氮肥施用技术对水稻群体的影响

Effect of the nitrogen application on the colony of rice variety

通过8个基、蘖、穗肥不同施氮比例及数量研究毕粳37号的群体。结果表明,(1)抽穗期适量的干物质积累是高产群体的物质基础。(2)适当的基、穗肥配比能极显著调控分蘖期最高苗、抽穗期群体干物积累量及有效穗,极显著提高抽穗期群体单茎重、茎鞘重/叶重比值、穗颖花数、灌浆期群体干物质生产能力和净光合产物积累量及成熟期穗实粒数。当基肥施氮比例占宜施氮量的76 5%,其余视苗情作穗肥补施时,灌浆期群体干物质生产能力、净光合产物积累量极显著提高。(3)抽穗期群体适量的干物质积累是极显著提高穗颖花数、灌浆期群体干物质生产能力、净光合产物积累量及成熟期群体穗实粒数的物质基础。(4)增加施氮量,抽穗期干物质积累量将显著增加而使群体恶化。

Studies were attempted to the quality of rice Bijing 37 colony with 8 different nitrogen rates and quantity of base manure, tiller manure, and ear manure.The result indicates that:(1) it is matter structure base of the high yield colony that fit population's dry material accumulation amount on colony heading stage.(2) it controls remarkably the maximum seed on tillering stage, population's the dry material accumulation amount on colony heading stage and effective ears, and that it increases the average weight of a stem, weight of stem/leaves, average a fringe glumeflower, population produce ability of dry material and net capacity of photosynthesis on milk stage, and average a fringe true seed, by application applicable proportion of base, fringe nitrogen, this, population's the dry material accumulation amount on the heading stage,is material basis that of remarkable increasing fringe glumeflower, that of produce ability of dry material and net capacity of photosynthesis on milk stage,that of fringe true seed on fullgrown stage.(3)produce ability of dry material and net capacity of photosynthesis had been remarkably increased on milk stage, if only the application 765%nitrogen of the base fertilizer and the other as the fringe fertilizer, 4 but increasing nitrogen, population's dry material accumulation amount had been remarkably increased on heading stage so that population would go bad.