The invention relates to efficient chemical fertilizers, in particular to an efficient slow-release bulk-blending (BB)
fertilizer and a preparation and application method thereof. The efficient slow-release BB
fertilizer is composed of
urea nitrogen fertilizers, phosphatic fertilizers,
potash fertilizers, secondary
nutrient elements required by plants and trace
nutrient elements required by the plants. Measured according to
urea pure
nitrogen amount of the
urea nitrogen fertilizers,
urea nitrogen fertilizer amount are 40-46.3% of the pure nitrogen amount, phosphatic fertilizer amount is 30-90% of the pure nitrogen amount, the
potash fertilizer amount is 45-100% of the pure nitrogen amount, secondary
nutrient elements comprise
calcium taking up 10-45% of the pure nitrogen amount and
magnesium occupying 5-35% of the pure nitrogen amount, and the trace nutrient elements comprise ferrum occupying 0.1-5% of the pure nitrogen amount,
copper occupying 0.1-3% of the pure nitrogen amount,
manganese occupying 0.5-3% of the pure nitrogen amount,
zinc occupying 0.1-2% of the pure nitrogen amount,
boron occupying 0.05-2% of the pure nitrogen amount and
molybdenum occupying 0.01-2% of the pure nitrogen amount.
Nitrogen fertilizer dosage and proportion of the efficient slow-release BB fertilizer are set fully according to fertilizer requiring characteristics to nitrogen of the plants at different growth periods, continuous supplying of the fertilizer nitrogen is guaranteed, and loss of a
nitrogen fertilizer is controlled remarkably.