canggih Nailil; Putra, Eka Tarwaca Susila
Jurnal Ilmu Pertanian Vol 5, No 2 (2020): August
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Cocoa (Theobroma cacao L.) is a perennial crop originated from tropical regions, divided into Criollo, Forastero, and Trinitario. Demand for cocoa has increased, but the productivity is still low. The increase in production could be achieved by improving crop management and using superior clones. RCC-70, RCC-71, and KKM-22 are recommended as the superior cocoa clones. Dead-end trench can reduce erosion and surface run-off as well as improve rooting and soil organic matter sequestration. The objectives of this research were to study the effects of dead-end trench application on morphological characters of roots and yields of three cocoa clones and to determine which cocoa clone(s) performed a signifificant yield increase with the application of dead-end trench. The research was conducted in August 2018â€“April 2019 at Pagilaran Ltd. cocoa plantation in North Segayung Production Unit, subdistrict Tulis, Batang, Central Java. The experiment was arranged in a randomized complete block design with two factors and three replications as block. The first factor was dead-end trench application (with and without dead-end trench application) and the second factor was cocoa clones (RCC-70, RCC-71, and KKM-22). This study showed that application of dead-end trench and clones significantly increased root fresh weight, root dry weight, seed fresh weight, and seed dry weight, but had no significant effect on fruit diameter, fruit length, root length, and root surface area. RCC-70 clone, coupled with the application of dead-end trench, resulted in the highest seed dry weight compared to RCC-71 and KKM-22 clones.

Growth and yield of five prospective shallot selected accessions from true seed of shallot in lowland areas Endang Sulistyaningsih; Retno Pangestuti; Rini Rosliani
Jurnal Ilmu Pertanian Vol 5, No 2 (2020): August
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

True seed of shallot (TSS) from open pollination crossing are in the heterogenous as a result of the heterozygous parents. This condition gives the opportunity to obtain new selected accession through the genetic variations of their seedlings. Five TSS cultivars of Biru Lancor, Pancasona, Tuk-Tuk, Lokananta, Sanren were used as planting materials to be evaluated the growth and bulb yield performance for the selection of excellent shallot selected accessions in bulb production. The 300 seeds of each cultivar were planted in the field of Faculty of Agriculture, Universitas Gadjah Mada, Banguntapan, Bantul District, Yogyakarta (100 m above sea level). All seedlings were observed for the survival rate, plant growth, and development of bulb. The results showed that the seedlings of Sanren, Lokananta, Pancasona, Tuk-Tuk, and Biru Lancor could germinate with different survival rate of 88%, 87%, 80%, 67.3% and 48%, respectively. There was a significant difference in number of leaves that effected in developing a single bulb and multi-bulb. Prospective selected accessions with high yield in lowland areas was as follows: Biru Lancor 12 plants (4%), Pancasona 20 plants (6.7%), Sanren 146 plants (48.7%), and Lokananta 25 plants (8.3%). All of the selected bulbs will be planted again for further evaluation in excellent trait of bulb aggregation (bulbs multiplication).

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