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稻棉轮作是我国南方稻棉兼种地区的固有经验,建国以来,有了较大的发展。在江西的崇仁、临川、新余,湖北的随县、洪湖、浙江的慈溪、余姚,江苏的太仓、沙洲、镇江和上海市郊区的南汇等县,采用较广,并有逐渐扩大的趋势。一、稻棉轮作的优越性水稻连作时间愈长,土壤越板结,棉花连作愈久,土壤越疏松。通过水旱交替种植,可以改良土壤耕性,提高土壤的有效肥力,改善土壤的理化性状,增强土壤的保水、耐旱能力;稻棉根群分布不同,轮作后可以充分利用土壤不同层次的养分;病虫、杂草的发生,由于水旱轮作而失去了依存条件,也受到了很大抑制,因而在轮作周期中,水
Since the founding of the People’s Republic of China, rice-cotton rotation has been an inherent experience in the rice-cotton allo-regions in southern China and has enjoyed a great development. The counties in Chongren, Linchuan and Xinyu in Hubei Province, Suixian in Hubei Province, Cixi in Yuyao in Zhejiang Province, Yuyao in Taicang in Jiangsu Province, Nanchang in Shazhou and Zhenjiang in Jiangsu Province, and Nanhui in the suburbs of Shanghai have been gradually expanding. First, the superiority of rice cotton rotation Rice continuous cropping longer, the more soil knots, the longer the cotton even longer, the looser the soil. By alternate planting of water and drought, soil tillage can be improved, soil fertility improved, soil physical and chemical properties improved and soil water retention and drought tolerance increased. Different distribution of rice root groups could make full use of nutrients at different levels of soil ; The occurrence of pests and weeds, the loss of the dependent conditions due to the rotation of flood and drought, but also greatly inhibited, so in the rotation cycle, water