The invention relates to a mixing compound
fertilizer special for paddy capable of slowly releasing
urea formaldehyde. The mixing compound
fertilizer comprises the following components in parts by weight: 100-160 parts of
urea formaldehyde fertilizer, 180-250 parts of common
urea, 280-430 parts of
calcium superphosphate, 200-320 parts of
potassium sulfate fertilizer, 50-80 parts of
magnesium sulfate fertilizer, 2-3 parts of
zinc sulfate fertilizer and 2-3 parts of
borax fertilizer. In the mixing compound fertilizer, the
urea formaldehyde nitrogen is 30%-40% of the
total nitrogen application rate; once the fertilizer is applied as a base fertilizer, no topdressing is required; the mixing compound fertilizer can meet the requirements of the growth season and fertilizer requirement of the paddy, can obviously reduce the phosphorous content and increase the
potassium content and can meet the requirements for the three
nutrient elements, namely,
nitrogen,
phosphorus and
potassium, all the medium elements, namely,
calcium,
magnesium and
sulfur, and the microelements, namely,
zinc and
boron which are required by the growth and development of the medium / high-
fertility field paddy crops; the mixing compound fertilizer has the characteristics of long
nitrogen fertilizer efficiency period, high use ratio, capabilities of boosting the paddy growth, increasing the paddy yield and saving the
nitrogen fertilizer dosage; compared with the present enveloping controlled-release fertilizer, the mixing compound fertilizer has the
advantage that no
plastic film residue is remained in the soil.