Application of boron fertilizer on boron-deficient soil has a good promoting effect on the growth and development of watermelon. According to the test, the application of boron fertilizer watermelon, flowering 3 days in advance, the rate of increase of 7.4%, an increase of 11.7%, 0.7 degrees sweetening. The application of boron fertilizer is as follows:
Basal fertilizer uses 0.5-1 kg of borax per acre, or 3.5-7 kg of boron-magnesium fertilizer, or 15-20 kg of boron sludge, mixed with appropriate amounts of nitrogen and phosphorous fertilizer, and spreads into the soil when the soil is set. Grooves are generally not used. Point application, so as to avoid excessive local boron concentration on the watermelon has a toxic effect. Part of the soil boron concentration is too high and has a toxic effect on watermelon.
The top dressing is foliar sprayed with 0.1% to 0.2% borax solution. In addition, boron fertilizer can also be formulated into a sugar-enhancing liquid on watermelon. The method is: using borax 30 grams, calcium chloride 5 grams, sucrose 1 kilogram, water 50 kilograms, or use borax 200 grams, 0.7 grams of calcium chloride, sucrose 2.4 kilograms, water 50 kilograms, fully dissolved after the watermelon begins to expand Foliar spraying, spray 50 ~ 100 kg per acre, generally can increase production by 10% to 20%.
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