| Water condition is the effect of cherry tomatoes, yield and quality factors, water stress can promote vegetable root development, root layer distribution depth , root volume, bleeding, root vigor index and other indicators have significantly improved for yield formation and improve the laid the foundation of matter and energy. Water stress can improve the quality of the fruit, but will affect crop yield, irrigation can increase fruit yields, but will reduce the fruit sugar, the organic acid, the soluble solid content. how to balance fruit quality and can both increase crop yield and improve water use efficiency and unit water consumption benefits,previous research has conducted numerous and pointed out that the field soil moisture holding capacity of 70-80% of the maximum crop yield, but how to carry out systematic and scientific strategy in phases so as to further enhance water yield and water use efficiency of its lack of More in-depth research. In view of this, the experiment take cherry tomatoes as the object of study, the cherry tomato of the various stages of variable fertility treatment on the yield and quality, to provide for the development of theoretical basis for rational water use patterns.Cherry tomato was studied in this paper in Institute of Soil and Water Conservation District conducted test sites, Northwest A & F University, Yangling, Shaanxi. In 2009, five soil moisture levels (soil water holding capacity, respectively) were designed as 50% to 60%, 60% to 70%, 70% to 80%, 80% to 90% and 90% to 100%, respectively signed W1, W2, W3, W4, W5 ) in experiment, the influences of tomatoes yield,fruit quality and water use efficiency in greenhouse were studied under different irrigation treatment; In 2010, By controlling the 4 stage and different soil moisture in the whole growing season(T1:D-D-D-D,T2:Z-G-G-Z,T3:Z-Z-Z-Z,T4:Z-G-Z-G,T5:G-G-G-G,T6:G-Z-Z-G ;D:50%-60%,Z:70%-80%,G:90%-100%), the influence of tomatoes yield﹑fruit quality and water use efficiency in greenhouse were studied under different change soil moisture. The field experimental was conducted during 2009-2010 using cherry tomato, by controlling soil moisture in the different growing stage, the water consumption rule, tomatoes yield, and the influence of change soil moisture in different periods on yield were studied under different irrigation treatments, and the water sensitivity index were in various stages were calculated by application Jensen model, for, fitting the cherry tomatoes moisture production function. The major results are as follows:The experimental result showed that yield and quality of processed tomato had close relation with soil moisture content, The W3 output and the moisture content use efficiency are highest, respectively is 6.70kg/m2 and 24.64kg/m3, The yield of T1,T2,T4 and T5compared to T3, decreased by 39.70%, 22.53%, 3.43% and 20.30%. Although the T3 and T4 treatments difference between cherry tomato yield did not reach significant, but the T4 water use efficiency is 19.84 kg/m3, compared to T3 water use efficiency with large difference, five treaments water use efficiency is: T3>T2>T1> T4>T5。While suitable soil moisture (70% to 80%) can not only increase tomatoes yield, but also increase water use efficiency and irrigation use efficiency, water use efficiency increased with irrigation water increased and then decreased ;in 70% to 80% treatment was the optimization.Yield and Quality of processed tomato had close relation with soil moisture content. The yield of T1,T2,T3,T6 compared to T4, decreased by 65.76%,52.02%,3.89%å'Œ13.60%; Compared with the T4 water use efficiency were reduced by 9.00%, 19.09%, 9.97%, 18.21%, 43.13%.Excessive or too low water moisture content before irrigation will affect yield and quantity indexs of lycopene, soluble solids, solube sugar, and soluble acid, T1 is the best, followed by T4 , T6 is low. Talking into account of factors above, seedling stage use 70%～80%,early fruiting period use 90%～100%,fruiting period use 70%～80%,later fruiting period 90%～100% gained the highest yield, better quality and the highest water using efficiency. So it can be realize the target of high yield, high efficiency and water saving irrigation and various indexes were significantly higher in the whole growth 70%～80% of the irrigation water.The amounts of water consumption in seeding stage was low, early fruiting period started to increase, fruiting period was the highest, later fruiting period was low. The relationship between the total yield and the total amount of water consumption was quadratic parabola, and the optimal irrigation amount was 345 mm. Water sensitivity indices went down successively from fruiting period, later fruiting period, early fruiting period to seeding stage, which was similar to the pattern of water consumption. In sunlight greenhouse, cherry tomatoes should be based on water sensitivity index variation law determine irrigation, in seedling stage and early fruiting period can moderate water control, the water supply must ensure in fruiting stage and later fruiting stage especially. To make water management more accurate, more scientific through the water control, in phases, in order to achieve the goal of water-saving efficient.Cherry tomato at different growth stages integrated water consumption, water consumption and the relationship between yield per unit area and the growth stages of water sensitive index reached the following conclusions: Cherry tomatoes in the seedling stage, early fruiting period, fruiting period, later fruiting period were to keep 70% to 80%, 90% to 100%, 70% to 80% and 90% to 100% of field capacity can be achieved saving water high production. |
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