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穗的分化发育为水稻生长发育的重要阶段之一。1929年日人野口开始水稻幼穗分化的研究。嗣后我国丁颖、苏联玛德日珞娃、日本松岛等都进行过全面而详细的研究。研究表明,生长锥分化前施氮肥,增加小穗数目和减少颖花退化率及空壳率 穗开始分化后施肥也有好处。关于密度与稻穗发育的关系问题,汪向明在苏联于直播条件下观察到密植时主茎穗分化开始得稍迟,但与分蘖同时或早1—3天抽穗。在栽秧情况下穗发育与密度的关系,虽也有文献提到,但比较简单。有人认为单本植时,分蘖穗比主穗分化早,尤其是低位蘖比主穗分化早,因此肯定单本植可以提早成熟。而在不同密度和不同施肥水平下,穗的发育情况,穗分化时期的长短、迟早,主穗与分蘖穗分化的迟早,颖
Spike differentiation and development of rice growth and development of one of the important stages. 1929 Japanese Noguchi spike differentiation of young rice. Later, Ding Ying of our country, the Soviet Union Maoderrova, Songdo, Japan have conducted a comprehensive and detailed study. Studies have shown that it is also beneficial to fertilize growth cones before nitrogen fertilizer differentiation, increase the number of spikelets and reduce the rate of spikelet degradation, and the ratio of shell spikelet initiation to differentiation. Regarding the relationship between density and development of rice panicles, Wang Xiangming observed that the main stem spike differentiation started slightly later in the Soviet Union under direct seeding conditions, but heading at the same time as the tillers or 1-3 days earlier. The relationship between spike development and density in the case of seedling, although there are also references, but relatively simple. Some people think that at the time of monoculture, the tillering ear is earlier than the main ear, especially the low tiller is earlier than the main ear, so the single plantation can be prematurely mature. At different densities and fertilization levels, the development of ear, ear length, sooner or later, the sooner or later differentiation of main ear and tiller spike,