水稻蘖位优势的形成规律与高产利用研究

Formation of the Superiority of Rice Tillering Positions and Its Utilization for High Yield

对水稻主茎不同蘖位上分蘖成穗后的穗粒数变化情况的分析结果表明，随主茎第一蘖位向上移动，蘖位优势呈现出由强→弱→强→弱的变化规律。当一个主茎蘖位上利用一个一次分蘖和两个二次分蘖成穗时，优势蘖位的上限为主茎叶片数减去１０，利用一个一次分蘖成穗时，优势蘖位的上限为主茎叶片数减去７。在相同密度条件下，利用中位蘖栽培，能提高每穗粒数５．４４％以上，表现出具有较大的增产潜力。

The result of analysis for grain number per ear at the different tillering positions on the rice plant showed that strong and weak superiorities of tillering positions alternated in developmental cycles,as the first tillering position on the main stem moved up.The superior tillering position was equal to the total number of leaves on the main stem subtracted by the number of 10 when one of the primary tillers and two of the secondary tillers bore ears.The superior tillering position was also equal to the total number of leaves on the main stem subtracted by the number of 7 when one of the primary tillers bore ears.The intermediate tillers could increase grain number per ear by over 5.44% at the same planting density.This indicates that it has a great potential for increasing yield.