| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem in that by a conventional watering method, since water is given at one time by taking a rough standard of the amount of water for a field which is acceptable for the soil, the stress for crops is suddenly moderated and since in the propagation and growing period for giving the stress, water is not given extremely, the damage to a tree becomes large as its backlash, and it is necessary to use a cultivating method of sacrificing the yield and improving the sugar content. SOLUTION: This automatic watering controller performing a small amount and high frequency watering method by time settings of a parent timer, extension timer and a timer for stopping the watering and a setting of the dryness-limiting value of a soil water content sensor, can give the water stress without reducing a photosynthesizing capacity to realize a high quality without decreasing its yield, and also can perform sprinkling matching with a rapid weather change by a watering judgment of an accurate soil water content sensor having a good response. It is possible to reduce the damage of a tree vigor caused by the stresses such as the water stress, and aim at the decrease of the yield and extension of the tree body. The watering control matching with soil conditions, facility environmental conditions and weather conditions is realized, a stable production with a work saving, high quality, high yield and reproducibility is aimed at and an environment-maintaining type agriculture with a fertilizer reduction and water saving is developed.
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