在粘壤土上开展试验,研究了施氮量和氮磷钾配比对蓖麻品种淄蓖7号生长特性、干物质积累和产量的影响。结果表明:施氮量、氮磷钾配比以及两者互作对蓖麻的生长特性、干物质积累和产量均产生了显著或极显著的影响;随着施氮量从225.0 kg/hm~2到375.0 kg/hm~2、氮磷钾配比从1∶0∶0提高到1∶0.9∶1.5,蓖麻的株高、叶干重、茎干重、叶面积指数、籽粒产量均显著增加;籽粒产量的增加主要来源于每株穗数的增加和百粒重的提高;施氮量375 kg/hm~2、氮磷钾配比1∶0.9∶1.5处理的籽粒产量最高,达2163.6 kg/hm~2。
A field experiment was carried out in clay loam to investigate the effects of nitrogen application rate and nitrogen-phosphorus-potassium ratio on the growth characteristics, dry matter accumulation and grain yield of castor variety Zibi No. 7. The results indicated that: nitrogen application rate, nitrogen-phosphorus-potassium ratio, and their interaction all had significant or very significant effects on the growth characteristics, dry matter accumulation and grain yield of castor plants;when the application rate of nitrogen increased from 225.0 kg/hm~2 to 375.0 kg/hm~2, and the nitrogen-phosphorus-potassium ratio increased from 1∶0∶0 to 1∶0.9∶1.5, the plant height, dry leaf weight, dry stem weight, leaf area index and grain yield of castor plants all increased significantly;the increase in grain yield was caused mainly by the increase in both single-plant spike number and 100-grain weight;the treatment of applying 375 kg/hm~2 nitrogen combined with the nitrogen-phosphorus-potassium ratio of 1∶0.9∶1.5 obtained the highest castor grain yield(2163.6 kg/hm~2).
Acta Agriculturae Jiangxi
Nitrogen application rate