The Effect of Azolla on Nitrogen Use Efficiency in Rice-wheat Rotations of Nepal

The Effect of Azolla on Nitrogen Use Efficiency in Rice-wheat Rotations of Nepal
Author: Junoo Kamal Tuladhar
Publisher: Cuvillier Verlag
Total Pages: 130
Release: 2004
Genre: Science
ISBN: 3898739740

The low productivity of the rice-wheat cropping system in Nepal is associated with a low efficiency of applied mineral N in rice. The aquatic fern Azolla was used to reduce N losses via ammonia volatilization from the flooded lowland rice in farmers' field conditions in Nepal. The Azolla cover changed the floodwater chemistry, thus reducing ammonia volatilization losses. The use of Azolla in combination with Urea increased rice yields by 15% and reduced urea-N losses from 17-38% to 2-8%. A combined use of Azolla and urea is a viable option to enhance the productivity of rice-wheat systems in Nepal.

Effects of Pesticides on Soil Fauna

Effects of Pesticides on Soil Fauna
Author: Marcos Garcia
Publisher: Cuvillier Verlag
Total Pages: 297
Release: 2004
Genre:
ISBN: 386537106X

Duas importantes questões foram levantadas neste estudo: (1) O efeito e destino dos pesticidas em solos de regiões temperadas podem ser diferentes em solos tropicais? (2) Os dados produzidos nas regiões temperadas podem ser usados para a avaliação de risco ambiental nos trópicos?

Ecophysiological Diversity of Wild Arabica Coffee Populations in Ethiopia

Ecophysiological Diversity of Wild Arabica Coffee Populations in Ethiopia
Author: Taye Kufa Obso
Publisher: Cuvillier Verlag
Total Pages: 331
Release: 2006
Genre:
ISBN: 386727990X

Coffea arabica, one of the economically most important crops worldwide, occurs naturally in the undergrowth of montane rainforests of Ethiopia. The study provides the first detailed ecophysiological investigations of wild coffee populations. It demonstrates the inter- and intra-regional variability in phenotypic and hydrological characteristics of wild coffee. The results reveal very different strategies of wild coffee seedlings for coping with drought stress. The ecophysiological diversity shows the importance of Ethiopian wild coffee populations as gene pools for future breeding programs, and underlines the need for an in-situ conservation strategy. The study includes recommendations for coffee forest management and the use of wild arabica coffee in Ethiopia.

The Spatial Distribution of Soil Salinity

The Spatial Distribution of Soil Salinity
Author: Akmal Akramkhanov
Publisher: Cuvillier Verlag
Total Pages: 139
Release: 2005
Genre:
ISBN: 3865376541

Soils of irrigated lands in the Aral Sea Basin are often plagued by high salinity,hampering profitable agriculture on these soils. In this context, the present study has three specific objectives: to identify techniques that enable a rapid estimation of soil salinity, to characterize its spatial distribution and to estimate its spatial distribution based on readily obtainable environmental parametersusing a Neural Network Model Approach. Topsoil salinity was highly variable atshort distances and terrain attributes were the most influential factors. The use of relationships between environmental attributes and soil salinity for upscaling spatial distribution of soil salinity from farm to district level proved to be satisfactory. A possible application is the development of salinity prediction toolsfor farm-level decision making.