Study on Limiting Factors of Influencing Hybrid Rice Ear and High Yield Cultival Ways

With II you No.7 as material to study the limiting factors of influencing hybrid rice earbearing and high yield cultival ways by hole application stage,hole application standard and triagle application N fertilizer.The results showed that the period before or behind seedlings number up to the most was the most sensitive period for influencing rice percentage of earbearing tiller.In all kinds of factors,light was the lead factor in this phase.The effect of increasing earbearing tiller percentage by adding nitrogen less than by improving light,increasing nitrogen could increase significantly percentage of earbearing tiller on condition that light condition of colony basal improved.Adopted triangle cultivation seedlings could improve colony basal light condition.In all,triangle cultivation seedlings and applying nitrogen at n-2 period was relatively good measures for rice production.Through these measures,seedlings became strong and number decreased significantly,percentage of earbearing tiller and number of grains per ear increased,led to increasing yield finally,but the extent of yield increasing correlated with soil fertility.