| In order to transform the methods of maize production and meet the demand for mechanization, a comparative test among different maize cultivars was carried out with parameters involving yield, growth period, grain moisture to select superior maize cultivars with precocity, density-resistance and mechanization yield. The preferable maize cultivar Shaandan 636 was acuqired and it showed its physiological properties and the suitable growth density as well as processing multi-point model production demonstration in different ecological zones through the density experiment in different maize types. Overall, it provided a scientific evidence for the promotion of Shaandan 636.The results are as following:1.a comprehensive evaluation of 38 new combinations cultivated in four sites in 2014 was conducted through analyzing the correlation between grain moisture when harvest and yield as well as that between yield and variation coefficient. The resulted suggested that new combination SDJ18(Shaandan 636) and SDJ25 tended to have low yield variation, good stability, lower grain moisture(less than the mean value with 23.4%), good phenotypic traits of ears when harvest and good grain dewatering performance.2.Through Survey Yield and Growth Period 2015 corn machine income in Shaanxi Province regional test varieties, it can be seen that there was no significant difference in production between Shaandan 636 and Xianyu335, the average growth period of Shaandan 636 was 1.1 days and 7 days for spring seeding and summer seeding respectively when comparing with CK(Xianyu335).3.Since 2015, six varieties of three locations four kinds of density test showed there was no significant difference in grain moisture and yield between Shaandan 636 and Xianyu335.Under the density of 7.5×104 /hm2, the highest yield and the lowest grain water content were the Shaan 636. Different density test of Shaandan 636 indicated that at high densities 6.0×104plants/hm2-13.5×104plants/hm2 level, the yield reached 0.9×104kg/hm2, planting density was the highest yield in 12.0×104plants/hm2 level, 1.07×104kg/hm2. Through the two tests comprehensive analysis mentioned above, early maturity, tolerance to high density, corn machine income should highest yield of Shaandan 636 at 7.5 ×104plants/hm2 planting density.4.From the new varieties acceptance testing in field, Shaandan 636 was more than 1000 kg / mu in yield and less than 22% in grain moisture when comparing with the CK Shandan 609, which showed higher production potential and good dehydration.5.The physiological analysis of Shaandan 636 showed that: under conditions of high density, it was still able to maintain the amount of dry matter accumulation after high flower after flower formation of dry matter accumulation and grain yield rapid phase synchronization; at the four lower densities, Shaandan 636 actived grain filling period(P) maximum, with greater than 40 days; in four density dehydration showed "fast- slow- fast- slow" trend of different maize varieties, other varieties tested in September 15-20 days dehydration fastest Shaandan 636 on September 21-26 dehydration fastest.6.The three demonstration demonstration in Yulin, Yijun and Xunyi showed that under high density condition, Shaandan 636 presented higher yield, lower grain moisture and crushing rate when mechanical harvest, as well as stronger lodging resistance than the control-Xianyu335. |
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