Effect of Rice Direct Seeding on Growth and Yield

In order to explore the feasibility of rice dry direct seeding technology in central area of Liaoning province, field experiments were conducted. The effect of dry direct seeding of rice(with 2BD-H10 type precision rice dry direct sowing machine) on growth, yield and economic benefit compared with those of rice seedling mechanical transplanting were studied. The results showed that, for rice direct seeding, rice growing period was shorter and rice grew faster, with the valid panicle number of 177815 hm-2higher, the panicle length of 1.1cm shorter; the grain number per panicle of 3 fewer; the seed setting rate of 1% lower, the weight ratio of grain to straw of 0.21 higher, the number of leaves per plant of 1 fewer the height equal, the valid tillering rate of only 0.57(while it is 3 for transplanting), the yields of about 9050 kg·hm-2, with no significant difference, the economic benefit of 2960 yuan·hm-2more than that of transplanting, for the cost saving in labor and water. The rice direct seeding is of higher efficiency in sowing operation. The direct seeding is a simplified technique and it is suitable for large scale production.