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Displaying 596 - 600 of 1605Collective management on communal grazing lands: Its impact on vegetation attributes and soil erosion in the upper Blue Nile basin, northwestern Ethiopia
Collective action, on communal grazing land, has evolved in the highlands of northwestern Ethiopia to mitigate the problems of feed shortage and land degradation due to overgrazing. The exercise is liked by farmers for improving the availability of natural pasture during the long dry season when other feed sources get depleted. However, large portions of the communal grazing lands are still managed under free grazing throughout the year.
Trade-offs between land use intensity and avian biodiversity in the dry Chaco of Argentina: A tale of two gradients
Studies to assess the relationship between agriculture production and biodiversity conservation usually focus on one gradient ranging from a natural reference land cover type (typically forest) to an intensive productive land use. However, many semi-arid ecoregions such as the dry Chaco are characterized by a mosaic of different land covers, including natural grasslands and woody vegetation with different degrees of transformation, frequently aimed at meat production.
Forecasting crop yield using remotely sensed vegetation indices and crop phenology metrics
We used data from NASA's Moderate Resolution Imaging Spectroradiometer (MODIS) in association with county-level data from the United States Department of Agriculture (USDA) to develop empirical models predicting maize and soybean yield in the Central United States. As part of our analysis we also tested the ability of MODIS to capture inter-annual variability in yields. Our results show that the MODIS two-band Enhanced Vegetation Index (EVI2) provides a better basis for predicting maize yields relative to the widely used Normalized Difference Vegetation Index (NDVI).
Vegetable production in the Red River Delta of Vietnam. I. Opportunities and constraints
An overview is given of the natural, socio-economic, agronomical and marketing conditions for vegetable production in the Red River Delta (RRD) of Vietnam. The seasonal variation in temperature in the RRD is the main determinant for the production season of vegetables. Heavy rainfall in the hot season increases production risks, as it may physically damage crops. Frequent rainfall in this period may enhance disease incidence. Landholdings are small and individual plots are the smallest of Indochina. Vegetables typically are produced in flooded rice based systems.
On markets and government: property rights to promote sustainability with market forces
There are many different images of the livestock industry and many persons are unhappy with the outcome of the market process. Instead of explaining why the market leads to the current outcomes, it is wise to be prepared that politics will rearrange the property rights in order to produce different outcomes of the market mechanism. In this essay, I show that there are market processes that contribute to a more sustainable way of farming, and that these processes can be reinforced. There are also unsustainable public policies that can be liberalized.