Pengaruh pemberian kapur dan fosfat terhadap serapan P, pertumbuhan dan hasil kedelai pada tanah ultisol Sukamandi.
1988
Tirtoutomo S. | Simanungkalit R.D.M.
A greenhouse experiment was conducted from July to December 1987 to determine lime and phosphate dosages for optimum uptake of P and other nutrient in order to achieve high soybean yield. Ultisol soil with a low pH (4.45) and Al saturation (9.06 percent) was used in this experiment. The results showed no interaction effect between lime and phosphate fertilizer. Lime application increased soil pH, uptake of N, P, K. Ca and Mg, leaf area, root and plant dry weight of soybean variety Lokon at 33 days after planting (DAP), but decreased exchangeable Al content. At 52 DAP, lime application increased soil pH, uptake of P, K, Ca, and Mg, number of active nodules, leaf area, and plant dry weight, but decreased exchangeable Al content. Lime application increased the increment of Ca and Mg uptake, and phosphate application increased the increment of P and Mg uptake from flowering stage (33 DAP) to grain filling stage (52 DAP). Phosphate fertilizer increased uptake of N, P, K, Ca and Mg, leaf area, root and plant dry weight of soybean at 33 DAP. At 52 DAP, phosphate fertilizer increased available P of the soil, uptake P, K, Ca, and Mg, leaf area, and plant dry weight. Lime and phosphate application increased the number of field grains but not 100-grain weight. The maximum yield was estimated at 5.96 g/plant at the lime dosage of 6.2 times exchangeable content (equivalent to 1736 kg/ha of CaCO3). The maximum yield of 5,61 g/plant was achieved at the phosphate dosage of 95.24 kg P2O5/ha.
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