Characteristics of fertilizer requirement of watermelon

The whole growth period of watermelon plant is short, and the fruit is very large, so the plant has a large demand for fertilizer in its lifetime, and the proportion of demand for nitrogen, phosphorus and potassium is also different, with potassium being the most, phosphorus the least and nitrogen in the middle. According to the calculation of 1000 watermelons per mu, it can absorb 14.5kg of nitrogen, 4.8kg of diphosphorus dioxide and 20.4kg of potassium oxide. The absorption ratio of nitrogen, phosphorus and potassium is 3: 1: 4.