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以旱育中秧龄抛秧、旱床育秧移栽、水育秧移栽为对照 ,对水稻旱长秧龄抛秧栽培生物学特性及其技术进行了研究。结果表明 :旱育长秧龄抛秧N ,P ,K吸收和干物质积累量大 ,前期、中期生长优势明显 ,单位面积容纳的穗数与颖花多 ,后期根系生长量大 ,氧化活力强 ,土壤表层 0～ 7cm分布比例高 ,根 /冠值大 ,齐穗期稻株中、下部透光率高 ,但生育进度较移栽慢 ;增加中、后期氮肥施用比例及适当加大抛栽密度 ,有利于叶面积扩展及干物质积累 ,形成更多的有效穗数 ,提高产量。本研究认为 ,适当增大抛栽密度 ,减少前期施氮量 ,提高中、后期用氮比例 ,是提高旱育长秧龄抛秧产量的重要农艺对策。
The characteristics of seedling throwing and transplanting of transplanting seedlings by transplanting and transplanting seedlings were compared with those of seedling transplanting and seedling transplanting in dry-nursery. The results showed that the N, P and K of seedling transplanted at the long seedling age had a large amount of dry matter accumulation and large amount of dry matter accumulation. The growth preponderance was obvious in the early and middle stages, the number of spikelets per spike and spikelet per unit area were large, Soil surface 0 ~ 7cm distribution ratio of high, root / crown value, at heading stage rice plant, the lower part of the light transmittance, but slower than the transplanting progress; increasing the proportion of late and late nitrogen application and cast cast planting density , Is conducive to the expansion of leaf area and dry matter accumulation, the formation of more effective panicles, increase production. This study argues that properly increasing throwing planting density, reducing the amount of nitrogen applied in the early stage, and increasing the proportion of nitrogen in the middle and late stages are important agronomic strategies to increase the seedling throwing capacity at the long seedling age.