不同施氮量对夏谷生态学指标及经济效益的影响

以冀谷19和沧谷4号为试验材料,探究不同施氮量对于夏谷品种群体结构、形态特征、产量形成及经济效益的影响。结果表明:不同施氮处理对不同品种地上部干物质积累及运转的时间上有差异;沧谷4号的各项生态学指标及产量随着施氮量的增加表现为先增后降,在施氮量为150 kg/hm2时有效穗数、穗粒重最大,生物产量及经济产量最高;而冀谷19各项生态学指标及产量随着施氮量的增加而增加,冀谷19的有效穗数、穗粒重在各施肥处理间差异不显著,在施氮量为225~300 kg/hm2时,经济产量最高,但不同施氮处理沧谷4号各项生态学指标及产量显著优于冀谷19。

Effect of Nitrogen Application Rate on Ecological Indicator and Yield of Summer Millet

Using Jigu 19 and Canggu 4 as materials,the study was set to discovey the effect on the group struc-ture ,morphological characteristics and yields of respective summer MIllet breeds under different Nitrogen ap-plication level.Results showed that nitrogen application has different effect on time regarding the accumulation and transfer of overground dry matter of different breeds.And the with the N level went up ,the ecological in-dicator and yield of Canggu 4 rose first and then decesended,and at a level of 150 kg/hm2 ,It had the highest number,weight as well as he economic yield.The ecological indicator and yield of Jigu 19 went with the level of Nitrogen fertilizer,but its staistics didn’t show no significant difference.Between the rate of 225 -300 kg/hm2 ,two breeds both had highest yields,but the ecological indicators and yields of Canggu 4 were much better than those of Jigu 19 undaer different Nitrogen application leve.