Coupling Effects Of Irrigation And Nitrogen On Water Transport And Utilization In Maize Planting System

Based on the inefficiency of improving the moisture transportation and using of corn irrigation under the condition of limiting irrigation. The study has researched the influence of maize field coil from leaf potential difference, water consumption characteristics, crop yield and water use efficiency, aiming to find out the mechanism of water using efficiency, providing experimental basis for improving water efficiency under the condition of combing water and nitrogen fertilizer. The main results were as follows:1. Irrigating, using nitrogen and water and nitrogen interactions has significantly impact on soil water potential, leaf water potential, soil-leaf water potential difference. Under the same irrigation,360kg·hm-2amount of nitrogen to help maintain higher soil water potential, while soil water potential was lower than360kg·hm-2treatment when it up to540kg·hm-2; The soil water potential has a trend of first and then decreased with increasing the amount of irrigation. Nitrogen fertilization has reduced the leaf water potential under lower irrigation amount; Nitrogen fertilization has increased soil-leaf water potential difference under higher irrigation amount; Increasing amount of irrigation has increased soil-leaf water potential difference In the condition of higher nitrogen fertilizer, the soil-leaf water potential difference was not obviously under higher nitrogen fertilizer.2. Net photosynthetic rate, transpiration rate and stomatal conductance has increased with increase of irrigation. Irrigation and nitrogen fertilizer has significantly interaction effect on corn net photosynthetic rate, transpiration rate and stomatal conductance. Under the same irrigation,360kg·hm-2amount of nitrogen to help maintain higher net photosynthetic rate, transpiration rate and stomatal conductance, while net photosynthetic rate, transpiration rate and stomatal conductance has a trend of decreasing when it up to540kg·hm-2.3. Irrigation has more prominent of corn consumption than nitrogen fertilizer. In high irrigation, nitrogen has the effect of inhibition on water consumption, while under low irrigation, nitrogen has the effect of promotion on water consumption. Under the condition of higher irrigation, water consumption of N2was-0.73%-0.29%higher than N0、N1, while was prompt1.28%and0.37%than low irrigation. Increasing the amount of nitrogen fertilization can increase soil moisture, reduce soil evaporation, improve crop water consumption; Evaporation, soil moisture and water consumption has increased with the increasing in the amount of irrigation. Water consumption and soil-leaf water potential difference showed a positive correlation.4. The method of combining water and nitrogen fertilizer can increase corn production, and has a significant interaction effect on yield; Increasing the amount of irrigation and increasing nitrogen content can improve corn yield, but as irrigation and nitrogen fertilization increasing, increase range decreases.Nitrogen fertilization has more significantly affect than water consumption of corn biomass.360kg·hm-2amount of nitrogen to help prompt HI under high irrigation, which can help to improve grain yield. Water consumption has significantly effect on HI. Yield and soil-leaf water potential difference showed a positive correlation.5. Both the irrigation and nitrogen could affect the WUE, and has significant interaction effect on WUE. Increasing nitrogen can increase crop WUE. On the level of low, high and medium, the WUE of N2was increased by5.86%,0.09%,10.05%,2.25%,5.43%,-1.04%respectively than N2. Yield and soil-leaf water potential difference showed a positive correlation.