Preliminary Study on Abundance-deficiency Index of Soil K and Recommended Potassium Fertilizer Application Rates for Grain and Forage Oats in China
To provide a scientific basis for soil testing and K fertilizer recommendation of oats,an integration method for scattered experimental data and the new applied formula based on"the method of nutrient balance and projected yield minus soil fertility yield"were employed to study the abundance-deficiency index(ADI)of soil K and the recommended potassium fertilizer application rate(RPFAR)for oats in China.The results show that the ADI of soil available K for oats in China from the first to the third level are≥258,117～258 and<117 mg/kg,respectively.The ADI of soil total K for oats in China from the first to the forth level are≥31,21～31,11～21 and<11g/kg,respectively.When the potassium fertilizer use efficiency in current season(PFUEICS)is 40%～60%and the target yields of grain oats are 1.5～6.0 t/hm2,the ranges of RPFAR for the first to the forth level soil are 0,10～60,20～120 and 30～180 kg/hm2,respectively.When the PFUEICS is 40%～60%and the target yield of forage oats is 4.5～15t/hm2,the ranges of the RPFAR for the first to the forth level soil are 0,18～90,36～180 and 54～270kg/hm2,respectively.In this study,the recommended fertilization system based on the ADI of soil K for grain and forage oats in China is preliminary established,and it lays a scientific foundation for soil testing and potassium fertilization of oats in China.
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万方数据
