Abstract:

To find out the changes of nutrient content of field vegetable base in Tonghai County from 2004 to 2015, and provide references for rational fertilization, a comparative analysis was conducted with field sampling and laboratory testing. The results showed that in 2015, the soil pH of Tonghai field vegetable base was 7.57, with an average organic matter content of 43.8 g/kg. The effective N average content was 170 mg/kg, the proportion of field>151 mg/kg was 67.5%; the average effective P of soil was 111.2 mg/kg, and the proportion of field>50 mg/kg was 92.4%; the average effective K of soil was 194 mg/kg, and the proportion of field >151 mg/kg was 54.7%; the average exchange Ca was 19238 mg/kg, and the proportion of field>5001 mg/kg was 97.9%; the average exchange Mg was 908 mg/kg, the proportion of field >150 mg/kg was 100%. Compared with those of 2004, pH increased by 0.13, organic matter increased by 15.8%, effective N increased by 20.1%, effective P increased by 66.6%, effective K decreased by 13.4%, exchange Ca increased by 186.2%, and exchange Mg increased by 16.1%. It indicated that the nutrient concentration of soil N, P, Ca and Mg in the cultivated layer of soil in Tonghai field vegetable bases was relatively high, while the content of K was relatively low. Therefore, it is necessary to control N and reduce P, and supplement K appropriately, to balance fertilization and strictly control the use of lime in vegetable fertilization.

Key words: Field Vegetable Base, Cultivated Soil, pH Value, Organic Matter, Major Nutrient Change