Effects of Multi-year Fertilizer Application Based on Different Soil Types on Soil Nutrients and Distribution of Abundance and Defi-ciency—Taking the Changes in Yuzhong County from 1984 to 2021 as an Example
In order to clarify the impact of years of fertilizer application on soil nutrients and distribution of abundance and deficiency in differ-ent soil types,grey correlation analysis,regression model,and corresponding analysis method were applied to analyze the dynamic and abun-dance and deficiency level distribution characteristics of seven soil monitoring results of six soil types with large distribution area and strong representativeness in Yuzhong County from 1984 to 2021,combined with the fertilizer application rate.The results indicated that soil available phosphorus was closely related to the amount of chemical fertilizer applied.The average pH of different soil types was 8.33,indicating an alka-line level.The average of organic matter was 15.44 g/kg,which belonged to the relatively deficient level.Total nitrogen 0.99 g/kg,at a mod-erate level.Effective phosphorus 34.03 mg/kg belonged to a relatively rich level.The available potassium was 189.18 mg/kg,which belonged to a relatively rich level.The soil pH was higher in yellow soil,with a pH of around 8.42.The organic matter content in gray brown soil and ir-rigated silt soil was the highest,exceeding 18 g/kg.The total nitrogen content was highest in gray brown soil and irrigated silt soil,both excee-ding 1 g/kg.The highest available phosphorus was found in calcareous soil,with an average content of 53.07 mg/kg.The content of available potassium was higher in irrigated silt soil and loess soil,with an average content of 196.37-221.9 g/kg.According to the distribution charac-teristics of nutrient abundance and deficiency in different soil types,reducing the corresponding amount of fertilizer application(especially phosphorus fertilizer)and increasing soil organic matter through measures such as increasing organic fertilizer application,returning straw and green manure to the field are the main measures for soil quality oriented cultivation.
Soil nutrientsSoilAbundance and deficiency grade distributionCorrespondence analysis
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