氮磷钾优化施肥对夏大豆产量的影响

氮磷钾优化施肥试验研究表明:夏大豆籽粒产量和单株粒数与氮磷钾施肥量呈二次曲线关系,籽粒产量和单株粒数随着施肥量的增加而增加,增加到一定水平后又开始下降。大豆籽粒产量和单株粒数受施氮量的影响最大,磷肥次之,钾肥更次之。在土壤供肥能力1 568.6 kg/hm2,密度为18万株/hm2的条件下,当施氮量为65.56 kg/hm2,施磷量63.73kg/hm2,施钾量39.25 kg/hm2时,濉科998产量最高,最高产量为2 745.7 kg/hm2;当施氮量为64.80 kg/hm2,施磷量59.42kg/hm2,施钾量37.11 kg/hm2时施肥效益最高,经济产量为2 743.7 kg/hm2。

Optimization fertilization experiment of nitrogen, phosphorus and potassium showed that： grain yield and grains per plant of soybean sowing in summer had the conic relations with the using of the nitrogen, phosphorus and potassium fertilizer amount. Grain yield and grains per plant increased as fertilizer increasing at a certain level and then began to decline. Soybean grain yield and grains per plant influenced greatly by the largest amount of nitrogen, followed by phosphate and potash fertilizer. Under the condition of 1 568.6 kg/hm^2 soil fertilizer and 180, 000/hm^2 density, when nitrogen application rate was 65.56 kg/hm^2, phosphorus application rate was 63.73 kg/hm^2 , the amount of potassium application rate was 39.25 kg/hm^2, Snike 998 had the maximum output and its maximum output was 2 745.7 kg/hm^2 ; when the nitrogen application rate was 64.80 kg/hm^2, phosphorus application rate was 59.42 kg/hm^2, the amount of potassium was 37.11 kg/hm^2 , we would get the most effective fertilization benefits and its economic output was 2 743.7 kg/hm^2.