望天田水稻中株密植技术研究

SATUDY ON MIDDLE DENSITY CULTIVATION OF RICE IN NON-IRRIGATED PADDY FIELD

通过适当增加每窝栽插苗数的中株密植技术,确定望天田深水管理的适宜基本苗。结果表明,有效穗与基本苗呈正相关关系,但穗实粒数与有效穗呈负相关关系。常规中稻金麻粘产量与基本苗拟合于Y=a+bX+cX^2曲线,以亩插基本苗12.5～15万的产量为高;中早熟杂交稻汕优64适插基本苗为每亩10～12.5万,在此范围内有效穗、穗实粒数和千粒重发展协调、产量高。金麻粘亩插基本苗12.5～15万时,基本苗占有效穗的比例为55％左右;汕优64亩插基本苗10～12.5万时,基本苗占有效穗的比例为45％左右。基本苗占有效穗的适当比例可作为不同地区确定望天田深水管理适插基本苗的参考指标。

An experiment of creasing rice transplanted number per bunch, named as middle density cultivation, was conducted to identify the appropriate essential seedling rate in deep water in non-irrigated paddy field. The result showed that the effective ear was correlated with the actual kernel and the essential seedling, while negative correlation had been observed between the actual kernel and the effective ear. The relaton of yield and essential seedling rate followed the type of curve as Y = a + bX +cX2, higher yield was produced when the essential rice transplanted rate was in the range of 12.5-15 ten thousand per mu in normal middle-rate rice variety Jinmazan. The appropriate essential rice transplanted rate of Shanyou 64, a middle early ripening hybrid variety, was in the range of 10-12.5 ten thousand per mu. Effective ear, actual kernel and thousand kernel weight can develop coordinately, higher yield can produce in its apporpriate rice transplanted rate.The proportion of essential rate to effective ear was about 55% and 45% separately in these two varieties when the apporpiate proportion of essential seedling rate to the effective ear can be used for reference in different area to identify the appropriate essential rice transplanted rate in different area to identify the appropriate essential rice transplanted rate in deep water in non-irrigated paddy field.