Abstract:

The greenhouse soil in Sucheng District was sampled, determined and analyzed, and the main obstacle factors of soil nutrient pollution were identified. The formula of balanced fertilizer was designed according to soil nutrient deficiency, and the effect of balanced fertilizer application on crop yield and quality improvement and elimination of soil pollution was studied. The results of laboratory analysis and field test showed that: (1) the organic matter content and available phosphorus level of representative greenhouse soils in this area were generally low; secondary salinization existed in some soils, and the content level of available nitrogen and available potassium in soils were generally high, but the variation was large, and a few parts still had the problem of insufficient supply of nitrogen and potassium; (2) the content of water-soluble salt in soil varied greatly, high concentration led to salinization of soil, while low concentration led to the failure of soil nutrient supply intensi ty to meet the basic needs of crop growth; the water-soluble K⁺/Mg²⁺in some soils was relatively high, the K⁺/Mg²⁺in some soils was relatively low, and Mg²⁺/Ca²⁺ in most soils was seriously low; (3) balanced fertilizer prepared according to soil nutrient and salt condition could promote high yield and quality of crops and reduce soil pollution load, and the treatment effect of 450 kg/hm² was more prominent.

Key words: soil barrier, nitrogen pollution, salt, balanced fertilizer, muskmelon