Sökning: "rice agriculture"
Visar resultat 1 - 5 av 24 avhandlingar innehållade orden rice agriculture.
1. Sustainable agriculture : From global challenges to local land management
Sammanfattning : Despite the success of agriculture management practices in increasing the availability of food needed to meet the requirements of the expanding global population, there are increasing demands placed on the resources on which the sector depends. Opportunities for the development of agricultural systems are constrained by increasing competition, from other sectors, for shared resources. LÄS MER
2. In the wake of the Green Revolution : Environmental and socioeconomic consequences of intensive rice agriculture - The Problems of weeds in Muda, Malaysia
Sammanfattning : The agricultural intensification strategies represented by the Green Revolution have since the mid-1960s had a very positive impact on food-grain production in Asia. Presently, however, a post-Green Revolution phase of declining growth in output and productivity is experienced in many of the areas where intensification took place. LÄS MER
3. Traditional lowland rice agriculture in Sri Lanka : Nitrogen cycling and options for biofertilizers
Sammanfattning : The aim of this thesis has been: to study the dynamics of soil organic-matter, with regard to nitrogen in a traditional lowland-rice agricultural system; to consider options for and nitrogen cycling of biofertilizers, especially the green-manure legume Sesbania sesban; to discuss fertilizer sources and management constraints as parts of a sustainable agricultural development; and to discnss the methodological problems of controlled experiments vs. investigations in farmer's fields. LÄS MER
4. The Lie of the Land: Gender, Farm Work, and Land in a Rural Vietnamese Village
Sammanfattning : This anthropological study investigates ways in which perceptions of gender intersect with the everyday dealings of land and farming practices in a village in the northern part of Vietnam. The point of departure for this study is a desire to take a closer look at how processes of gendering actually take place and become meaningful on a day-to-day basis. LÄS MER
5. Drainage intensity in paddy rice fields : nitrogen flows, salinity, rice yield and greenhouse gas emissions
Sammanfattning : Managing drainage intensity is important in controlling soil moisture and nutrient losses and improving crop yields. This thesis evaluated the effects of drainage intensity on nitrogen losses, salinity and rice grain yield in three cropping seasons, and on gaseous emissions of methane (CH4) and nitrous oxide (N2O) from rice flowering to ripening in one season, on a marshland in semiarid region of Rwanda. LÄS MER