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Effectiveness of K-fertilizer residue on various of soil water available on growth, soil properties and yield of soybeans in Inceptisols 1 Department of Soil Science and Land Resources, Agriculture Faculty, Universitas Padjadjaran, Jl. Raya Bandung - Sumedang Km. 21 Jatinangor 45363 phone: (+62) 227796316- Fax: (+62) 22 7796316 West Java - Indonesia Abstract The aim of this research was to study the effectiveness of K-fertilizer residue on various percentages of soil water availability on growth, soil exchangeable-K, K-uptake and yield of soybean (Glycine max L. Merr) cv. Anjasmoro in Inceptisols. This research was conducted in a controlled plastic house laboratory, Agriculture Faculty of Universitas Padjadjaran. Randomized Complete Block Design was used in this experiment. The first factor was soil K-fertilizer residue with four levels (k0 control, k1 1x, k2 1,25x, and k3 residue of 1,5x of recommended doses, respectively) and the second factor was percentage of soil available water with four levels (w1 = 100% w2 = 80% w3 = 60% and w4 = 40% available water, respectively). The results showed that residue of 1,5x recommended dose of K-fertilizer on 100% water available significantly affected growth components (plant height, number of leaves, plant dry weight) and plant K-uptake at 4-6 weeks after plant. Independently, higher soil exchangeable-K was found on control. Higher yield component (weight of 100 seeds) was produced by residue of 1,5x recommended dose of K-fertilizer on 100% soil water available. Compared to control, however, residue of 1-1,25x recommended doses of K-fertilizer were still effective in providing soybean yields (0.93 - 1.40%). Keywords: K-fertilizer residue, soil available water, soil properties, soybeans (Glycine max L. Merr) Topic: Soil and Water management |
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