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The yield gap has arisen again as a focus for agricultural research to ensure food security and economic growth for farmers around the world. To examine this renewed interest, we carried out a review of key literature in the field of yield gap analysis to identify important gaps in research and a...


Snyder, Katherine A.Miththapala, SriyanieSommer, RolfBraslow, Juliet[The yield gap: closing the gap by widening the approach]The yield gap: closing the gap by widening the approach

Information on the inter- and intra-specific variability in the acquisition and utilization of phosphorus (P) by promiscuous soybean genotypes under low-P conditions can be helpful in the short-term management of soil P availability. Thirteen promiscuous soybean genotypes were evaluated in a low-...


Nwoke, O.C.Okogun, JASanginga, NteranyaDiels, J.Abaidoo, R.C.Osonubi, O.[Phosphate rock utilization by soybean genotypes on a low-P savanna soil and the status of soil P fractions after a subsequent maize crop]Phosphate rock utilization by soybean genotypes on a low-P savanna soil and the status of soil P fractions after a subsequent maize crop

A crop growth simulation model was used to study the impact of climate change for the period 2010,2050 on water productivity of rainfed rice. In general, the results suggest that water productivity of rainfed rice may increase significantly in the upper basin in Laos and Thailand and may decrease...


Mainuddin, M.Kirby, M.Hoanh, Chu Thai[Water productivity responses and adaptation to climate change in the Lower Mekong Basin.]Water productivity responses and adaptation to climate change in the Lower Mekong Basin.

Animal manure is one of the principal sources of nutrients for soil fertility maintenance and crop production in semi-arid west Africa. Farm-level decisions concerning the use of manure are governed by socioeconomic and institutional factors, as much as they are by agronomic ecological concerns. ...


Williams, Timothy O.[Factors influencing manure application by farmers in semi-arid West Africa]Factors influencing manure application by farmers in semi-arid West Africa

Eleven Sesbania sesban and three S. goetzei accessions were evaluated for dry matter (DM) yield in response to phosphorus (P) application and fodder quality on an acidic Nitosol at Soddo, in the Ethiopian highlands. The soil at this site is known to be P deficient and to have high ability to fix ...


Berhe, KahsayTothill, J.C.Mohamed-Saleem, M.A.[Response of different sesbania accessions to phosphorus application and fodder quality of S. sesban under acid soil conditions]Response of different sesbania accessions to phosphorus application and fodder quality of S. sesban under acid soil conditions

Nitrogen is the nutrient with greatest influence on yield and cost production of rice; it is then necesary to look for its most efficient use. Three field experiment were carried out to determine the agornomic efficiency of four urea forms (prilled, forestry grade, supergranules and sulfur-coated...


Arregocés, Oscar[Evaluación de la eficiencia agronómica de cuatro formas de urea en el cultivo del arroz]Evaluación de la eficiencia agronómica de cuatro formas de urea en el cultivo del arroz

The effect of shade and fertilizer application on nutrient uptake and dry matter (DM) partitioning in cocoyam was evaluated by growing the plant under different levels of shade and fertilizer application at Forest and Horticultural Crops Research Centre, Kade, within a period of 9 months. The sha...


Asante, M.O.O.Ahiakpa, J.K.Amoatey, C.Adjei-Nsiah, Samuel[Effect of shade and level of fertilizer application on nutrient uptake and dry matter partitioning in cocoyam (Xanthosoma sagittifolium L.)]Effect of shade and level of fertilizer application on nutrient uptake and dry matter partitioning in cocoyam (Xanthosoma sagittifolium L.)
Autor: Ashby, J.A.

Although farmer participation is an important concept in farming systems programs, farmer participation is typically restricted to the management of on-farm trials and little information exists on alternative approaches. This paper evaluates three approaches to farmer participation differentiated...


Ashby, J.A.[Methodology for the participation of small farmers in the design of on-farm trials]Methodology for the participation of small farmers in the design of on-farm trials

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