所谓“化瓜”，即在雌花开放后，幼瓜自然萎缩脱落的现象。在正常气候条件下，约有47％的雌花不能座瓜，环境恶劣时可达95％，严重影响西瓜早期产量，推迟上市季节。导致化瓜的原因，主要是植株徒长，营养生长和生殖生长失调；种植过密，蔓叶郁蔽，影响光合作用，花期遇阴雨和 The so-called “melon”, that is, after the female flowers open, the phenomenon of natural shrinkage shedding. Under normal climatic conditions, about 47% of female flowers can not seat melon, up to 95% when the environment is bad, seriously affecting the early yield of watermelon, postponed the season of listing. Lead melon causes, mainly plant growth, vegetative growth and reproductive growth disorders; planting is too dense, covered with leaves, affecting photosynthesis, blooming rainy and