| This thesis focuses on the sand corn drip irrigation system parameters is not clear the problem.Trough set different irrigation times and irrigation quota under maize root zone for analyze the response of space-time change law of different soil moisture content?maize's growth?photosynthetic physiological indexes and yield.And the water consumption in the whole growth period was analyzed,the simulation equations of yield between irrigation parameters?water use efficiency were given.The main conclusions are as follows:The height of maize increased with the increase of irrigation quota under the condition of 9 irrigation times;In 12 irrigation times,the proper of irrigation quota is beneficial to increase plant height,but more than 175m3/667m2(treatment of F2),the plant height of maize has not increased;The stem diameter of maize showed parabola during the growth period and the different irrigation times had great influence on the maize stem under the condition of low water treatment,but in the medium and high water treatment,the increasing of irrigation times that it is no significant effect on stem diameter of maize;Under the condition of 9 irrigation times,indicating that maize leaf area increased with the increase of irrigation quota,but more than 175m3/667m2,the leaf area of maize has not increased.Under the condition of 12 irrigation times,the leaf area of maize increases with the increase of irrigation quota.There was a positive correlation which irrigation amount?irrigation times between net photosynthetic rate?transpiration rate?PAR.Under certain irrigation amount,low water treatment could improve water use efficiency of maize leaves.With the increase of irrigation quantity and irrigation times,the water consuming intensity and water consumption of the whole growing season increased.The water consumption of different irrigation treatments in jointing stage?tasseling?silking stage?silking?filling stage period of maize accounted for 58.4%of the whole growth period,daily water consumption in the tassel?silking period to reach the maximum,the daily water consumption of each treatment in this period was 4.22mm/d?4.46mm/d?4.48mm/d?4.46mm/d?4.54mm/d?4.82mm/d.Under the same irrigation times,the increase of irrigation amount can increase crop yield in a certain range,but more than 175 m3/667m2,the yield did not significantly improve.From the point of view of yield and water saving that the irrigation system with the drip irrigation was preliminarily 175 m3/667m2 of irrigation and irrigation times was 12(W2)which yield was 1011.47 kg/667m2?water use efficiency was 2.64 m3/m667m2?irrigation water use efficiency 5.78 m3/667m2. |
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