Abstract
Effects of the single basal application of controlled availability fertilizers (CAFs) on growth, yield and fruit quality of tomato plants were studied in comparison with conventional rapidly availability fertilizer. 1) CAFs plots were divided into two types corresponding to even releasing plot and middle and latter stage releasing plot which were designed by blending CDU compound fertilizer and three sigmoid types of polyolefin coated fertilizers (POCFs) with the different releasing type. 2) There was no difference in width or length of leaves or diameter of stems of tomato plants between the single basal application of CAFs plots and conventional plot. 3) Total fruit yield of tomatoes in the middle and latter stage releasing plot was superior to that in the conventional fertilizer plot. Yield of Grade A (good shape, 100g<) for the middle and latter stage releasing plot was superior to those in the conventional plot and in the even releasing plot. 4) There was no difference in contents of soluble solids (Brix %) or ascorbic acid of tomato fruits. 5) From the results mentioned above, the labor saving cultivation of tomatores by a single basal application using several kinds of sigmoid type CAFs without any decrease in either yield or quality of tomato fruits is highly feasible.
