循環式養液栽培培地におけるリン酸一水素カルシウム沈でんの生成

概要

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The composition of 431 nutrient solutions for hydroponic cultivation of tomato, strawberry, Japanese hornwort and welsh onion were investigated from the standpoint of forming of calcium phosphate precipitation. The results were summarized as follows. 1) There were 23 nutrient solutions which had precipitation. These nutrient solutions had a higher value of electric conductivity, concentration of P, Ca, Mg, Fe and B than the other nutrient solutions which had not precipitation. 2) The composition of the precipitations in nutrient solutions were identified as brushite(CaHPO_4・2H_2O, dicalcium phosphate dihydrate) by using X-ray diffraction. 3) From the results if calculations of p(HPO_4^<2->) and p(Ca^<2+>) in nutrient solutions for hydropinic cultivation which were used by farmers, 16% of 431 nutrient solutions were supersaturated with equilibrium condition of brushite, but none of them were undersaturation with gypsum.
1993-06-05