关键词: 限量标准, 限量标准

Abstract:

In order to find out the influence of the water-soluble slow-release fertilizer which is suitable for semi arid climate conditions (made by Beijing Academy of Agriculture and Forestry, called W, similarly hereinafter), study on the growth of summer maize under the condition of conventional irrigation and reduction irrigation. Application of sandy loam soil potted corn test, set up 5 different processes: the conventional irrigation with no fertilization (CK), conventional irrigation urea treatment (N), the conventional irrigation with L type coated urea fertilizer processing (L), amount of fertilization and conventional irrigation micro water soluble fertilizer processing (W1), fertilization and irrigation amount reduced slightly water soluble fertilizer treatment (W2). The test results showed that, compared with conventional irrigation fertilization compared to N increased the content of 4.4%-30%, increased the content of plant K 1.7%-19.3%, the content of ammonium nitrogen in soil to improve 26.3%-54.2%, nitrate nitrogen content increased 3.36 times to 5.39 times, increased the content of 67.6%-201% available K. All fertilizer treatments of total nitrogen and potassium content in soil residual nitrate nitrogen and potassium contents were significantly improved. Fertilization compared (big trumpet period), the total nitrogen: maximum value was 2.37%, the minimum value was 1.98%, the order of the number of content was W2 > W1 > L > N, W2 and N had significant difference, other treatment had no significant difference; plant potassium: maximum value was 4.84%, the minimum value was 4.26%, the order of the number of content was W1 > W2 > L > N, the difference was not significant; soil nitrate nitrogen maximum value was 314 mg/kg, the minimum value was 165 mg/kg, the order of the number of content was W2 > W1 > L > N, W2 and W1, N, L three treatment had significant difference, other processing the difference were not remarkable. The soil available K maximum value was 318.1mg/kg, minimum value was 231.7 mg/kg, the order of the number of content was W2 = W1 > N > L, W2 and W1 had no significant difference, N and L had no significant difference, other differences between the treatments were significant difference. This showed that, slightly water soluble fertilizer nutrient release had a slightly water soluble and slow release performance, significantly improved maize plant nitrogen absorption, reduce leaching risk.