关键词: 抛秧, 物理立苗, 影响因素

Abstract: 【Objective】 To provide a theoretical basis for improving the population starting point quality of broadcasted rice, the effects of different postures on broadcasted rice and their regulating factors were studied in this experiment. 【Method】 The effects of different postures on broadcasted rice were studied by preparing the upright seedlings, the leaning seedlings and the laying seedlings and the regulating factors of physical standing of broadcasted seedlings under the conditions involving soil preparations, broadcasting height, water depth and different soil ball rates were investigated. 【Result】 Standing and establishment of the upright seedlings came earlier than the leaning seedlings and the laying seedlings, and the upright seedlings’ biomass , N accumulation, net assimilation rate, lodging resistance and harvest yield were higher than that of the and the seedlings laying seedlings. The rate of the upright seedlings was the highest under the conditions that the soil of top 5-6 cm was soft and the broadcasting height was 3 m, which was 81%. The rate of the upright seedlings decreased gradually as water depth increased. The plastic trays with bigger hole should be chosen moderately for raising seedling and the height of seedling should be controlled at 10-16 cm when broadcasting. 【Conclusion】 The upright seedlings’ growth status at different stages was better than the leaning seedlings and the laying seedlings, and significantly better than the laying seedlings. Increasing the rate of upright seedlings resulted in the high yield of broadcasted rice effectively. Under the conditions that the soil at the depth of top 5-6 cm was soft, the broadcasting seedlings were low and broadcasting height was from 3 to 4 m, it would have the best seedling standing.

Key words: broadcasted seedlings, physical seedling standing, influence factors