Effects Of Different Rainwater Storage Methods On Lettuce Growth

The research was to explore the effects of nutrient solution using rainwater storaged bydifferent configurations on growth, physiology, quality and other aspects of lettuce, and topromote the collection and utilization of rainwater in northwest arid regions and theory to beunderstood. In this experiment, it adopted American Speed lettuce as test material in sandculture with potted way, through nutrient solution to supply plant nutrition and water. Thewater using for nutrient solution configuration was divided into three treatments: tap water,rainwater stored indoor sealed from light, rainwater stored outdoor in pool, each treatmentwas tested using the Japanese garden-style formulation. Various configurations of waterquality and the growth and development indicators of lettuce were measured. The resultsshowed that:1. The water quality of natural rainfall changed after the process of storage. Turbidityand EC contents decreased, but PH, phosphorus and potassium contents increased after therainwater was conserved indoor which was airtight and without light.2. Rainwater that was conserved in different ways was used as water source to makenutrient solution and lettuce was cultivated with that nutrient solution in sand culture.Rainwater that was conserved in airtight and dark indoor environment could significantlyincrease lettuce production yield. Compared with control treatment, lettuce yield increased129.03%.3. Rainwater that was conserved in different ways was used as water source to makenutrient solution and lettuce was cultivated with that nutrient solution in sand culture. Netphotosynthetic rate, water use efficiency were increased and transpiration rate was decreased.4. Rainwater that was conserved in different ways was used as water source to makenutrient solution and lettuce was cultivated with that nutrient solution in sand culture. Nitratecontent and soluble protein content were decreased and Vc, reducing sugar and soluble sugarcontent were increased for the two groups of rainfall water treatments.Conclusion: The nutrient solution made up by rainwater storaged in closed dark roomwas conducive to promot the growth, quality and yield of lettuce, which could provide atheoretical basis for the use of rainwater storage in northwest arid region and thetransformation of a virtuous cycle of ecosystem.