Effects Of Alternate Micro-irrigation On Moist Soil Body And Vegetable In Greenhouse

The problem of agricultural water shortage persists.The three major problems,such as the shortage of water resources,the insufficient use of water resources,the full utilization of water resources and the pollution of chemical fertilizers and pesticides on water resources,are particularly serious.We need to take action to improve this situation and prevent the continued deterioration.How to use the minimum water use to promote the growth of crops through appropriate irrigation,and to get the highest yield while ensuring the quality of the crops,is the key point in the research of water saving irrigation technology.Alternate irrigation technology and micro-irrigation technology are two new water-saving irrigation techniques.Alternately irrigation technology can cause water deficit to reduce growth redundancy by water stress by artificial control irrigation.The micro-irrigation technology uses semi permeable membrane technology to automatically adjust to a small amount of irrigation in the field,and the two irrigation techniques are in temperature.Both greenhouse cultivation and field planting have been applied and achieved good results.Inthe experiment,the effect of the irrigation mode on the water distribution in the soil was investigated by combining the micro-irrigation with the alternate irrigation,and the effect of the irrigation method on the growth of the crop was observed to provide theoretical support for the application of this irrigation mode.Outdoor greenhouse experiments were conducted in the greenhouse.Setting 1 m,1.5 m two groups of pressure head,20 cm,30 cm two groups of micro pipe spacing,set 16 d as an alternate cycle,with conventional irrigation as the control,to explore the effect of alternate moistening irrigation on the growth and development of greenhouse vegetables and water resources utilization efficiency under different conditions.The experimental results show that the yield of plant and the growth of plant organs can be increased under the condition of saving irrigation water,and the yield of 1 m pressure head and 30 cm micro pipe spacing is the highest,and it has good water-saving effect.In the laboratory,the soil box simulation test was carried out to set up the pressure water head of 1 m and 1.5 m groups,10 cm,20 cm and 30 cm three groups.The experiment was carried out with 8 d as a test period to explore the effect of alternately moistening irrigation on soil moisture infiltration,soil moisture content and soil wetting body characteristics under different conditions.The experiment shows that the water infiltration in the soil can be inhibited by the alternate micro water irrigation.The migration distance and speed of the wetting front are positively related to the pressure head,and theshape of the wetted body section is influenced by the distance of the micro pipe.From the indoor soil box simulation test and the outdoor greenhouse planting test,it can be seen that alternately moist-irrigation can improve the water distribution in the soil,supply the water for plant growth,transpiration and photosynthesis in order to promote the growth of crop organs,promote the accumulation of crop to dry mass,and accelerate the plant.It is a water-saving irrigation method that can be applied to greenhouses planting.