For every 1000 kg of watermelon produced, 1.94 kg of nitrogen, 0.39 kg of phosphorus pentoxide, and 1.98 kg of potassium oxide should be absorbed.
The basal fertilizer should be applied in the hilly and hilly areas where the soil is poor. The clay must be reused. Sandy soil basal fertilizer should be concentrated. Apply 3000-5000 kg of organic fertilizer per acre in two applications, 1/3 paving, and the rest are applied in planting loquat or melon ditch, and apply superphosphate 20-40 kg, cake fertilizer 70-100 kg, urea 40-50 kg, 50-80 kg of plant ash or 3-4 kg of potassium sulfate. Watermelon is a chlorine-free crop and do not use potassium chloride. Spring shed basal fertilizer, per acre applied to compost organic fertilizer 1000 kg, cake fertilizer 90-120 kg, compound fertilizer 30 kg, urea 10 kg, or 150-200 kg of cake fertilizer, 15-20 kg of ammonium sulfate, potassium sulfate 10-12 kg. Centered on the colonization behavior center.
In the spring greenhouse, from the time of planting to vine spreading, it is generally not top-dressing. If there is insufficient base fertilizer, it can be poured 2-3 times per acre with 150 to 300 kg of thin decomposed manure, combined with loose soil, if covered with plastic film or continuous rain. Days, can dig holes in the roots, spread 1 kg of urea or ammonium sulfate per acre. After the plants have 5 true leaves, they begin to spread, according to climatic conditions and plant growth, in the distance of about 50 cm from the root ditch fertilization or digging holes, 40-60 kg of cake fertilizer per acre, or cooked chicken, duck dung 400-800 kg. If composted soil fertilizer is used, 10-15 kg of compound fertilizer should be added. Most plants set fruit, young fruit when the size of the egg re-application of fertilizer, about 40 cm from the root side of the ditch or digging hole cast cake fertilizer 40-60 kg, or ammonium sulfate 10-15 kg, potassium sulfate 5 kg. Should be flexible according to growth, can be divided into time.
Exposed cultivation of top dressing When the watermelon begins to spread, apply 75-100 kg of cake fertilizer per mu, or 500-750 kg of dried manure, add 3-5 kg ​​of urea at the same time, 15-20 cm from the root ditch or hole, fertilizer application depth To 10-15 cm is appropriate, early maturing varieties or weak varieties, fertilizer should be appropriate in advance. After the young melons are settled, 20-25 kg of fast-acting compound fertilizer or 10-15 kg of urea and 10 kg of potassium sulfate are applied per acre. After the number of fruits is determined, 10 kg of N and P compound fertilizer and 10 kg of K fertilizer can be applied, which will help improve the quality of watermelon. After the second melon sat, topdressing NPK fertilizer 15 kg.
Foliage fertilizers commonly used fertilizer 0.2% -0.3% of potassium dihydrogen phosphate, 0.4% -0.5% of potassium sulfate, 0.4% -0.5% of superphosphate, 0.3% -0.5% of urea or ammonium sulfate solution.
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