After watermelon is set up, it begins to expand rapidly into the squashing period. This time is a crucial period for determining the fruit yield and quality. The management should focus on the following four points:
First, the application of swelling fertilizer
During the expansion period, potassium fertilizer should be re-applied, and appropriate amount of nitrogen fertilizer should be used. Potassium dihydrogen phosphate 225kg/hm2, urea 175kg/hm2, or compound fertilizer 375-525kg/hm2 can be applied. When conditions allow, decomposed oil cake and chicken manure can be properly applied. Pig manure and other organic fertilizers to improve the quality of watermelon, fertilization can be a one-time top dressing or two top dressing (about 5cm in diameter once the fruit diameter, fruit diameter of about 10cm once), can be applied, while the appropriate irrigation.
Second, reasonable irrigation
Swelling watermelons need enough water to grow, but the irrigation must be appropriate and uniform, usually 5-7 days irrigation once to keep the soil dry see see wet is appropriate, this time if the soil is dry and easy to appear wet Crack melon, so be sure to pour water and keep the humidity even.
Third, proper ventilation
During the expansion period, we must master the ventilation time. Generally, ventilation should be started when the shelf temperature is higher than 28°C, and ventilation is completed when the shelf temperature is lower than 26°C. Specifically based on watermelon growth in the shed and the outside weather conditions, watermelon grows more prosperously and prolongs the ventilation time to control growth. When the growth is weak, ventilation time can be appropriately shortened to promote growth. When the outside temperature is high and the lighting is strong, the ventilation time can be appropriately extended to avoid overheating in the shed, low temperature, or when the outside world is rainy, shorten the ventilation time, or use short-time multiple ventilation methods to avoid humidity in the shed. Too large and too cold.
Fourth, prevent disease
The major diseases that damage watermelon during the expansion period are blight, blight and anthracnose. Before the occurrence of the disease, it can be sprayed with Wanjia 500 times solution, Propylene Zinc 600 times solution and Yiwei 750 times solution for prevention, spraying once every 10 days. After the disease occurs, it can be used to take control of 3000 times the enemy stability, good Lectra 3000 times the liquid or difenoconazole 1500 times and so on to prevent bacterial blight and anthrax; with 10% double effect Ling agent 200 times, or 5% Treatment Weiling Ling agent 200 times or 70% Dukesson WP 1000-1500 times, in the plant roots and its vicinity to prevent the wilt.
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