高寒牧区播期和施氮对不同燕麦品种氮素利用的作用

Effect of sowing date and N-fertilizer on nitrogen absorption and utilization of different oat varieties in alpine grassland area

采用差值法研究了播期和施氮量对不同燕麦Avena sativa品种氮素吸收利用的影响。结果表明:播期与施氮量对燕麦植株体内氮的积累与运转皆有显著影响。从花期与成熟期总氮积累量及种子氮积累量来看,各品种4月下旬播种效果最佳,而施氮量则以100 kg/hm2最好,但氮肥的施用时间应依不同生产目的与品种而定;播期与施氮量对燕麦氮肥利用率也有显著影响,不同品种的氮肥利用率随播期与氮肥处理的变化规律各不相同。不同播期下,氮肥处理对氮肥利用率的影响亦不同。

Margin method was used to study the effect of sowing date and N-fertilizer on N-accumulation and utilization in different oat cultivars.The results showed that both sowing date and N-fertilizer had significant effects on N-accumulation and translocation.From the total N and seed N accumulation,the optimal sowing date was late April and the best N-fertilizer amount was 100 kg/hm^2.The time of N-fertilizer application should be determined according to the production purpose and genotypes.Effect of sowing date and N-fertilizer on N-fertilizer use efficiency was also significant.The N-fertilizer use efficiency of different cultivars was different with different sowing date and N-fertilizer treatments.N-fertilizer treatment had different effects on N-fertilizer use efficiency under different sowing dates.