目前在湘鄂川黔边境的武陵山区,杂交稻作单季中稻栽培,发展迅速,对提高水稻产量和解决粮食问题起了重要作用。然而对育秧技术尚缺乏系统的研究,技术改进较慢,秧田播种量带有一定的盲目性,更有甚者,有些地方还在沿用常规中稻的老水秧田育秧,播种量较大,且不分茬口迟早播种量“一刀切”,栽插时秧龄也普遍偏短等。难以育出杂交中稻高产要求的多蘖壮秧。本试验的目的,是从探求个体与群体的矛盾着眼,设计不同的秧田播种量,重点考查秧苗分蘗的发生、停止和死亡的日期,个体器官的建成以及最大载苗量构成的各项指标,为培育适合杂交中稻高产的多蘖壮秧,提供理论和实践依据。 At present, in the Wuling mountainous areas along the borders of Hunan, Echu and Qian, the hybrid rice is cultivated and cultivated rapidly in single season, which plays an important role in raising the yield of rice and solving the grain problem. However, there is a lack of systematic research on seedling raising techniques, slow technological improvements and some blindness in seedling planting rates. What is more, some places are still growing seedlings of old water-seedling basing on conventional medium-sized rice, Crop sooner or later seeding crop “across the board,” planted seedling age is also generally shorter and so on. It is difficult to breed more tillering seedlings with high yield of hybrid mid-season rice. The purpose of this experiment is to explore the contradiction between individuals and groups, to design different seeding sowing rates, with emphasis on the occurrence of tillering of seedlings, the date of cessation and death, the establishment of individual organs and the maximum quantity of seedlings formed, In order to cultivate more tillering seedlings suitable for high yielding mid-season hybrid rice, it provides theoretical and practical basis.