密度与氮素水平对小黑麦群体动态、产量及构成因素的影响

以小黑麦东农5305为材料,设置氮水平和栽培密度两个因子,施氮量0、75、150、225kg·hm-2;密度300、450、600万株·hm-2,研究了不同密度与氮素水平对小黑麦分蘖成穗及产量构成的影响。结果表明,东农5305在300万株·hm-2、75kg·hm-2处理时茎蘖成穗率最高,产量也最高。由此可知,对于分蘖能力较高的东农5305应适当降低基本苗,少施氮肥,主攻穗粒数和千粒重,实现高产。

Effect of density and nitrogen on population dynamics, yield and its Component

This study took Dongnong5305 as experiment sample, two factors, nitrogen application (N) and density treatment (D)were used. Four nitrogen applications were as follows: 0 (N0), 75 (N75), 150 (N150), and 225 kg· hm-2(N225). Three density treatments were namely D300(3 million basic seedling per hectare), D450 (4.5 million basic seedling per hectare), D600 (6 million basic seedling per hectare), the experiment study the effect of earbearing tiller and yield components under different densities and nitrogen levels. The results showed that the percentage of earbearing tiller by stems and tillers was the highest under D300 and N75, at the same time, grains yield was the highest. In order to attain high output, Dongnong5305 should decrease properly the basal seedling and nitrogen manure to increase the grain number per ear and 1000-kernel weight.