Effects Of Different Drip Irrigation And Plastic Mulching On Photosynthetic Characteristics And Yield Of Maize In Hetao Irrigation

It is of great significance to study the photosynthetic characteristics of food crops of maize in the key growth period.Growing highly effective water-saving agriculture,applying and promoting water-saving irrigation techniques are significant means to promote the reasonable use of agricultural water resources,enhance the agricultural water resources use efficiency and achieve the agricultural sustainable development.The field experiment was conducted to study the effects of drip irrigation under mulch in different cropping patterns on photosynthesis characteristics,chlorophyll fluorescence characters and yield formation of maize.The results showed that the yields of high drip irrigation and middle drip irrigation with whole film covering are 14432.1 kg/hm2 and 15472.0 kg/hm2,increasing up to 10.3%-27.5%,significantly above the same amount of drip irrigation with half film covering.Between different film mulching and same irrigation treatment,the diurnal changes of net photosynthetic rate,stomatal conductance,transpiration rate,intercellular CO2 concentration are significant difference(P<0.05).There is no significant difference between the treatments with high drip irrigation and middle drip irrigation.The net photosynthetic rate of maize could be increased by middle drip irrigation at jointing stage.Under the same film mulching condition,the Fv/Fm and OPSⅡ are increasing by high drip irrigation and middle drip irrigation.It is in convenient for facilitating the ability of photosynthesis in mesophyll cells.