1.西瓜品质下降的原因1.1品种选择不当产品品质与种子的遗传特性密切相关,生产上忽略当地气候的特殊性及地理位置,盲目引种,造成其田间适应性差,品质变劣。1.2重茬病害加剧西瓜枯萎病病菌在土壤中可存活10年以上,瓜田应与非瓜类作物轮作4～5年以上,但种植户因承包土地的局限性, 1. The reasons for the decline of watermelon quality 1.1 Improper selection of varieties The quality of the products is closely related to the genetic characteristics of the seeds. Ignoring the particularity and geographical location of the local climates in production, they are introduced blindly, resulting in poor field adaptability and poor quality. 1.2 Stubble disease exacerbation Watermelon Fusarium wilt bacteria in the soil can survive more than 10 years, melon fields and non-melon crop rotation for 4 to 5 years or more, but the farmers due to the limitations of the contracted land,