Sökning: "yield variability"
Visar resultat 16 - 20 av 61 avhandlingar innehållade orden yield variability.
16. On the dynamic ST-segment during acute myocardial infarction
Sammanfattning : Acute myocardial infarction is the single most common cause of death for both men and women in Sweden. Great efforts have over the years successfully been made to improve immediate treatment and care, and thereby prognosis. However, inadequacies in use of new knowledge and technology have been reported in this field. LÄS MER
17. 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
18. Understanding crop and farm management : links to farm characteristics, productivity, biodiversity, marketing channels and perceptions of climate change
Sammanfattning : Agriculture faces challenges in meeting rising demand for food, feed, fibre and fuel while coping with pressure from globalisation, limited natural resources and climate change. Farmers will choose management practices based on their goals and available resources and these practices will influence farm performance. LÄS MER
19. Long-term development, modeling and management of nutrient loading to inland and coastal waters
Sammanfattning : Environmental and water system protection and restoration require accurate knowledge and quantification of waterborne pollutant transport, retention-release and transformation processes taking place in the subsurface, river, lake and sea water systems, and at the interfaces between these systems. This thesis investigates the importance of spatial model resolution for such quantification and the possible long-term nutrient load development under different human perturbations and nutrient source management scenarios in the Swedish Norrström drainage basin, based on simulations with the GIS-based dynamic nutrient transport-attenuation model POLFLOW. LÄS MER
20. Smallholder farm management and priorities : balancing productivity, livelihood, climate adaptation and ecosystem services
Sammanfattning : Smallholders in sub-Saharan Africa are highly vulnerable to climate change, but also have good potential for improving production. This thesis examined how Kenyan smallholders manage their farming systems to adapt to rainfall variability and improve productivity, while also maintaining sustainable delivery of multiple ecosystem services. LÄS MER
