河套灌区春小麦与向日葵套种模式下水分利用效率评估

Water Use Efficiency Evaluation of Wheat Intercropping Sunflowers in the Hetao Irrigation District

以河套灌区春小麦套种向日葵田间实测资料为基础,讨论了灌水与小麦套种向日葵总产量的关系,根据实测数据,拟合了春小麦套种向日葵水分生产函数模型,通过对耗水资料的分析整理,揭示了春小麦与向日葵套种模式下需水规律及水分利用效率。通过对河套灌区春小麦套种向日葵水分生产函数及灌水边际效益的分析表明,水资源投入的最佳效益点并非产量最高点和水分利用效率的最高点。合理利用小麦套种向日葵水分生产函数及其规律,可以实现小麦套种向日葵节水、高产、高效的较好统一。

Based on the data obtained in wheat intercropping sunflower field,this paper discusses the relations between the irrigation and crop production of wheat intercropping sunflower.In accordance with the data available and the principle of least squares method,the model of water production function is fitted.Through an analysis of water consumption data,this paper reveals water use efficiency and water requirement discipline.Through the water production function and irrigation marginal benefit analysis of wheat intercropping sunflowers,this paper shows that the best efficiency point of water resources input is not the highest point of water use efficiency and crop production.The rational use of water production function and law of wheat intercropping sunfloweer can realize water-saving,,,high yield and high efficiency of wheat intercropping sunflower.