Effect of Integration of Water, Fertilizer and Soil Amendment on Cotton Yield Improvement and Soil Salt Control

【Objective】 This project aims to study the effect of increasing the application of soil amendment on cotton yield and soil salt control in saline-alkali soil on the basis of drip irrigation and fertilization under the integrated film of field water and fertilizer.【Method】The experiment was carried out in Shawan County in 2017. There were five fertilization treatments in the experiment: control (no fertilization), conventional fertilizers, conventional fertilizers + soil amendment, special fertilizers and special fertilizers + soil amendment. Each treatment was repeated 3 times and set in a randomized block in the experimental plot. The determinant indicators were cotton yield, dry biomass, soil pH and soil conductivity.【Result】The conventional fertilizers + soil amendment was the best. The average effective bolls were 6.8 per plant. The average single boll weight was 5.95 g, and the cotton yield was 6,640 kg/hm²,which was 17.4% higher than that by conventional fertilizers treatment. Soil amendment could reduce soil pH. Soil conductivity at 0 cm from the dripper was lower than that at 30 cm, indicating fertigation was effective for washing salt. 【Conclusion】The addition of soil amendment can increase effective cotton bolls and promote boll weight, and can effectively increase cotton yield and reduce soil pH to improve soil environment.