早种早发是争取早稻高产的一项重要措施。上海郊区绿肥茬早稻移栽后,一般三十天左右发好棵。这时,分蘖多为有效的,成穗率高。但有时也会出现插秧早而不发或晚发的现象,造成早熟品种过早孕穗拔节,穗小粒少,晚熟品种推迟成熟,影响产量。去年我县四月底五月初移栽的早稻,部分田插秧后二十天还未发棵,有的烂根,死苗。 Early planting is an important measure for early high-yielding rice. Shanghai suburb green manure stubble after transplanting, generally about thirty days made a good tree. At this time, tillers are mostly effective, into a high rate of spike. But sometimes there will be no early or late rice transplanting phenomenon, resulting in precocious precocious varieties of early jointing panicles, small spikelets, late maturing varieties delayed maturity, affecting the yield. Last year, the county early April early May transplanted early rice, some fields after transplanting twenty days have not yet been planted, and some rotten roots, dead seedlings.