抛秧技术在斯里兰卡的应用研究

通过在斯里兰卡进行水稻抛秧试验，结果表明：水稻抛秧可比直播稻增产３０％以上，与移栽稻产量相当或更高；可比直播稻节省用种７８％，比移栽稻省种６１４％；还可节约除草用工８０％左右。塑料软盘播种方式以种子、细土分层撒播为好，本田经济最佳抛秧密度为５０苗／ｍ２（相当于用种量２２ｋｇ／ｈｍ２）。

A STUDY ON THE RICE SEEDLING BROADCASTING IN SRI LANKA

The rice seedling broadcasting has been widely used by Chinese farmers. In Sri Lanka, about 70% of the total extent under rice are still established by direct seeding and about 25% by transplanting. The grain yield is about 3 5t/hm 2. In order to promote the rice production and lay a foundation for the hybrid rice extent in the future, the experiment on the rice seedling broadcasting was conducted in Sri Lanka. The results were as follows: the rice seedling broadacsting not only increased the yield by about 30% over direct seedling but also saved seeds by 78% and 61 4% respectively over direct seedling and transplanting and the manual weeding time by about 80% over direct seedling. The economical optimum sowing method on the plastic plate was to broadcast seeds and soil separately in the order of 1/3 soil, seeds, and 2/3 soil. The economical optimum density of seedling broadcasting was 50 seedling/m 2 (22kg seed/hm 2).