Efficiency of potassium fertilizer administration on yield of soybean (Glycine max (L.) Merrill)
1996
Aiman, N. (Universitas Syiah Kuala, Banda Aceh (Indonesia). Fakultas Pertanian)
One of difficulties in achieving potassium fertilizer efficiency was caused by plant luxury consumption of potassium. A field research and laboratory analysis to determine efficiency of potassium fertilizer administration was conducted at Kuta Alam Banda Aceh and in Soil Testing Laboratoy of Agriculture Faculty of Syiah Kuala University since September 1995 to January 1996. The research was set up according to Randomized Completely Design (RCD) with levels of potassium dosages, 0, 30, 60, 90, dan 120 kg KCl ha-1 with five replications. The results showed that the yield components represented by number of pod plant-1 and seed dry weight plant-1 was highly significantly affected by potassium fertilizer administration. Potassium absorbed by plant was also highly significantly affected by potassium fertilizer administration. The highest yield component was obtained at potassium dosage of 90 kg KCl ha-1, whereas the highest potassium absorbed by plant was obtained at 120 kg KCl ha-1. Quadratic relationships were found between potassium dosages and number of pods plant-1 as well as between potassium dosage and seed dry eight plant-1. The regression lines were : Y = 22,03 + 0,542X - 0,0032X2 with R2 = 0,938; and Y = 9,96 + 0,42X - 0,023X2 with R2 = 0,914, for number of pods plant-1 and seed dry weight plant-1, respectively. The relationships between potassium dosage and potassium absorbed by plant was linear with regression line of Y = 1,41 + 0,0086X and R2 = 0,998. Optimum potassium dosage for number of pods plant-1 was 84,69 kg KCl ha-1 while optimum potassium dosage for seed dry weight plant-1 was 91,52 kg KCl ha-1. Furthermore, The highest yield efficiency and economic return were obtained at potassium dosage of 60 kg KCl ha-1
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