【摘要】 通过前期基蘖肥与后期穗粒肥的氮肥运筹比例的试验研究 ,阐明了杂交稻秧田和大田期的分蘖成穗规律及其在产量形成中的作用 ,并提出了适宜的前后期氮肥运筹比例为 6∶ 4。更多还原

【Abstract】 The experiment on the ratio of basal and tillering N fertilizer applied in early growth stage to panicle-and-spikelet N fertilizer applied in late growth stage showed that there existed significant possitive correlation between the ear-bearing percentage (EBP) and panicle quality (PQ) of tillers formed both in seedling bed and in main field and the EBP of population; and the EBP and PQ of tillers formed in main field had a greater effect on the EBP and PQ of population and a greater contribution to grain yield than those of tillers formed in seedling bed did. It was also indicated that to increase the EBP and PQ of population and grain yield must increase the EBP and improve the PQ of tillers formed in main field on the basis of raising healthy seedlings. The optimum ratio of N fertilizer applied in early growth stage and in late growth stage was 6∶4.更多还原