上海郊区种植棉花,大多是实行两熟栽培的,在耕作上存在以下两个问题:(1)小麦、大麦、蚕豆等秋播作物,大部分等不到棉花拔杆就要下种,因此只有套种在棉花行内;同样春季在豆麦行内再套种棉花,大部棉田不能冬耕也不能春耕。(2)如果等小熟作物收获以后,特别是小麦收获以后再播种棉花,产量很 The cultivation of cotton in the suburbs of Shanghai is mostly carried out in two-cropping. There are two problems in farming: (1) Autumn seeding crops such as wheat, barley and broad bean are most likely to be planted less than the cotton rod, so only Intercropping in the cotton line; the same spring in the bean and cotton interplanting cotton, most of the cotton fields can not be winter plowing can not. (2) If other small crops are harvested, especially after sowing cotton after harvesting