%0 Journal Article %A CUI Zhengjun %A GAO Yuhong %A YAN Bin %A WU Bin %A NIU Junyi %A ZHAO Bangqing %A ZHAO Yongwei %A LI Ying %T Effect of Water and Nitrogen Coupling on Spatial and Temporal Distribution of Soil Water and Water Consumption Characteristic and Grain Yield of Oil Flax %D 2019 %R 10.11869/j.issn.100-8551.2019.02.0398 %J Journal of Nuclear Agricultural Sciences %P 398-411 %V 33 %N 2 %X In order to clarify the effects of water and nitrogen coupling on water consumption characteristics of oil flax in typical semiarid gully area of Loess Plateau and select the suitable local irrigation amount and fertilization application rate, the field experiment was conducted. The effects of water and nitrogen coupling on water use characteristics at different growth stages, grain yield, and water use efficiency of oil flax were studied by three-factor split. Two species of Lunxuan 2 (V1) and Dingya 22 (V2) were selected as the main area, three irrigations of 0 (W1), 1 200 (W2), and 1 800 m3·hm-2 (W3) were set as the sub-area, and three nitrogen fertilizer gradients of 0 (N1), 60 (N2), and 120 kg·hm-2 (N3) were the secondary sub-areas. The results showed that the irrigation amount and nitrogen rate mainly affected the soil water content above 100 cm soil depth, indicating that W3 was higher than W2 and W1, and N3 was higher than N2 and N1. The average soil water content of W3 in the 0~100 cm soil layer during maturity was 9.04% and 30.93% higher than W2 and W1, respectively, and N3 was 5.96% and 9.68% higher than N2 and N1, respectively. The variety, irrigation and nitrogen fertilizer significantly affected yield. The yield of V2 increased by 8.94% compared with the yield of W3 and W2 increased by 40.35% and 27.42%, respectively, compared with W1, and the yield of N3 and N2 increased by 13.86% and 8.50%, respectively, compared with N1. The interactive effects between water and nitrogen, variety and water, and variety and nitrogen were significant (P<0.01), however, the interactive effects among variety, water and nitrogen were not significant. The agronomic utilization efficiency decreased with the increase of irrigation amount and nitrogen application rate, the partial productivity increased with the increase of irrigation amount, and decreased with the increase of nitrogen application rate. These results suggested that selecting V2 with 1 800 m3·hm-2 irrigation amount and 60 kg N·hm-2 nitrogen fertilizer in test region was the best choice, which can increase grain yield and improve soil moisture absorption of oil flax in dryland. The results provide a theoretical basis for high-yield and high-efficiency cultivation of oil flax. %U https://www.hnxb.org.cn/EN/10.11869/j.issn.100-8551.2019.02.0398