Judul: Combined use of inorganic and organic fertilizers for tomato yield and fertility of oxisols
Abstrak: Productivity of Oxisols could be improved by addition of organic and inorganic fertilizer. Recently, the use of organic fertilizer is increasing for long term friendly fertility management. The objectives of this research were to determine the appropriate combination of inorganic and organic fertilizer application on tomato yield and to increase nutrient utilization efficiency in the soil, and to determine the effect of combination of inorganic with organic fertilizers on soil chemical properties. The experiment was conducted at Bogor Agricultural University from November, 2009 to July, 2010. The treatments were designed using Factorial experiment in Randomized Complete Block Design (RCBD) with three replications. The treatment consisted of two factors which were rates of inorganic fertilizer [(0-0-0), (2.53 urea- 1.68 SP- 3 KCl), (4.68 urea- 3.12 SP- 6.52 KCl) and (7.2 urea- 4.8 SP- 10 KCl) (g/pot)], and organic fertilizer [0, 200, and 400 (g/pot), (Compost of cow dung, husk and straw in the ratio 1:1:2 by volume) or (Compost of cow dung, husk and peat in the ratio 1:1:2 by volume)]. Replication was treated as block. Data were analyzed using Microsoft Excel, ANOVA using the General Linear Model (GLM) option of Minitab software. The result of the research indicated that combined use of inorganic and organic fertilizers had positive effects on tomato yield and plant nutrient efficiency. The best combination of inorganic fertilizer occurred at lowest doses with organic fertilizer at 200 or 400 g/pot. Combination of inorganic fertilizer at (2.53 urea- 1.68 SP- 3 KCl, g/pot) with straw or peat compost at 400 g/pot resulted in the highest tomato yield than other combinations. Combination of inorganic fertilizer at (2.53 urea - 1.68 SP - 3 KCl, g/pot) with straw compost at 400 g/pot or peat compost at 200 and 400 g/pot resulted in the highest nutrient efficiency. Soil chemical characteristic after harvesting in both organic and inorganic fertilizer treatments had a sound of soil fertility than the soil before planting or fertilizing and increased the use of fertilizers also increased on the soil fertility.
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Judul: Optimasi Dosis Pupuk Anorganik dan Pupuk Kandang Ayam pada Budidaya Tomat Hibrida (Lycopersicon esculentum Mill. L.).
Abstrak: The objective of this research was know the effect of fertilizer and manure to growth and productivity of hybrid tomato (Lycopersicon esculentum Mill. L).This research obtained at Pasir Sarongge Experimental Field University Farm Bogor Agricultural University, Cipanas, from February to July 2011. The experimental design used was Completely Randomized Block Design, with two factors and three repetitions. First factor was manure dosages which were 0, 10, 20, and 30 ton ha-1. Second factor was fertilizer dosages which were 0%, 75%, and 150% of recommended dosage. Recommended dosage use was 100 kg ha-1 N, 100 kg ha-1 P2O5, and 50 kg ha-1 K2O, recommendation from Ministry of Agriculture (2002). Plant height showed quadratic response to manure at 2 and 4 week after transplanted (WAT), then linier at 6 WAT. As to fertilizer, plant height showed no response at 2 WAT yet showed linier response at 4 and 6 WAT. Interaction between manure and fertilizer happened at 8 WAT. Manure gave linier response to number of leaves at 2, 4, and 8 WAT but not significant at 6 WAT. Fertilizer gave no significant response at number of leaves. Manure gave quadratic response as fertilizer gave linier response to fruit weight per plot, fruit weight per hectare estimation, and relative yield. Optimal manure dosage given from this research was 24.375 ton ha-1. Maximum fruit weight per plot was 17.41 kg per plot. Maximum fruit weight per hectare estimation was 22.79 ton ha-1. Manure gave linier response to fruit weight per plot of grade A and B. Fruit weight per plot of grade C, fruit diameter, and average fruit weight was not affected by manure or fertilizer given.
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Judul: Embriogenesis ikan buta (Astyanax fasciatus)
Abstrak: Ikan buta Astyanax fasciatus adalah spesies ikan unik dari famili Characidae yang menempati perairan dalam gua di Wilayah La Cueva Chica-San Luis Potasi-Mexico. Ikan ini memiliki mata yang tereduksi (Blind Cavefish) dan warna kulit merah muda, pucat serta mengkilap.
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