| For the water shortage and the problem of low fertilizer use is currently potato production, this comparison test by the same total amount of irrgation, the irrigation frequency and different combinations of different irrigation time Irrigation under potato growth and development, yield formation, water use efficiency and Effect of soil water and nitrogen transport, to clarify the relationship of irrigation in soil moisture and nitrate and potato growth,yield and quality, in order to determine the potato water-saving irrigation system of uniform and high yield (irrigation period, irrigation frequency) and the prevention of soil nitrate contamination of groundwater seepage leaching shift provide a theoretical basis and technical guidance.1. Under different imgation frequency and irrigation during the combination, by Drip Irrigation potato field plant height, stem diameter and dry matter accumulation amount of change in the S-shaped stem showed a trend, leaf area index showed a single peak curve trend, dry matter accumulation in plant height, stem diameter and stem, and leaf area index were 65d reaches a maximum value after emergence, tuber dry matter accumulation reaches maximum amount of harvest.7 In this test, irrigation water and irrigation period B1 is the best combination of the composite indicator.2. The overall performance of the potato in each growing period of 0-40cm soil moisture content of the soil moisture is greater,40cm-80cm soil moisture is more active,100-120cm soil moisture content is relatively stable. Single Irrigation and less irrigation times more processing, deep into the soil moisture less, the opposite is the deep soil moisture significantly higher. Potato roots on soil moisture absorption range of up to 80cm-100cm soil depth. Irrigation water 6,7 maximum utilization of water treatment, in combination with different irrigation periods B1 combination water use efficiency is the highest.3. With the promotion of potato growth period, the leaf MDA content showed increasing trend, the content of Pro decreased,70d tended to be stable after the emergence of SOD,50d content reached the maximum value after the emergence, and then decreased gradually. Irrigation MDA, Pro, SOD content of no significant impact. In this test, A2 (6 irrigation water), A3 (7th irrigation water) and the B1 level of irrigation during the combination plants by soil water stress lightest.4. Drip Irrigation under potato field in 20-60cm soil nitrate content in soil with irrigation frequency and single irrigation varies, irrigation and fewer large single irrigation, soil nitrate leaching significantly shift phenomenon, and irrigation treatment more often less obvious shift a single shower. In this test, the same total amount of irrigation water, the irrigation times to small and large single sink 5 irrigation water soil nitrate leaching phenomenon most evident.5. Under the condition of the experiment, the irrigation with drip irrigation in potato field was the best of the 7 irrigation, the economic output reached 53246.4 m2/h m2, and the commodity potato rate reached 89.6%. The whole growing period was irrigated with 7 water, and the combination of different periods, the irrigation time was combined with B1.A combination of different irrigation frequency and irrigation process stages on potato starch content are not significant, but the overall performance of a small amount many times higher than the starch content of Irrigation and a lot less time irrigation treatments. |
