| This experiment use the method of orthogonal test and contrast test to study the optimal combination of anti-seepage, water quality and irrigation quota,study the influence on yield and quality of use different water irrigation on tomato and watermelon of non cultivated land in greenhouse in Ningxia. Results show that:1. Optimal combination test of the anti-seepage, water quality and the irrigation quota. The important rank of three factors is anti-seepage measures(primary)> irrigation quota>water quality. Clay seepage was benefited for early vegetative growth of tomato and watermelon; Plastic film seepage could increase the photosynthesis, compare with clay seepage, the yield increased by17.44%and4.72%,water retention was good, raised the0-40cm of soil moisture content, improved the fruit quality of tomato and watermelon.Irrigation quota was the main factor of affecting the yield and water use efficiency of tomato and watermelon. Small irrigation quota than large irrigation quota water use efficiency increased by26.92%and32.24%,Watermelon small irrigation quota yield is10.10%higher than that of large irrigation quota norm. The irrigation water quality and irrigation quota on yield was not significant. The optimal combination of the three factors was A2B1C1, that the use of brackish water mixed with purified water seepage irrigation under plastic film, when irrigation quota was284m3/667m2(tomato) and117m3/667m2(watermelon)as the best irrigation system.2. Different water irrigation experiment2.1Long term use of brackish water irrigation could inhibit vegetative growth of tomato and watermelon, have an adverse effect on the morphology and Photosynthesis of plants of tomato and watermelon.But could improve the content of soluble sugar and soluble solid, reduced the content of organic acid improved the sugar acid ratio in fruit, suitable for high quality tomato, watermelon production.2.2Purifying water irrigation could improve water use efficiency of tomato and watermelon,0-40cm soil electrical conductivity was lower, but the fruit quality was poor, the high cost of production.2.3According to the growth stage of salt and fresh water irrigation and according to the order of rotation irrigation could reduce the salt content of soil by leaching, increased leaf photosynthesis, but the yield and water use efficiency was low, the general quality,could maintain the root distribution of dense layer of soil electrical conductivity stability.2.4Salt water1:1mixed irrigation could greatly increase yield of tomato and watermelon, fruit quality was good, the production cost decreased by50%compared with the clean water irrigation. Could be used as tomato, watermelon brackish water purification using mode irrigation best, could be generalized in brackish water area of tomato and watermelon planting. |
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