不同施氮水平对象草生产性能的影响

Effect of different nitrogen application levels on the productivity of Pennisetum purpureum

对象草Pennisetum purpureum的7个施氮处理采用完全随机区组设计,3茬刈割测定结果表明,每茬施氮处理间的干物质产量存在极显著差异(P<0.01)。第1茬以施纯氮量165.6 kg/hm2为最佳处理,干物质产量为7.2 t/hm2;第2、第3茬的施纯氮量均以124.2 kg/hm2水平为宜,干物质产量分别为7.2和14.8t/hm2。回归分析显示,在相应处理范围内,每茬的施氮量与分蘖数、株高、干物质产量间均存在显著(P<0.05)或极显著(P<0.01)的直线回归关系。

Using randomized complete block design, the yields of Pennisetum purpureum at 7 nitrogen application levels were studied. The result showed that the dry matter yields of different nitrogen application had significant treatment effect （P〈0.01）. 165.6 kg/hm^2 pure nitrogen application was better for the first crop, 7.2 t/hm^2 can be gained; applying 124.2 kg/hm^2 pure nitrogen was better for second and third crop, their yields were 7. 2 t/hm^2 and 14.8 t/hm^2. Regression analysis on corresponding treatments showed that there were significant （F〉F0.05） or more significant （F〉F0.01） correlation per crop between dry matter yield and tillering number, plant height, between applied nitrogen quantities and tillering number, plant height, dry matter yields.