The Physiology Study On Soybean In High-yield Cultivation

Dry matter accumulation, uptake and accumulation of N, P, K, accumulation of oil and protein in two soybean Cv (JiYu 47, JiYu 56) under different densities and fertilization during seed-filling stage, as well as yield formation, were systematically studied. As a result, key physiological indices and cultivation techniques for yield above 3000㎏ per hm2 were as follow leaf area index (LAI),which had a maximum of 5. Leaf area duration (LAD) accumulated to more than30×105㎡·d/hm2. N, P concentration in kernel was the highest in maturity, while Kconcentration in shell was the highest. Nitrogen accumulation in individual plant is the highest, then P2O5 and K2O. Production per 100㎏ kernel assimilates separately 9.19㎏N, 2.83㎏P2O5 and 3.66㎏K2O, the proportions of absorption content on N, P2O5 and K2O were 3.25:1:1.29. During seed-filling period, dry matter and oil accumulation in soybean seeds showed typical "S" curve. Protein accumulation was a "W" curve, increasing slowly in seed-filling stage. Agronomical measures for soybean yield over 3000㎏/hm2 were suggested as follows: density, 285000 plants/hm2; P2O5, K2O and N at planting, 60kg/hm2, 30 kg/hm2, 46.8 kg/hm2 respectively; top-dressing N, 52.5 kg/hm2。...