西瓜汁多味甜,消暑解渴,是人们喜受的夏令瓜果之一。上海郊区每年都有较大面积的栽培,七十年代全市平均每年种植西瓜5.6万亩,1982年以来,扩种到10万多亩。1965—1983年,全市西瓜平均亩产30.4担,但产量不稳,年际变化大(图1)。如全市西瓜平均亩产,1978年最高为48担,1983年最低仅6.7担。两年的平均亩产竞相差41.3担之多。西瓜产量不稳,其原因是多方面的,但从农业气象分析可以看出,气候影响是一个重要因素。 西瓜原产非洲,喜温好光,最怕多雨。上海西 Watermelon juice and more sweet, refreshing thirst quencher, is one of the most popular summer melon fruit. The suburbs of Shanghai have large-scale cultivation every year. In the 1970s, the city averaged 5.6 million mu of watermelons every year. Since 1982, it has expanded to more than 100,000 mu. In 1965-1983, the average watermelon in the city was 30.4 mu per mu, but the yield was unstable and the interannual variation was large (Figure 1). For example, the average watermelon output per mu in the whole city was 48 in 1978 and the lowest was only 6.7 in 1983. The average yield over two years is 41.3% less than that of 41.3%. Watermelon yield instability, for many reasons, but from the analysis of agricultural meteorology we can see that climate impact is an important factor. Origin of watermelon in Africa, hi warm, fear of rain. Shanghai West