| Popis: |
To determine the influence of controlled release fertilizers on the yield components of cotton and soil properties, a two-year field experiment was conducted with four treatments:Conventional fertilization, which was urea applied as basal fertilizer (CK); Twice-split applications of urea fertilizer (CU); Controlled release urea as base fertilizer application (CRN); Controlled release urea and controlled release potassium chloride as base fertilizer application (CRNK). The release period of polymer coating of sulfur-coated urea, polymer coated urea, and polymer coated fertilizers potassium chloride in the field was 65, 86, and 82 days, respectively, and the one-time base application could supply the nutrient demand of cotton throughout the growth period. Compared with CK, CRN and CRNK treatments increased cotton single boll weight and boll number, respectively, significantly increased yield by 15.0%~20.1% and 22.1%~23.3%, and improved economic benefits by 44.9%~59.4%; Compared with CU treatment, CRN and CRNK treatments significantly increased the lint yield by 9.3%~13.7% and 12.1%~21.9%, respectively, and improved economic benefits by 36.3%~49.9%. However, there was no significant difference on the yields of lint cotton between CRNK and CRN, but the lint yield of CRNK increased by 2.5%~7.2% compared with that of CRN. Compared with CK treatment, CRNK treatment significantly increased the contents of nitrate nitrogen and available potassium 38.5% and 8.9% in soil of 0~20 cm at harvest time, and the elongation rate was significantly increased by 10.0%~11.6%. Compared with conventional fertilization, controlled release nitrogen fertilizer and controlled release potassium fertilizer could significantly increase the boll weight and bollforming number of cottons by increasing the contents of nitrate nitrogen and available potassium in soil, improve cotton fiber quality and soil potassium supply intensity during harvest, save time and labor, and increase economic benefits. |
