Nano micro-alkaline irrigation water for controlling acid and reducing cadmium and method for irrigating rice

The invention provides nano micro-alkaline irrigation water for controlling acid and reducing cadmium in acidic rice soil and a method for irrigating rice, and belongs to the technical field of safety production of moderately and mildly polluted farmlands. Nano calcium carbonate and nano hydroxyapatite are used as main passivation materials, part of trace nano manganese oxide and nano zinc oxide are matched, the nano particles directly enter a field along with irrigation water by utilizing the suspension and dispersion characteristics of the nano particles, and the nano particles of pores (cracks and root holes) generated by draining the soil of the rice field in the early stage are directly gathered at the rhizosphere of the rice; the pH of the soil is improved, so that the Cd is prevented from being released from the soil and entering the rice body, and the Cd content in the rice is further reduced. 本发明提供了一种用于酸性水稻土控酸降镉的纳米微碱灌溉水及灌溉水稻的方法，属于中轻度污染农田安全生产技术领域。本发明以纳米碳酸钙和纳米羟基磷灰石为主要的钝化材料，并配合部分微量纳米氧化锰和纳米氧化锌，利用纳米颗粒悬浮分散