To explore high-yielding cultural techniques of ratoon rice with machine harvest and observe on growth characteristics of ratoon tillers, the combination tests of different nitrogen application time were set. The results showed that the main tillers located at the second and third node order in ratoon season with few total leaf number, no independent root, early breeding and early maturity after the main rice was harvested by hand in high cutting. While the main tillers located at the fourth and fifth node order in ratoon season with more total leaf number and independent root after the main rice was harvested by machine in low cutting. After machine harvest 7?0d, nodal root and tillers germinated at prophyll node. After machine harvest 9?2d, the first panicle branch differentiated. The heading and ripening stage delayed about 15d than that of the field which the main rice was harvested by hand in high cutting. After the main rice was harvested by machine, early and heavy application of N-fertilizer effectively promoted root, bud germination and branch, spikelet differentiation of ratoon tillers, which can increase yield significantly.%为探索机械收割的再生稻高产栽培技术,观察再生分蘖生育特性,设置氮肥施用期组合试验.结果表明:头季高桩手割,再生季主体分蘖为倒2、3节位分蘖,总叶数少,无独立根系,早育早熟；头季低桩机割,再生季主体分蘖为倒4、5节位分蘖,总叶数多,有独立根系,机割后7～10 d开始在前出叶节萌发节根和子蘖,9～12 d分化1次枝梗,抽穗、成熟期比头季高桩手割田推迟15 d左右.在头季机收后早施重施氮肥,能有效促进再生分蘖根芽萌发和枝梗颖花分化,增产显著.
展开▼
