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.

Sugarcane Nutrition Requirement and Balanced Fertilization Methods;

Construction of mathematic model for solar greenhouse cucumber balanced fertilization in the sandy land;

This experiment adopt three factor five level quadratic component rotational design to research the effect of the economic traits of bitter gourd by nitrogen, phosphorus and potassium balanced fertilization.

Different density and fertilizer ratio can affect yield of spring wheat qreatly,our study draw the following conclusions:(1)in the range from 3,750,000 hm -2 to 6,000,000 hm -2 ,the yield of spring wheat did not change significantly,so we can properly decrease the density of Long Fu 91-B569.