Comparison of fertilizer effects of potassium silicate and potassium chloride on apples [Malus pumila] growing on Kuroboku soil.
1994
Kumashiro K.
Effects of fertilizers containing three levels of potassium silicate (PS) and potassium chloride (PC) on the tree growth and the yield and quality of lfruits of the "Fuji"/M26 apple g rowing on the Kuroboku soil were studied over seven years from 1987 to 1993. Results obtained are summarized as follows: 1) The shoot growth and the increase of trunk girth were the best in the trees to which the low level of Pc was applied. On the other hand, growth of both shoot and trunk was worse in the trees given no potassium and in those fertilized with the high level of either PS or PC than in others. 2) Check of the root growth conducted in 1990 on the half of trees planted revealed that PS-fertilizer promoted the growth better than the PC. 3) Flower buds were more abundant in the trees supplied with PS-fertilizer than in those grown without potassium and also than in those given low and medium levels of PC. On the yield of fruits, the trees fertilized with PS was better than those with PC until 1991, but the best yield was obtained in the trees supplied with low and medium levels of PC in 1993. 4) Fruits of the trees given no potassium were small in size and low in acid and sugar contents of their juice. Fruits of the trees fertilized with PS were slightly darker in skin color and slightly higher in sugar content compared with those of trees given the PC fertilizer. Application of the high level of PC increased clearly the acid content of fruit juice.
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