Abstract:

Field experiment was conducted to study the effects of controlled-release fertilizer on potato yield, nitrogen use efficiency and economic benefit, in order to providing scientific evidence for the production and application of the special controlled-release fertilizer for potato. The results indicated that: compared with ordinary fertilizer, every index was significantly increased by the application of controlled-release fertilizer, which yield increased by an average of 8.35%, apparent recovery efficiency of applied nitrogen increased by an average of 26.75%, and the ratio of output to input increased by an average of 8.35%. Compared with convention treatment of the controlled-release fertilization, the nitrogen use efficiency and the ratio of output to input increased by the reduction treatment (80% of the convention treatment), which respectively increased by 22.43% and 13.71%. The added potassium treatment had the highest yield and the rate of increased income. Compared with other controlled-release fertilization treatment, the two indexes were significantly increased by the added potassium treatment, which respectively increased by 5.55% and 7.37%. So it was the optimal treatment based on this experiment.