Study On The Fundamental Reaserch Of Application Technology Of Soil Testing And Fertilizer Recommendation For Maize

Fertilizer recommendation is an integrative technology, and the key technology mainly based on the connection among crop, soil and fertilizer. With the testing of soil nutrient and the fertilizer affection of field ex_amination, we can work out the relevate fertilizer parameter to guide the application on fertilizer. The ecological environment security is the comprehensive goal.Corns in Songshan district was taken as the ex_ample in this article, and superior soil fertility levels were supplied. The application of "3414" was the implementation plan. Three effect factors in fertilizer such as nitrogen, phosphorus, potassium were researched. The results indicated that:1,The nourishments of the ex_perimental soil were not balance, NK(84.75%)>NP(83.21%)> PK(64.66%)> CK(61.64%), and the degree of the element deficiency was N>K>P, and the lack of N was obviouse, and N was the limiting factor on soil nutrient currently. Therefore, the nitrogen fertilizer could increase yields most, and the potassium fertilizer and phosphor fertilizer could increase yields in some ex_tent when corns were planted in the ex_perimental soil.2,By formula making by Stanford, fertilization parameters were that: The unit absorbtion quantity of maize nutriention:Absorbtion quantities of N,P₂O₅,K₂O to maize(every 100kg) was 2.34kg,1.26kg,1.57kg, utilization of N,P₂O₅,K₂O were 37.4%,14.4%,30.99%. There was a hypo-regression relation between the supply of N,P₂O₅,K₂O from soil and the contects of nutritions.3,According to the relation between the outputs and the quantities of fertilization: The corn output could increase with the quantities of fertilization, but that would drop when the period was more than the critical value. Therefore, the crop output heights were decided by the lowest (also was the most lacks) nutrition factor, if this factor couldn't be supplyed enough, crop output couldn't be enhanced even if other factors were sufficient; and the lowest factor would be suppressed if some factor was too high, and the fertilizer effectiveness would display at the same time. The phenomenon of fertilization model was similar to some areas of China. Increasing some kind of fertilization will increase the cost but reduce the income at the same time.4,The results which the ex_periment of the fertilizer effect fitting with nitrogen,phosphorus and potassium showed that: When some element level attained the best, the best proportion to other two elements could be found, and reseached lower cost with higher income finally. Through the regression analysis to the whole statistical data, the success ratio of simulation by three factor and two factor model was: y=349.5307+11.5292x₁+5.2717x₂+10.9858x₃-0.6623x₁²-0.3669x₂²-3.1638x₃²+0.2621x₁x₂+1.9394x₁x₃-0.6228x₂x₃...