Summer Maize Growth Response Study Of Brackish Water Irrigation In Jinzhong Basin

Along with the growth of population and the continuous increase of national economy,the shortage of freshwater resources has became an inevitable trend.If the underground brackish water of shallow can be exploited,not only can ease the problem of the shortage of fresh water resources,but also can be conductive to the renewal of the underground water and the protection of the ecological environment. Thus under the studies of brackish water irrigation at home and abroad,combining with the agricultural science and technology demonstration and extension project the popularization of the brackish water irrigation technology with efficiency and safe use.Institute of resources and hydro-power research demostration base in Shanxi province,combining pot experiments with field experiments,and theoretical analysis and experimental study.On the combination of research methods,we carried out different methods to the influence on soil water and salt distribution and the summer maize growth and production,which are different recorded hydraulic filling sequence, recorded alternating sequence, different mixed irrigation methods and different irrigation water. Therefore, we came to the conclusions as follows.(1)The experiment of effect with salt stress at different stages of corn shows that with the increase of irrigation water salinity, the germination ratereduced and emergence time extended gradually. Different stages of salt tolerance index σjas follows: jointing stage>seeding stage>heading stage>filling stage. And the inhibition degree of different stages with brackish irrigation to corn growth index showed the same regular, which is jointing stage>seeding stage >heading stage>filling stage. Further more, with the increase of water salinity,the inhibitory effect became more significant. When output reached75% of irrigation water production in the whole stage, the salinity is 2.98g/l in seeding stage with brackish water irrigation,and in jointing 2.5g/l, along with the heading stage salinity of 4.13 g/l and the filling stage salinity 5.6g/l.(2)Under the condition of same irrigation water, alternative irrigation experiments showed that the water ratio at different soil depth has a similar charge. The water radio after irrigation is greater than it before irrigation.And in a growth period under the condition of irrigation water, water salinity decreased,but it increased after salt water irrigation.In joining stage and seeding stage,brackish water irrigation has a different degree of inhibition on maiza plant height,stem diameter, leaf numbers,leaf area index and dry matter quality, while the influence became weak in the late stage.(3) Under the same rotation irrigation order,different irrigation water showed that with the increase of irrigation quota. The water content increased gradually, further more the water salinity gradually decreased with fresh water,while increased with salt water irrigation. The demand of water in seeding stage and jointing stage is small, so enlarging the irrigation content has fewinfluence on early stage of the growth period. However,in late stage the water content demand increased gradually. And enlarging the irrigation content has a significant promotion to maize indicators.The final production showed that increasing irrigation water can promote the production with low extent. But if the irrigation water decreased, it would make the output fall sharply. And under the condition of brackish water irrigation, either increasing or reducing the irrigation water would lead to a sharp fall of production.The early stage of the irrigation water, irrigation water should be controlled in 50m3/亩,late irrigation water control in 60 m3/mu; When pouring salt water, irrigation water control in the whole stages in 50m3/mu.