The soil is water plant by sucking water up to the rakphuettham functions, or as a component in the plant in order to maintain the balance of plant water loss by dehydration to the atmosphere through the mouth. Therefore, it's important in the stoma to control the water level in the plant. While the stoma opening is to remove carbon dioxide used in the process of photosynthesis, but if the soil is dry, water plants cannot suck normally. The plant will have to adjust the water level, close the stoma to maintain in a plant cell can be security-. From this relationship, it is necessary to have education in soil and in plants (sayan, 2534 (1991))
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