The Analysis Of Facilities Celery That Suits Irrigation Water And Nitrogen Content In Southern District Of Ningxia

With the development of economy, facilities agriculture has been developed for a long time as a high-tech industry. With the support of government, the facilities agriculture of southern mountainous areas of Ningxia developed rapidly, the cultivation techniques inherited from traditional farming methods simultaneously which not only waste precious water resources, but also worsen the environment of facilities and lead to occurrence of pests and diseases as well as decline in production and crop quality. How to analyze facilities agriculture saving water irrigation theory and reasonable fertilization according to local soil and climatic conditions, to choose appropriate irrigation and explore the requirement rule of crop water and scientific irrigation system. Moreover, in order to provide guarantee of improving crop yield and quality as well as reducing the production cost, analyze the thermal migration law of inland water of facilities; grasp crop fertilizer rules; and apply organic fertilizer and fertilizer reasonably. The research is of great significance in the scientific and technological content improvement of facilities agricultural; development of water-saving agriculture; and achievement of high-yield, high quality and high-efficiency of facilities agriculture crop cultivation.The main conclusions are as follows:1. Under the drip irrigation ridge planting mode, thick stems present a parabolic trend according as the decreasing of irrigation water, irrigation water is the most coarse at600～800m. Under the furrow planting mode, irrigation water is the most thick at1200m3. With the increase of irrigation water, stem diameter is reduced.2. With increase of nitrogen, the SPAD values show a parabolic trend. When it is not at the least nitrogen, the highest is to530kg hm-2. Then with the increase of nitrogen, SPAD value is also reduced.3. Under the premise of applying phosphate fertilizer and potash, along with the increase of nitrogen application, celery yield increases significantly. But when the nitrogen application rate is more than640kg hm-2, the production begins to decline, and continues to use nitrogen cannot increase production. According to the principle of marginal analysis, under the test conditions, the maximum yield nitrogen application rate of the facilities of celery is640kg hm-2, and the maximum profit of nitrogen application rate is560kg hm-2.