Abstract:

In this treatise, the plant shape characters of nitrogen high efficiency and high yield variety was investigated using 16 mid-season hybrid rice combinations in two levers nitrogen applied. The results showed that there were significant genotype differences in nitrogen efficiency, the nitrogen recovery efficiency and the nitrogen agronomic efficiency are the important index for selecting nitrogen high efficiency and high yield variety in mid-season hybrid rice. In 25 plant shape characters, there were significant effect of the maximum tillers, the grain Leaf ratio, the 1000-grain weight, the length and the width of 3rd leaf from top on the nitrogen recovery efficiency and the nitrogen agronomic efficiency. In normal nitrogen applied condition for high grain yield, the plant shape characters for nitrogen high efficiency and high yield variety in mid-season hybrid rice were that the tillering ability, the seed setting percentage, the 1000-grain weight, the length of 3rd leaf from top, the dry weight of biology yield and the harvest index all were relatively high, but the width of 3rd leaf from top and the grain Leaf ratio at full panicle stage were relatively low, the R2 of them on the nitrogen recovery efficiency and the nitrogen agronomic efficiency were 93.99% and 95.82%. Which can be used as an reference index of selecting mid-season hybrid variety for nitrogen high efficiency and high yield variety.