Analysis of Soil Nutrient Condition in North Plain of Henan Province

In order to find out the soil nutrient condition,utilize the soil resources reasonably and guide the scientific fertilization in the north plain of Henan province,the maize yield,agricultural production condition and fertilization practice of peasants were investigated,and soil samples were tested.Soil sample assay results showed that the soil nutrient was at middling level in general,the average contents of soil organic matter,total N,available N,available P and available K were 15.54 g/kg,1.04 g/kg,63.80 mg/kg,20.72 mg/kg and 101.93 mg/kg respectively.In comparison with the results of the second soil overall survey,the soil organic matter and available P contents were improved notably by 38.75% and 55.79% respectively,while the soil available K content was decreased by 40.63%.It was necessary to apply more organic manure,popularize returning straw to soil,reduce the application of phosphorus fertilizer,supply potassium fertilizer,use crop special compound and slow/controlled releasing nitrogenous fertilizer.