| Controlled irrigation and aerobic irrigation are new hot water-saving irrigation technologies that have been popular in the field of water-saving irrigation research in recent years.Controlling the unique irrigation mode of irrigation,so that rice does not establish a water layer during the growth period,so the water-saving efficiency is significantly improved.The aerobic irrigation increases the oxygen content of the soil tillage layer,which can effectively promote the growth and development of the crop,thereby increasing the yield and quality of the crop.In the characteristics of the two irrigation modes,the experiment combines two irrigation modes and sets up four treatment methods(T1: super-microbubble aeration under controlled irrigation conditions,T2: mechanical aeration under controlled irrigation conditions,T3: Controlled Irrigation,T4: Flooded Irrigation)to explore the effects of two irrigation techniques on super rice under coordinated control.Through pot experiment,observe whether it can maintain the characteristics of its own irrigation mode and further enhance it in some aspects.The tested variety was super rice "Lingliangyou 268".The effects of aeration on the agronomic traits,physiological characteristics,root characteristics,water consumption,yield and yield characteristics of super rice under controlled irrigation conditions were studied.The research results are as follows:(1)Through the combination of controlled irrigation and aerobic irrigation during the whole growth period of rice,synergistic regulation and control,compared with T4 group can significantly reduce the irrigation amount of rice during the whole growth period,and the water-saving efficiency of T3 group in early rice is up to 14.6%;The water-saving efficiency of the T2 group in the late rice was up to 18.5%.The oxidationreduction potential of the T1,T2 and T3 groups was basically in the soil oxidation state compared with the T4 group.(2)Under the control of irrigation conditions,the oxygenation was owed to the water during the whole growth period,so there was some inhibition on the growth of the plant height.Compared with the T4 group,the final rice plant height difference: the maximum decline of the T2 group in the early rice was 5.8%,the maximum decline in the late rice T2 group was 3.1%.(3)Under the control of irrigation conditions,the chlorophyll content and photosynthetic characteristics of super rice leaves were improved compared with T4 group.Among them,leaf chlorophyll significantly improved in the early stage of rice,but the maximum increase was 35.2% in the early rice T1 group and 38.2% in the late rice T1 group.At the same time,the photosynthetic rate,transpiration rate and stomatal conductance of the leaves increased under the flooding irrigation period,and the most obvious in the heading and flowering period.The relative increase of the early rice T1 group was the most obvious,which increased by 44.9%,18.5% and 25% respectively;the relative increase of the late rice T2 group was the most obvious,increasing by 23.1%,20.5% and 13.2% respectively.(4)Under the control of irrigation conditions,the root activity,root-shoot ratio and other indicators of super rice were improved compared with those of T4 group.The root activity of the late T1 group was 44.6%,and the root-crown ratio of the late rice group T2 was higher.The final increase was a maximum of 31.5%.(5)The total yield of aerobic treatment under controlled irrigation conditions was lower than that of the T4 group,which was due to excessive water deficit,which led to a decrease in the number of tillers;the total yield of the early rice T1 group was the highest,compared with the T4 group.It decreased by 7.0%,and the total yield of T1 group in late rice was the largest,which was 2.5% lower.However,its seed setting rate,1000-grain weight and water use efficiency were better than that of submerged irrigation.The T1 group in early rice increased by 7.4%,8.4% and 8.9%,the late rice T1 group increased by 7.0%,12.8% and 14.6%. |
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