主要栽培措施对水稻环境敏感期分蘖芽的影响

Effect of main cultivative measures on the tiller bud of rice at environment sensitive stage

1996～ 1 998年以Ⅱ优多恢 5 7为材料 ,研究了移栽、深水、施氮与水稻环境敏感期分蘖芽生长的关系。结果表明 :( 1 )秧苗移栽期叶龄分别与秧苗带蘖死亡率和处于环境敏感期叶位分蘖芽的出鞘期呈极显著负相关关系 ,冬水田秧苗最适宜移栽叶龄为 5 8叶左右。 ( 2 )深水处理 3天以上秧苗处于环境敏感期叶位的分蘖发生率为 0 ,移栽返青期以灌浅水为宜。 ( 3)深水控制环境敏感期叶位分蘖芽的效果与本田底肥施氮量呈极显著负相关关系 ,每公顷施纯氮 95kg以内深水控苗效果极佳。

During the 1996 to 1998,the relationship between transplanting,deepwater,N application and growth of tiller bud of rice at environment sensitive stage were studied with rice variety Ⅱ You 57 as material.The results were as follows:(i)there were significantly negative correlations between leaf ages at the day of transplanting and tillering mortality,main stem leaf ages when the tillering bud of the leaf position at environment sensitive stage stretched out of main stem leaf sheath.Optimum leaf age for seedling transplanting was about 5 8 leaves;(ii) the tillering rate was 0 when the leaf position at environment sensitive stage under deepwater condition over three days,and suitable irrigation depth of the paddy field was about 3 5cm after the seedling were transplanted for one to seven days;(iii)before the seedling were transplanted,highly significant negative correlation between the effect of deepwater control on tillers and the amount of N application were observed.Before the seedling were transplanted,the suitable amount of N application was below 95kg/ha.