Preliminary Study on Abundance and Deficiency Index of Nitrogen,Phosphorus and Potassium for the Wheat Soil at Qingyuan in Hebei

Through wheat/corn rotation system in Qingyuan county laid the nitrogen phosphorus potassium area,the non-nitrogen area(PK),the non-phosphorus area(NK),the non-potassium area(NP) and not fat area(CK) fertilizer field tests,made sure the abundance and deficiency index of soil nitrogen,phosphorus and potassium.The results indicated that soil alkaline hydrolysis nitrogen: 60 mg kg-1 lower,60-100 mg kg-1 low,100-125 mg kg-1 middle,125-160 mg kg-1 high,160 mg kg-1 higher;available phosphorus: 11 mg kg-1 lower,11-20 mg kg-1 low,20-26 mg kg-1 middle,26-34 mg kg-1 high,34 mg kg-1 higher;available potassium: 82 mg kg-1 lower,82-109 mg kg-1 low,109-127 mg kg-1 middle,127-147 mg kg-1 high,147 mg kg-1 higher.According to established abundance and deficiency index to analyze and evaluate the status of Qingyuan soil nutrient,it was found that soil alkaline hydrolysis N in the country was in low level,available P was in high level in the south and north area,in low level in the middle area,available K is in middle-low level.The results which formula fertilization by soil testing of the country showed that formula fertilization could improved the yield 6.2%-8.5%,wheat yield was significantly increased in low level yield fields,followed by middle level yield fields,and wheat yield was at least increased in high level yield fields.