秋西瓜对以小麦为主的黄淮及华北地区的粮食生产影响不大,且种植秋西瓜为小麦提供了肥沃的早茬地,易获得小麦高产。 秋西瓜一般于7月份播种,光、温等条件好,可满足西瓜生育要求。但是,此时正值长江中下游及其以南地区高温干旱季节.如果高温干旱时间持续较长,易诱发病毒病,而且夜间温度高,昼夜温差小,养分积累少,植株生长纤弱,并易遭受台风袭击,产量很不稳定;北方地区此时则正处于雨季,对西瓜出苗和前期生长十分不利;生长中后期的气温变化由高渐 Autumn watermelon on wheat-based Huanghuai and North China’s grain production has little effect, and planting autumn melon for wheat to provide a fertile stubble, easy to get high-yield wheat. Autumn melon generally sown in July, light, temperature and other conditions are good, to meet the watermelon requirements. However, it is at this time of high temperature and drought season in the middle and lower reaches of the Yangtze River and in the south of the Yangtze River.If the prolonged high temperature and drought continues for a long time, it is easy to induce virus disease, and the nighttime temperature is high, the temperature difference between day and night is small, the nutrient accumulation is small, Suffered a typhoon attack, the output is very unstable; the northern region at this time is in the rainy season, watermelon emergence and early growth is very unfavorable; mid-late growth temperature changes from high to gradually