期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
美国中南部土壤磷钾丰缺指标体系及其施肥推荐
1
作者 马宏卫 孔国顺 张海林 《土壤》 CAS CSCD 北大核心 2011年第5期854-856,共3页
对美国中南部有代表性的7个州(俄克拉荷马、阿肯色、德克萨斯、路易斯安那、堪萨斯、爱荷华、北卡罗来纳)的最新的土壤磷钾丰缺指标体系和主要作物的磷钾施肥推荐量进行了研究与整理,旨在对我国的测土配方施肥工作有所启迪。
关键词 美国中南部 土壤磷钾丰缺指标 施肥推荐
下载PDF
A Quantitative Approach to Analyse Rural Population and Development in Some African and Southern-Central American Countries over 10 Years
2
作者 Nicola Galluzzo 《Journal of Agricultural Science and Technology(B)》 2013年第3期189-198,共10页
In developing countries, the emigration from rural territories to urban areas has brought about some negative impacts strictly associated to a lack of services a drop of ecological sustainability and environment prote... In developing countries, the emigration from rural territories to urban areas has brought about some negative impacts strictly associated to a lack of services a drop of ecological sustainability and environment protection with the consequence to worsen the marginalization of these territories. In the world, more than 50% of poverty is located in rural areas and the most incidence of it is in Sub-Saharan African countries; in Latin American nations, instead, the most percentage of poverty is located in urban areas. The aim of this research was to estimate, by a multiple regression model, in 46 countries of Africa and in 23 nations of Souther-Central America, which socio-economic variables were able to play a fundamental role on the rural population and on the development of rural areas in 2000 and 2010 using some statistical data published in the FAO Statistic book. In analysed African countries there has been an increase of people living in the rural space and a growth by 21% of agricultural Gross Domestic Product (GDP). In Southern and Central American nations, there has been a meaningful emigration from rural territories due to an expansion of commercial flows and per capita income in rich areas, thus people have decided to move from the rural territories to the urban territories, worsening the poverty and living conditions in the countryside. 展开更多
关键词 Rural areas developing countries emigration social capital multiple regression model agricultural gross domesticproduct.
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部