Abstract
Secondary and micronutrients are important in enhancing crop productivity; yet, they are hardly studied in sub-Sahara Africa. In this region, the main focus has been on macronutrients but there is emerging though scattered evidence of crop productivity limitations by the secondary and micronutrients. Elsewhere, widespread deficiencies of these nutrients are associated with stagnation of yields. Here, we undertake a meta-analysis using 40 articles reporting crop response to secondary and micronutrients to (1) determine the productivity increase of crops and nutrient use efficiency associated with these nutrients, and (2) provide synthesis of responses to secondary nutrients and micronutrients in sub-Sahara Africa. This study used 757 yield data rows (530 from publications and 227 from Africa Soil Information Service) from field trials carried out in SSA between 1969 and 2013 in 14 countries. Data from publications constituted response to S (49.4%), Zn (23.0%), S and micronutrient combinations (11.5%), and <10% each for Cu, Mo, Fe, and B. Data from Africa Soil Information Service were all for S and micronutrient combinations. Of the two sources, most yield data are for maize (73.6%), followed by sorghum (6.7%) and wheat (6.1%) while rice, cowpea, faba bean, tef, and soybean each accounted for less than 5%. The major points are the following: (1) application of S and micronutrients increased maize yield by 0.84 t ha−1 (i.e., 25%) over macronutrient only treatment and achieved agronomic efficiencies (kilograms of grain increase per kilogram of micronutrient added) between 38 and 432 and (2) response ratios were >1 for S and all micronutrients, i.e., the probability of response ratio exceeding 1 was 0.77 for S and 0.83 for Zn, 0.95 for Cu, and 0.92 for Fe, and indicates positive crop response for a majority of farmers. We conclude that S and micronutrients are holding back crop productivity especially on soils where response to macronutrients is low and that more research is needed to unravel conditions under which application of S and micronutrients may pose financial risks.
Highlights
We conclude that S and micronutrients are holding back crop productivity especially on soils where response to macronutrients is low and that more research is needed to unravel conditions under which application of S and micronutrients may pose financial risks
The aim of this study was to determine the productivity increase in cereal and grain legume crops and nutrient use efficiency associated with application of secondary and micronutrients through a meta-analysis of available published data, and to provide synthesis of responses to secondary nutrients and micronutrients in SSA
There is high variability in crop response to S and micronutrients, the high proportions of cases with increased yield underscore the need for these nutrients
Summary
There are strong indications from some studies of the effects of deficiencies in secondary nutrients and micronutrients limiting crop productivity in SSA, especially under continuous cropping without nutrient replenishment (Vanlauwe et al 2015; Van Asten et al 2004; Fig. 1). Low productive spots related to zinc (Zn) deficiency have been observed in rice (Van Asten et al 2004) following continuous cultivation without micronutrient application, but could relate to interactions with other factors such as soil alkalinity and high plant available soil P. Deficiencies of secondary nutrients and micronutrients have been observed in other parts of the world such as Campo Cerrado soils of Brazil, IIanos of Colombia, and calcareous soils of Pakistan, India, and the Philippines (Lopes 1980; Ryan et al 2013). In comparison to other regions of the world, relatively little research has been done on secondary and micronutrient deficiencies in soils and the corresponding crop responses in SSA
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