Commercial organic-inorganic compound fertilizer is a powerful measure for combined application of organic-inorganic fertilizers and will promote mo.

Compared with the single application of organic fertilizer and combined application of organic and inorganic fertilizers,the single application of inorganic fertilizer could increase the nitrate content of spinach.

Discussion on technique for formula fertilization and agrochemical service by fertilizer enterprises;

The 3414 test of rice formula fertilization with soil test in percogenic purple mud field has been studied in Dazhou City, the results indicated that, rice yield had a high positive correlation with fertilization amount, the correlation between nitrogen and yield was the best, phosphorus and potassium took second place.

The soil obstacle factor, the critical values of some nutrients and the supply intensity, as well as fertilizer efficiency should be paid more attention in formula fertilization by soil testing.