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 9.19ãŽN, 2.83ãŽP2O5 and 3.66ãŽK2O, 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 3000ãŽ/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。...
|