Abstract:

In the experiment, five different designs about N application rate were studied of disposable in order to obtain the best one. Photo out, chlorophyll content, the tillers, foliar age and etc. were analyzed under different stage. The results showed that, the most number of leaf was 15, and the maximum of the tillers was 45 per point. At the same time, the maximum chlorophyll content was 49.28. 10280.4 kg/hm2 was bigger yield under 300 kg/hm2. The analysis of economic benefit showed that, 225 kg/hm2 was the best N application rate under the condition of film mulching, and 10172.25 kg/hm2 was the best yield.