Effects of Long-term Fertilization on Potassium Q/I in Cropping Maize

doi:10.7668/hbnxb.2018.05.025

Abstract

Abstract: In order to understand the effect of long-term fertilization on the dynamic balance of potassium nutrients in black soil corn fields. We based on the long-term fertilization experiment (1984-2015) in black soil corn field,the effects of different fertilization treatments on the characteristics of Q/I curve and the parameters (potassium supply capacity,potassium supply potential and potassium buffer capacity) of black soil in maize field were studied. The results showed that long-term different fertilizer treatments of black soil potassium Q/I curve and typical Q/I curve was similar. Q/I curve among different fertilizer treatments presented a similar shape. It consisted of two parts:curve and straight line. Fertilization could increase in the black soil-ΔK₀ value and ARe_K value,reduced the black earth PBC_K value,treatment of NPK with high straw content (NPK+S_0.5) black soil-ΔK₀ value of up to 0.167 9 cmol/kg,ARe_K value was also the highest under NPK+S_0.5 treatment 1.718 5×10^-3(cmol/kg)^-1/2.However,the PBC_K value was the smallest,which was 97.7 (mg/kg)/(cmol/kg)^1/2. Applying potassium fertilizer and straw was more effective in increasing the-ΔK₀ and ARe_K values and decreasing the PBC_K value in the corn field soil. The correlation analysis showed that there was a significantly positive correlation between black soil-ΔK₀ and ARe_K values and soil organic matter,total nitrogen,total phosphorus,total potassium,and available potassium content (P <0.01),and PBC_K values were exactly the opposite. In general,chemical fertilizers combined with straw had a great influence on the physicochemical properties of the soil and the-ΔK₀ value,ARe_K value and PBC_K value. It could not only increase soil nutrients,but also increase soil potassium supply capacity. Therefore,reasonable fertilization will help increase the supply capacity of soil potassium nutrition and increase crop yield and quality.

Key words: Long-term fertilization, Corn field soil, Q/I characteristics, Potassium supply capacity

CLC Number:

WU Junnan, LIU Yuxin, WANG Tianye, GAO Qiang, WU Haiyan, LIU Shuxia. Effects of Long-term Fertilization on Potassium Q/I in Cropping Maize[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2018, 33(5): 181-187. doi: 10.7668/hbnxb.2018.05.025.

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