灌溉定额与改良剂组合对盐碱地水稻生长与节水控盐影响OA

To address the high soil salinity and large irrigation quota issues in rice cultivation on sandy saline-alkali soils in Xingqing District,Ningxia,"the Longdao 18"variety was selected for pot experiments to explore effective ways for water-saving,salt control,and yield and efficiency improvement.Two irrigation quotas were set:W1(13 650 m³/hm²)and W2(16 200 m³/hm²),along with two organic amendments:C1("Salt-Reduction"modifier)and C2(Multi-micro diatom),with a CK treatment(irrigation quota of 21 300 m³/hm² without any amendments),making a total of five treatments.The effects of each treatment on rice growth,yield,efficiency,and water-saving and salt-controlling effects were analyzed.Using game theory for a combined weighting of the entropy method and CRITIC method,and applying the TOPSIS model for multi-indicator comprehensive evaluation,the optimal combination of irrigation quota and amendment was determined.The results showed that the optimal combination suitable for local rice was W2C1,that is,an irrigation quota of 16 200 m³/hm² with the application of the Salt Reduction Method amendment.This optimal combination achieved a yield of 9 352.53 kg/hm²,saving 23.94％of water compared to CK,while the desalination rate increased to 59.41％with stable production.Crop water use efficiency,crop water productivity,and irrigation water productivity were improved by 30.41％,28.61％,and 32.79％,respectively,compared to CK.This study provides a theoretical basis and practical reference for promoting water-saving,salt-controlling,and yield and efficiency-enhancing techniques for rice in Xingqing District.