河南省持续农业的几个问题

对于持续农业的定义，存在各种各样的说法，但其基本内涵可以概括为：在发展生产的同时，保护资源，改善环境，提高作物质量和产量，以实现农业的持续发展，这里仅对河南省持续发展农业的几个问题作初步探讨。     

三江地区降水与农业

降水与农业关系密切。降水量的多寡及其时空变化特征直接影响着各地的农业生产活动、作物的生长、发育和产量,也在很大程度上决定了各地旱、涝灾害的发生与发展。降水是农业自然资源的重要内容。     

THE SPREAD OF AGRICULTURE IN CHINA

At pressent, China has about 100 million ha of farmland and 1.1 billion inhabitants, of which, about 80% are still engaged in agriculture. In geographical distribution, primitive shifting cultivation was at first mainly scattered in small patches in Eastern Monsoon China, especially concentrated in the middle and lower reaches of the Huanghe (Yellow) River and the Changjiang (Yangtze) River. The ratio of agriculture to industry in production value changed from 7:3 in the early 1950s to 3:7 in the middle 1980s. Agricultural Regionalization is based upon agricultural development as well as physical regionalization in China. Seven first-level agricultural regions might be identified.