Effects of different transplanting density combinations on growth and yield of machine-transplanted rice huaidao 5.

With mid-season japonica rice cultivar huaidao5 as material,the effects of different transplanting density combinations on the characteristics of growth and yield formation of the Machine-transplanted rice were studied.The result showed as follows: Reduction of the density can strengthen the single productive forces,enhance the number of the ears and economical output of the single plant,enlarge the ear panicle,increase the length of the ear,increase the number of seeds of the ear,increase the grain weight and the grain-filling rate,shortens and strengthens the stem,strengthen the lodging resistance ability,alleviate the increase and decrease of the stems and tillers,raise the rate of ear-bearing.Reduced density,however,has some short comings,for instance,the number of stems and tillers is insufficient,the LAI and the biomass accumulation are