Abstract:A combination method of controlled irrigation and aerobic irrigation was adopted in field experiments of super rice to improve its water use efficiency. The super rice of brand Lingliangyou 268 served as study object, and four experimental treatments were designed, namely controlled irrigation and mechanical aeration(JX), controlled irrigation and ultra-microbubble aeration(WP), controlled irrigation(CK), flooding irrigation(YS)to explore effects of aeration on physiological and biochemical characteristics and yield of the rice during its growth periods after turning green under controlled irrigation conditions. The results showed that the content of chlorophyll in leaves was not significantly different in the early growth stages(tillering stage, jointing booting stage, heading and flowering stage), but it was increased by 38.2% in maximum in the late growth stage(milk stage). The net photosynthetic rate, transpiration rate and stomata conductance were significantly improved, specially, in the early stages increased by 44.9%, 18.5%, and 25.0%, respectively, but 14.3%, 11.5%, and 22.2% in the late stage. Compared with the YS group, the root vigor rose by 44.6% in maximum, but 11.5% against the CK group in heading and flowering stages. At the same time, the soil redox potential was regularly monitored. The soil was basically in oxidation state in various growth periods after aerobic treatment under controlled irrigation conditions. Under flooding irrigation, however, the soil is essentially in reduced state in the whole growth period. The water use efficiency was improved significantly in three groups under controlled irrigation conditions, especially, the maximum water saving was up to 18.5% during the entire growth period under controlled irrigation condition with oxygenation.
胡德勇*,廖健程,陈哲,丁鑫,罗东城,游峻松. 控制灌溉增氧对超级稻生理生化特性及水分利用效率的影响[J]. 排灌机械工程学报, 2020, 38(5): 500-505.
HU Deyong*,LIAO Jiancheng,CHEN Zhe,DING Xin,LUO Dongcheng,YOU Junsong. Effects of controlled irrigation and oxygenation on physiological and biochemical characteristics and water use efficiency of super rice. Journal of Drainage and Irrigation Machinery Engin, 2020, 38(5): 500-505.