黑龙江省每年种植百万亩西瓜。西瓜一般是从五月上中旬播种,到八月中下旬收瓜结束,收获后的西瓜地空闲着不用。同时,黑龙江省每年又种植百万亩面积的晒茬大白菜。晒茬白菜,就是在七月中旬前,这菜地先空闲着不用,到七月中旬后开始播种,一直到十月中旬霜冻前收获结束。因此,根据 Heilongjiang Province, planting millions of acres of watermelon each year. Watermelon is generally sown from mid-May to late August harvest melon end, after harvest, the watermelon free useless. At the same time, Heilongjiang Province has planted more than one million mu of dried cabbage per year. Stubble cabbage, that is, before mid-July, this dish first idle, to start sowing in mid-July, until the end of the harvest before the frost in mid-October. So, according to