Key points of watermelon soil testing formula fertilization technology

1 , watermelon fertilizer characteristics

       For every 100 kilograms of watermelon produced, about 0.19 kg of nitrogen , 0.092 kg of phosphorus , and 0.136 kg of potassium are needed. In general, a sufficient amount of nitrogen fertilizer is the basis for high yield of watermelon. Phosphorus fertilizer facilitate adequate root, can promote the plant growth and development, promote differentiation, so that early flowering, early fruit set, early maturity, and plant body potassium catalyst is more enzymes, enhances photosynthesis, protein Synthesis, increase in sugar , improve the quality of melons, etc.

2 , the determination of the amount of fertilizer

       Production rate of application of nitrogen, phosphorus and potassium is generally N: P2O5: K2O = 1: 0.3-0.5: 0.8-1, to determine the amount of fertilizer, can explore reasonable amount field trials, you can also find out the test unit After yielding fertilizer, soil fertility, fertilizer utilization and Other relevant fertilization parameters, the soil nutrient content is determined before birth, and the fertilization amount is calculated by the nutrient balance method fertilizer application formula:

        A summary analysis of the watermelon fertilizer test conducted in recent years in our district has proposed a watermelon field of 2500-3000 kg per mu . The fertilizer application rate is generally N 20-23 kg, P2O5 6-9 kg, K2O 16-20 kg.

3 , fertilization method

(1), apply enough base fertilizer

        Usually organic fertilizer per acre plots basal watermelon 1000 to 1500 kg, FCMP 40 to 50 kg, 5 kg of urea, potassium chloride, 8-10 kg. It is advisable to apply the ditch, and it can also be applied to the melon and then turned into the soil .

(2), skillful application of seedling fertilizer

        At the seedling stage of watermelon, sufficient quick-acting fertilizer is needed in the soil to ensure the normal growth of the seedlings. In general, some of the fertilizers have been applied to the base fertilizer, as long as there is no symptoms of deficiency in the seedling stage, it is not possible to topdress. If the fertilizer applied in the base fertilizer is less, or the plot is not equipped with chemical fertilizer, the amount of seedling fertilizer should be chased in order to promote the normal growth and development of the seedling. Fertilization time the seedlings grow to 2 - 3 true leaves when appropriate, a catalyst, or before pouring water seedlings per acre topdressing 4-5 kg of urea. Seedling stage topdressing should not be too much, too close to the roots, so as not to cause dead roots.

(3), the foot chasing the vine

         After the watermelon melon has been stretched, it should be promoted before the vine water is poured. Since the vine is covered with the glutinous rice noodles soon after the vine is stretched (some places are used to cover the glutinous rice when the vine is stretched), it is not suitable. cultivator fertilizer, so most of the fertilizer to be applied at this time. Usually mu topdressing NPK 20--25 kg, 20-25 kg of urea, potassium sulfate 10-12 kg. It is advisable to apply vines to the vines, but the ditch should not be too close to the melons to avoid root damage and cover the soil after fertilization.

(4), depending on the application of melon fertilizer

        Before and after the flowering of watermelon, it is a key period for sitting melon. In order to ensure that the watermelon plant can sit normally, it is generally not necessary to top dress. However, when the young melon grows to the size of the duck egg, the watermelon enters the peak of the absorption. In this period, if the lack of fertilizer not only affects the expansion of the melon , but also causes the later de-fertilization, the plant premature aging, which not only reduces the yield of watermelon, but also affects the quality of the melon. So to Zuogua discretion fertilizer applied, generally available high concentrations of fertilizer 5--10 kilograms watered shower facilities.

(5), appropriate spraying of foliar fertilizer in the later stage

        After the watermelon is expanded, it enters the late maturity stage, and the ability of the root system to absorb fertilizer has been obviously weakened. To make up for the lack of roots and to ensure the normal maturity and quality of the watermelon, the foliar spray can be applied. For example, 0.2-0.3 % urea solution or 0.2 % urea + potassium dihydrogen phosphate mixture can be sprayed .