石灰性水稻土施用锌肥对杂交水稻生长发育的影响

Effects of Spraying Zn Fertilizers in Terra Calcis Paddy Soil on the Growth and Development of Hybrid Rice

在有效锌含量＜０．５ｐｐｍ的石灰性水稻土上于３叶期喷施０．２％的ＺｎＳＯ４·７Ｈ２Ｏ和１：２（固：液）的麦饭石浸提液，能显著提高植株全锌含量，增加ＳＯＤ酶活性，从而有效地防止早稻烂秧，提高秧苗素质，并可促进本田水稻的早生快发，克服僵苗，提高产量。

ZnSo4· 7H2O and extracting solution of Changsha medicime stone(CMS)(powder:water=1:2)were used as the two treatments of Zn fertilizers sprayed on the hybrid rice seedlings growingin the terra calcis paddy soil whose effective Zn content is lower than 0.5ppm at three-leaf stage. The exper-imental results showed that both of the treatments could increase the plant Zn content and the Cu· Zn-SODactivities very signiflcantly,and resulted in improving the cold tolerance and the qualities of the hybrid riceseedlings. It was also found that application of Zn fertilizers enhanced hybrid rice growth and development af-ter transplanted with an increase of pancile-to-tiller ratio from ranging 11.4% to 14.2%and an increase ofgrain yield from 7.5% to 8.7%.