Land use change dynamics and impact

Download Land use change dynamics and impact

Post on 28-Jul-2015

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1. Despite growing demands for food production because of an increasing population, in South Asia there are vast areas of land left fallow. When there is insufficient irrigation for year-round cropping, lands are left fallow after the cultivation of rainfed rice, and even after irrigated rice. After the rice harvest there is often adequate stored soil moisture, along with any subsequent rainfall, to support a following crop, at least one of short duration. Legume yields are often poor and, as a result large areas with the potential for cultivating a post-rice crop are left fallow. The main reasons for this are the suite of agronomic difficulties in establishing and growing a crop after rice, where a hard plough-pan is deliberately created to retain water for rice culture. However, there are now proven technologies available (e.g., short- duration legume varieties, seed treatments, mechanization) that would make it feasible and profitable to increase the area of land to grow post-rice crops. Successful demonstration and extension of these technologies would open the way for greater income generation by the economically disadvantaged rice cultivators of South Asia, who presently have few options for enterprise diversification. Mapping post-rice fallows and rabi fallows using remote sensing imagery will help identify areas for demonstration and dissemination of this technology which are potential areas. Cropping pattern changesLand use change dynamics 1. Land use changes are a regular phenomenon due to agro-ecological, socio-economic and policy decisions. Some changes are so significant that they make a large difference in the agro-economic scenario of the place, specifically when water availability affects critically the decision making of the small holder farmers. Chickpea expansion in some districts of Andhra Pradesh is a good example of such change. Chickpea growing areas expanded in these districts gradually replacing another crop since there was a good economic gain in growing it. Less farm operations and mechanization also promoted this crop. 2. Remotely sensed imagery can be effectively used to monitor cropland changes and identify the niches for present changes in cropping pattern and its impact. Land use / land cover Groundnut / sorghum / fallows Maize / mixed crops Cotton-chilli Orchards / mixed crops Rice-mixed crops Other LULC Chickpea 2000-01 2012-13 RS-GIS unit, RDS Tracking of crop expansion / yield estimations and impact Andhra Pradesh

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