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Study on Relationship between Available K in the Soil and the Application Amount of K Fertilizer

Zhang Zili et al (Anhui Agricultural University, Hefei 230036)  
The relationship between KCl application amount (0,75,150,225,300 KClkg/hm 2)and the increasing amount of available and slowly available K researched in Shajiang black soil and yellow cinnamon soil was studied for soil culture. The results showed that the KCl application rate was extremely significantly and positively linear with the increasing amount of soil available and slowly available K. The increasing amount for soil available K by KCl application in Shajiang black soil was higher than that in yellow cinnamon soil, while the increasing amount under water culture was higher than that under dry land culture.The increasing amount of slowing available K under dry land culture was obviously higher than that under water culture in Shajing black soil. It was deduced by calculation that the medium index for soil slowly available K in two soils was 500 mg/kg.The results could be used for the direction for K application based.
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