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以南方早熟(125~135 d)、中熟(136~145 d)和迟熟(146~155 d)中粳为材料,大田条件下研究4种氮肥水平即0、150、225、300 kg/hm2纯氮对水稻产量、氮素吸收的影响,并对产量和氮素吸收基因型差异进行评价。结果表明,不同生育期类型水稻平均产量和吸氮量随着施氮水平的增加而增加,在同一氮肥水平下,并随生育期的延长而增加;同一生育期类型,产量与吸氮量均存在显著或极显著基因型差异。采用组内最小平方和动态聚类法对3种类型水稻产量和总吸氮量及百千克籽粒吸氮量分别进行聚类分析,按从低到高的顺序均划分为Ⅰ、Ⅱ、Ⅲ、Ⅳ4种类型,方差分析表明,4种划分类型存在显著或极显著差异,每一划分类型基因型间变异系数大部分在0~5%波动。通过综合归类对各基因型水稻产量、总吸氮量及百千克籽粒吸氮量的分类标准吻合性进行评价,初步筛选出3种生育类型中高产高氮素吸收和低产低氮素吸收两种类型水稻基因型。
Under the field conditions, four nitrogenous fertilizer levels (0,150,225,300 kg / dm ^ 2) were studied under the conditions of early maturing (125-135 d), middle maturing (136-145 d) and late maturing (146-155 d) hm2 of pure nitrogen on rice yield and nitrogen absorption, and to evaluate the difference of yield and nitrogen absorption genotypes. The results showed that the average yield and N uptake of rice in different growth stages increased with the increase of N application level, and increased with the extension of growth stage under the same N level. The type, yield and N uptake in the same growth stage There are significant or very significant genotypic differences. Cluster analysis of the three types of rice yield and total nitrogen uptake and grain nitrogen uptake per 100 kg were conducted by using the least square sum dynamic clustering method and classified into Ⅰ, Ⅱ, Ⅲ, Ⅳ. The analysis of variance showed that there were significant or extremely significant differences among the four types of distribution, and the coefficients of variation of most of the genotypes fluctuated between 0 and 5% for each of the four types. Through the comprehensive classification of the genotypes of rice yield, total nitrogen uptake and grain nitrogen uptake per kg classification standard anastomosis to evaluate the three kinds of reproductive types of high yield and high nitrogen absorption and low yield and low nitrogen absorption two Genotypes of rice genotypes.