サンゴ培地の違いと培養液のアンモニア態窒素およびカルシウム濃度がトマトの生育および収量に及ぼす影響

概要

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In a soil-less culture that utilizes as coral sand as the medium, the high concentration of calcium that dissolves from the coral can reportedly disturb the uptake of potassium, thus reducing the tomato yield. To counteract this effect, the calcium concentration in the nutrient solution can be reduced or the ratio of NH_4-N to Total-N in the nutrient solution can be increased. Calcium carbonate, which is the major compound in coral, is believed to render the phosphorus in the nutrient solution insoluble. We investigated a variety of corals with defferent compositions to establish their effect on tomato cultivation. Based on our results, that non-neated, fine coral sand (φ2mm) appears to produce the greatest growth and yield of tomatos.