优质早籼舟903抛秧栽培产量相关因子研究

Studies on relevant factors of yield of quality early indica rice Zhou 903 transplanted by seedling cast

优质早籼舟９０３ 采用抛秧栽培具有促蘖争多穗创高产的优势， 但同时也存在着易倒伏的威胁。通过１９９６～１９９８ 年３ 年共３６ 块典型抛栽田块的调查和分析， 结果表明： （１） 在构成其产量的诸因素中， 单位面积有效穗数的直接作用最大； （２） 施肥对产量直接作用的大小顺序为钾肥＞ 有机肥＞ 氮肥＞ 总肥量＞ 磷肥。

Under conditions of rice seedling transplanted by casting,the quality early indica rice variety Zhou 903 had an advantage of high yielding resulted from more tillers and spikes,but it easily lodged.A 3 year investigation was conducted in 36 typical paddy cultivated the variety by cast transplant during 1996 1998.Results of the observation and statistics showed that in factors forming its yield,productive tiller number had the largest direct effect,and that the direct effect of fertilization application on yielding was arranged in the following order:K fertilizer >organic fertilizer>N fertilizer>amount of fertilizer applied>P fertilizer.