摘要
本文研究了不同氮肥水平对非洲狗尾草、纳罗克种子产量和干物质的影响。结果表明:施氮肥量与种子产量和干草产量呈正相关。年度间差异比较大。最佳施氮肥期是在生长早期。1987年每公顷施纯氮184公斤效果最好,种子产量为468.8公斤/公顷,干草产量13 387公斤/公顷。施氮肥量与种子产量和干草产量呈极显著的正相关(r=0.96505,r=0.9284),其线性回归方程为:y=166.5+1.61x,y=4262+51.03x。1988年每公顷施纯氮161公斤,种子产量315公斤/公顷,干草产量8488公斤/公顷。施氮肥量与种子产量和干草产量呈正相关(r=0.9789,r=0.94916),其线性回归方程:y=37.17+1.3x,y=3 140+30.34x。经方差和最小差(LSD)测定分析,分别达极显著水平(p<0.01)。
A preliminary study was undertaken to evaluate the effect of different application rates of Nitrogen on the seed and dry matter yield of Setaria CV.Narok. The results indicated that the seed and dry matter yield differed yearly. The best nitrogen application time was in the early development stage of the crop. The highest seed and dry matter yield of 468.8 and 13 387 kg/ha were achieved respectively with nitrogen application rate of 184 kg N/ha in 1987. There were highly positive correlation between nitrogen application and seed and dry matter yield in both 1987 and 1988 [seed yield: r=0.96505(1987), r=0.9789(1988); DM: r=0.9284(1987), r=0.94916(1988)]. The linear regression equation for the seed, dry matter and nitrogen application rate could be expressed as: seed yield{^(y=166.5+1.61x )_(y=37.17+1.38x)DM{^(y=4262+51.03x in 1987) _(y=3140+30.3x in 1987)
出处
《草业科学》
CAS
CSCD
北大核心
1990年第3期52-55,共4页
Pratacultural Science
