Abstract:

The experiment, combining field experiment and laboratory analysis, was conducted to study yield components and the change rule of Nitrogen utilization characteristic with potato variety “gram new No 1” under the condition of water and nitrogen coupling, and to identify the best water and nitrogen supply under the condition of furrow irrigation of Wuchuan areas Inner Mongolia. It indicated that increasing irrigation or nitrogen all could increase the tuber yield per plant, mainly enlarged the weight of single tuber, less affected the number of potato per plant. In low and medium moisture conditions, the yield ascended with nitrogen increasing, and in high moisture condition, it showed a single-peak curve with nitrogen increasing. Irrigation was in favor of increasing tuber yield. Nitrogen agronomy efficiency and partial productivity gradually reduced with the increase of nitrogen, while physiological utilization efficiency presented the trend of increasing at first, and then decreasing with the increase of nitrogen in high or low moisture conditions, and declined in medium moisture conditions. Both nitrogen agronomy efficiency and nitrogen physiological utilization declined with the increase of irrigation, but partial productivity increased. When the nitrogen rate was 150-225 kg/hm2 and irrigation rate was 2400 m3/hm2, both the yield and nitrogen utilization of potato were higher, and it was the suitable match for local potato plant.