Characteristics of K uptake by spring corn and its yield response to different K fertilizer treatments on slope land of Guangdong

In view of the problem that soil potassium level on the dry slope land of Guangdong is low, and its potential capacity of providing potassium is bad, the paper deals with the characteristics of K uptake by spring corn and the technique of applying fertilizer on dry slope land.It is found that the absorb amount to potassium of stem is the largest, reaching over 55% of that the total absorb amount to potassium of plant; the absorb amount to potassium of seed is the second place, reaching 18.51%-24.81% of that the total absorb amount to potassium.The absorb amount to potassium in the seedling stage is comparatively little, not reaching 1% of that the total absorb amount to potassium; the absorb amount to potassium in the booting stage not reaching 35% of that the total absorb amount to potassium.When the amount of applying potash fertilizer is low, applying potash fertilizer may remarkably lift the absorb amount to N and P_2O_5 of the spring corn; when the amount of applying potash fertilizer is middle, applying potash fertilizer may lift the absorb amount to N and P_2O_5 of the spring corn too; when the amount of applying potash fertilizer is high, applying potash fertilizer may remarkably decrease the absorb amount to N and P_2O_5 of the spring corn.The statistical analysis has been underway against the amount of applying potash fertilizer and the yield of the spring corn, and fixed the largest amount of applying potash fertilizer, moreover summed up the technique of applying potash fertilizer for high yield of the spring corn.