The invention relates to a maize
fulvic acid polyelement composite liquid base
fertilizer taking concentrated
biogas slurry as a base solution, which is prepared from the following raw materials in portion by weight: 195 to 200 portions of
ammonium polyphosphate, 110 to 115 portions of
urea, 280 to 285 portions of
potassium chloride, 5 to 6 portions of
borax, 10 to 11 portions of heptahydrate
zinc sulphate, 10 to 12 portions of suspending agent, 345 to 321 portions of the concentrated
biogas slurry and 45 to 50 portions of
fulvic acid. The liquid base
fertilizer contains 352 to 368 g / L of macroelement, 53 to 57 g / L of the
fulvic acid, and 11 to 21 g / L of water-insoluble matters; and the pH value of the
fertilizer subjected to
dilution by 250 times is 6.2 to 6.5. The production of the fertilizer comprises the following steps: comprehensive analysis of soil agricultural-
chemistry characteristics, maize fertilization experiment, calculation of fertilizer proportion, selection of raw materials, material preparation, and mixing and preparation; and water is used for diluting the fertilizer by 200 times, and hole application is performed on the diluted fertilizer when hole
sowing is performed on maize seeds at the same time, or the fertilizer is applied at a dosage of 65
kilogram / mu when water is irrigated to field. The fertilizer has no secondary
pollution, and has reasonable and even application; and the invention provides a base fertilizer containing the macroelement, microelement and fulvic acid active substances to promote the growth and production increase of maize.