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高产水稻生育与季节的良好同步,其根本意义在于将抽穗结实期安排在最佳季节里,因而不同类型品种即依据其当地最佳抽穗期确定适宜播种期。播期确定后,秧龄的长短为前茬的早迟等所决定,所以生产上所需的秧龄是不一致的。根据我们研究,凡能保证移栽后正常发根活棵,且在拔节前至少长出三叶以上的秧苗均属适龄范畴。4.5叶是各类品种拔秧移栽的适宜起始叶龄,而最大适龄各品种类型均可用通式
The fundamental reason for the good synchronization between high-yielding rice and the seasons is that the heading and setting stages are arranged in the best seasons. Therefore, the different sowing dates are determined according to their best local heading date. After the sowing date is determined, the length of the young seedling is determined by the lateness of the previous crop, etc. Therefore, the seedling age required for production is inconsistent. According to our research, any seedling that can guarantee normal rooting after transplanting and grow at least three leaves before jointing is of appropriate age. 4.5 leaf is all kinds of varieties of seedling transplanting appropriate starting leaf age, and the maximum age of various types of varieties are available formula