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Screening of Soybeans Genotypes to Aluminum Toxicity and Drought Stress Hanum, Chairani; Mugnisjah, Wahju Q.; Yahya, Sudirman; Sopandie, Didy; Idris, Komaruddin; Sahar, Asmarlaili
Forum Pasca Sarjana Vol 32, No 4 (2009): Forum Pascasarjana
Publisher : Forum Pasca Sarjana

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Abstract

The objective of this experiment was to screen 16 soybean genotypes tolerance to double stresses of Al toxicity and drought stress.  A pot experiment was conducted at Cikabayan Experimental Station of Bogor Agricultural University from January to Maret 2004.  Soybean plants were grown in Gajrug ultisol soil with pH 3.9 and Al saturated 26.61 me/100 g of soil.  Al toxicity and drought tolerance were measured from the root length of seedling grown in 75% Al saturation and 40% field capacity compared to 25% Al saturation and 80% field capacity.  The decrease of root length much lower at 75% Al saturation and 40% field capacity. Result of the study showed that soybean of Moket, B.3799, Malabar, Wilis, Sindoro, and Slamet were tolerant while Dieng, Sinyonya, B.3780, Sicinang, B.3578, Ceneng, Epyek, MLG 3072, and Tidar were susceptible to Al toxicity and drought stress. Key words: soybean, Al toxicity, drought stress, selection
EFISIENSI SERAPAN UNSUR 15N-UREA DAN PROPORSI FIKSASI N OLEH TANAMAN KEDELAI TIDAK BERKOTILEDON PADA BUDIDAYA JENUH AIR Avivi, Sholeh; Mugnisjah, Wahju Q.; Idris, Komarudin; Sisworo, Elsye L.
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 25, No 1 (1997): Buletin Agronomi
Publisher : Bogor Agricultural University

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Abstract

This pot experiment was to evaluate the influences of cotyledons detachment at seedling stage on the efficiency of labelled N-urea uptake and proportion of N-fixation by soybean cv. Wilis grown under saturated soil culture. Based on the result of preliminary experiment, cotyledons detachment was held at 7 days after sowing (das). The cotyledons detachment significantly reduced N-urea uptake efficiency and N-fixed proportion. The N-urea uptake efficiency at 21 days, R4, R5, R6, and R8 stages by cotyledons-detached plant were 30.5 %, 24.6 %, 23.7 %, 24.0 %, and 22.45 of the total N assimilated. Those of the cotyledons undetached-plant (control plant), the value were 31.6 %, 24.05, 24.7 %, 2.7 %, and 23.6 % respectively. At R8 stage, the cotyledons-detached plant has the amount of N-fixed proportion of 54.2 and N-soil of 23.4 %, whereas those of the control one had the amount of 49.7 and 26.7 % respectively. N-urea uptake, N-fixed, and N-soil uptake by the cotyledons- detached plant were lower than that of the control one (i.e. 69, 80, and 645 of the control respectively). The cotyledons detachment also result in inferior vegetative and productive growth of the plant in terms of decreased root dry weight (21.1 %), leave dry weight (18.8 %), plant dry weight (26.7 %), pot dry weight (23.8 %), grain number/pot (32.8 %), and grain dry weight (26.9 %). It seems that the lower growth and yield of the cotyledons-detached soybean paint were caused by the lower total N-uptake due to cotyledons detachment.
Pengaruh Waktu dan Cara Pemberian N sebagai Pupuk Tambahan terhadap Pertumbuhan dan Hasil Kedelai (Glycine Max (L.) Merr.) pada Budidaya Basah Mulatsih, Sri; Mugnisjah, Wahju Q.; Sopandie, Didy; Idris, Komaruddin
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 28, No 1 (2000): Buletin Agronomi
Publisher : Bogor Agricultural University

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Abstract

An experiment was conducted at Muara Experimental Station, Research Institute of Food Crops Biotechnology, Bogor, from October 1996 to January 1997. Split block design was used in this experiment. Factors of experiment consisted of time of fertilizer application (3 week after planting (wap), 3 and 5 wap, and 3, 5, and 7 wap) and method of N fertilizer application (100% fertilizer through soil; 75% through soil, 25% through leaves; 50% through soil, 50% through leaves; 25% through soil, 75% through leaves; and 100% through leaves). Result of experiment showed that N application at 3 and 5 wap with 50% through soils and 50% through leaves increased dry weight to 11.4% if compared to 100% N through foliar application. Time of N application to 7 wap increased empty pod/plant to 31%. Method of N fertilizer application through leaves damaged the soybean leaves.   Key word: Fertilization, Nitrogen, Soybean
Agribisnis Terpadu Bersistem Leisa di Lahan Basah : Model Hipotetik Mugnisjah, Wahju Q.; Suwarto, ,; Solihin, Ahmad S.
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 28, No 2 (2000): Buletin Agronomi
Publisher : Bogor Agricultural University

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Abstract

LEISA refers to forms of agriculture that seek to optimize the use of locally available resources by combining the different components of the farm system (i.e. plants, animals, soil, water, climate and people) so that they complement each other and have the greatest possible synergetic effects: In the system of LEISA proposed here, ecological risks generated by the external inputs are avoided; and reversally, the farm system performance is enriched by the use of internal inputs (including by products)p reduced in the agro-ecosystem. The external inputs in the form of agro-chemicals (inorganic fertilizers and pesticides) are used in a limited to replace nutrients transported out of the agro-ecosystem through harvest. Selecting a hypothetical model of LEISA by integrating crop production (1.25 ha),fish nursery (0.50 ha), and duck husbandry (1000 ducks at the dike of pond) shows that the system being feasible. The hypothetical model needs investation cost as much as Rp 64 195 000 and operational cost of Rp 41289825, giving a total cost of Rp 105484825 (as lending cost). Based on the estimation of monthly cash flow with annual DF 18% and grace period of 11 months, the hypothetical model gives NPV at the 36th month = Rp 38 556 960, Net B/C = 1.43, IRR = 39.42. and payback periods = 25 months. Key words: Leisa, Agribisniss, Wet land, Model