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1. Spraying period and number of times.
There are three suitable periods for spraying rare earth on watermelon, namely, the beginning of the vine, the initial flowering stage and the young fruit expansion period. The main functions of the first two periods are to increase the fruit setting rate and increase the yield, and the latter period is applied. It is mainly to increase the sugar content of the fruit and increase the sweetness. Therefore, it is advisable to spray rare earth on watermelon for 2 to 3 times.
2. Spray concentration and dosage.
At the beginning of the extension of the vine, each acre is sprayed with 25 ml of rare earth phytoplankton 25 kg of water or 30 kg of agricultural rare earth nitrate solution with a concentration of 0.03%; in the initial flowering period, 50 ml of water is added per acre with rare earth 40 to 50 kg of diluted or 0.05% rare earth nitrate solution 40 to 50 kg spray; in the early stage of juvenile expansion, 75 ml of rare earth phytoplankton per acre plus 50-60 kg of water or 0.08% of rare earth nitrate Spray the solution. Rare earth moving plant treasure is the third generation of rare earth, which can greatly improve the total utilization rate of rare earth elements, so the comprehensive benefit is better than that of rare earth nitrate.
3. Master the method of application.
Spraying should be carried out on a cloudy day. On sunny days, it should be sprayed when the afternoon sun is not too strong, to avoid glare exposure, and the best effect can be applied before evening. The spray is required to be fine and evenly covered, and the front and back sides of the blade should be sprayed. If it is raining 24 hours after spraying, it should be replenished in time after the rain.
Rare earth sprayed watermelon to increase yield and sweeten
According to the test, the watermelon is sprayed with rare earth, the fruit setting rate is increased by 17% to 30%, the yield is increased by 15% to 30%, the sugar content is increased by 23%, and the ripening period is 3 to 7 days earlier.
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