Studies On The Cultivation Model For High Yield And Characteristics Of Chuandan No.21 In The Mountain Areas Around The Sichuan Basin

The relationship between grain yield and characteristics of Chuandan No.21 in the mountain area around the Sichuan basin with sowing date,density and nitrogen fertilizer were studied by using the orthogonal rotation design of quadratic regression. The results were summarized as follows:The experimental factors had most significant effects on the yield,1000-seed weight,effective ears, the kernel numbers of per ear,ear position, ratio of lodging, leaf area exponent during each period and stem diameter during mature period. The experimental factors had significant effects on ear length, barren ear tip and stem diameter during tassel emergence, there had no significant effects of the four experimental factors on the ratio of empty stalk, fresh weight of stem and leaf, stem diameter during sprouting and plant height during each period.The density had the greatest effect on the yield, followed by sowing date and nitrogen application rate.Among the experimental factor, the density had the greatest effect on leaf area exponent during sprouting, followed by nitrogen application rate and sowing date. The sowing date had thegreatest effect on the leaf area exponent during tassel emergence , followed by density and nitrogen application rate, The density had the greatest effect on the leaf area exponent during mature period,followed by sowing date and nitrogen application rate.The experimental factors had influenced the protein contents and starch content most significantly. The density had the greatest effect on protein conents, following by sowing date and nitrogen application rate, The sowing date had the greatest effect on starch contents, followed by density and nitrogen application rate.There were significant positive correlations between the yield and leaf area exponent during each period, This experiment had formed the synthetical culture measures for getting a yield over 7500 kg per hm" ,which was composed by sowing date was on April. 12 ~ 21, density was 6.79X104~7.07X 104 plants per hm2 and nitrogen usage was 192.9 -266.4kg per hmJ.It also had come to the synthetical culture measures for getting u absolute yield of protein over 600 kg per hm2, which was composed by sowing date was on April. 14-23, density was 6.53 X 104~ 6.92 X 104 plants per hm2 and nitrogen usage was 222.54~287.88kg per hm" , The synthetical culture measures for getting a absolute yield of protein over 600 kg per hm2 and yield over 7500 kg per hm2 had some consistency. Therefore, there are some possibilities to realize the synchro amendment of yield and quality.