Abstract：A field experiment was conducted to study the water-nitrogen coupling effect by mulched drip irrigation on the dry matter and yield of maize. Three levels of water were set. Low, medium and high water were set according to the upper and lower limits of soil water content per cent of the field water holding capacity, i.e. low water W1(60%~80% before jointing, 55%~80% after jointing), medium water W2(65%~85% before jointing, 60%~85% after jointing), and high water W3(before jointing 75% to 95%, 70% to 95% after jointing). Nitrogen application gradients were set at 224, 270, and 330 kg/hm2 for low, medium, and high nitrogen. The suitable amount of water and nitrogen for maize mulched drip irrigation suitable for Kezuozhongqi was sought to provide a theoretical basis for corn mulched drip irrigation to achieve high yield and efficiency. The results show that in the combination of high water level and 270 kg/hm2 fertility, higher total dry matter biomass can be obtained, but the harvest index is lower than that in the combination of medium nitrogen and medium water. A higher harvest index can be obtained, which can better regulate the distribution of photosynthetic products between grains and vegetative organs; under typical local and climatic conditions, maize is grown by the mode of mulched drip irrigation to increase water and nitrogen inputs, which can increase production and have a diminishing effect on the yield. Changes in single-factor application levels resulting in changes in yield is more affected by water than by nitrogen.
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