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Nutritional studies of cassava have shown that in high-P acid laterite soils, there was no response to P application during four years of consecutive cropping. In low-P soil, even though cassava initially responded to 100 kg P2O5/ha, the response gradually declined. The optimum economic dose of P...


Mohankumar, C.R.Potty, V.P.Ravindran, C.S.Kabeerathumma, S.Sudharmai Devi, C.R.[Progress in agronomy research in India]Progress in agronomy research in India

In recent years the National Root and Tuber Crops Program of Vietnam, with the cooperation and assistance of the Centro International de Agricultura Tropical (CI AT), has drawn up a plan for strengthening the research and development capacity, with the objective of improving cassava production in...


Nguyen Huu HyPham, Van BienNguyen The DangThai Phien[Recent progress in cassava agronomy research in Vietnam]Recent progress in cassava agronomy research in Vietnam

Five soil types on which cassava is being planted were investigated. Almost all these soils are degraded in terms of soil properties, especially with respect to soil fertility. Cassava is traditionally planted without fertilizer application and soil conservation measures, resulting in a negative ...


Thai PhienNguyen Cong Vinh[Nutrient management for cassava-based cropping systems in Northern Vietnam]Nutrient management for cassava-based cropping systems in Northern Vietnam

En Costa Rica, el promedio del área sembrada de frijol en el período de 1986-96 fue de 55,765 ha., con una producción de 30,653 TM, para una productividad de 558.5 kg/ha y un consumo per cápita de 11.43 kg. Las dos principales zonas productoras son la Brunca (9,25" longitud O. 83,00" latitud N.) ...


Araya Villalobos, Rodolfo[Sistema nacional de investigación de frijol en Costa Rica: Logros, dificultades y futuro]Sistema nacional de investigación de frijol en Costa Rica: Logros, dificultades y futuro

Humphreys, L.R.Ivory, D.A.Chee, Wong ChoiTopark-Ngarm, A.[Experiencia regional con Centrosema:Asia tropical y Región del Pacífico]Experiencia regional con Centrosema:Asia tropical y Región del Pacífico

Se detallan ensayos sobre tolerancia a la toxicidad del Al y a la baja disponibilidad de P; efectos morfologicos y fisiologicos de la toxicidad del Al; requerimientos nutricionales de especies forrajeras de gramineas y leguminosas; sintomas foliares visuales de problemas de origen mineral y sobre...


International Center for Tropical Agriculture[Soil Fertility and plant nutrition]Soil Fertility and plant nutrition

El objetivo de la seccion de Microbiologia de suelos es maximizar los beneficios de la fijacion biologica del N en forrajes adaptados a los suelos acidos e infertiles de America Latina tropical, con prioridad en la simbiosis leguminosa/Rhizobium. La estrategia de la investigacion consiste en: 1) ...


International Center for Tropical Agriculture[Soil microbiology]Soil microbiology

Trees can influence both the supply and availability of nutrients in the soil. Trees increase the supply of nutrients within the rooting zone of crops through (1) input of N by biological N2 fixation, (2) retrieval of nutrients from below the rooting zone of crops and (3) reduction in nutrient lo...


Buresh, R.J.Tian, G.[Soil improvement by trees in sub-Saharan Africa]Soil improvement by trees in sub-Saharan Africa

CIAT has worked in Ethiopia for 30 years, in collaboration with the Ethiopian Institute of Agricultural Research (EIAR) and regional agricultural research centers. Initially focused on bean variety development − getting improved, better beans to communities, improving their nutrition and incomes ...


International Center for Tropical Agriculture[CIAT in Ethiopia: Science for Impact]CIAT in Ethiopia: Science for Impact

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