Progress in research on site-specific nutrient management for smallholder farmers in sub-Saharan Africa

Chivenge, Pauline; Zingore, Shamie; Ezui, K.S.; Njoroge, Samuel; Bunquin, Michelle Anne; Dobermann, A.; Saito, Kazuki

doi:10.1016/j.fcr.2022.108503

Cited by 47 publications

(46 citation statements)

References 80 publications

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“…During recent decades, an approach termed site-specific nutrient management (SSNM) was designed aiming to increase the nutrient-use efficiency of major nutrients, such as N, phosphorus (P), and potassium (K), and to generate field-specific fertilizer recommendations ( Chivenge et al, 2022 ). The SSNM is a dynamic, generally plant-based, soil and crop growth season-specific nutrient management approach which intends to synchronize nutrient provision and demand based on the differences in plant requirements, indigenous nutrient provision, and nutrient recovery from applied fertilizers and other resources ( Figure 6 ).…”

Section: Toward Better N Managementmentioning

confidence: 99%

“…For N fertilizer inputs, SSNM determines the optimum amount of fertilizer that is required to be applied, and further calculates the balanced supply throughout the crop growing season to synchronize the peak demands for N by the plant, depending on the needs of crop varietal types, soil texture and structure, and variations in the environmental conditions ( Peng et al, 2010 ). Further approaches, including leaf color charts, can also be utilized for additional in-season modifications of the projected N amendments, therefore empowering further tweaking against the actual crop growth conditions ( Chivenge et al, 2022 ). SSNM was initially conceived in Asia for smallholder rice producers, where field occupations tend to be small with large spatial variabilities regarding the soil nutrient statuses and management.…”

Section: Toward Better N Managementmentioning

confidence: 99%

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Recent trends in nitrogen cycle and eco-efficient nitrogen management strategies in aerobic rice system

Farooq

Wang

Uzair³

et al. 2022

Front. Plant Sci.

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Rice (Oryza sativa L.) is considered as a staple food for more than half of the global population, and sustaining productivity under a scarcity of resources is challenging to meet the future food demands of the inflating global population. The aerobic rice system can be considered as a transformational replacement for traditional rice, but the widespread adaptation of this innovative approach has been challenged due to higher losses of nitrogen (N) and reduced N-use efficiency (NUE). For normal growth and developmental processes in crop plants, N is required in higher amounts. N is a mineral nutrient and an important constituent of amino acids, nucleic acids, and many photosynthetic metabolites, and hence is essential for normal plant growth and metabolism. Excessive application of N fertilizers improves aerobic rice growth and yield, but compromises economic and environmental sustainability. Irregular and uncontrolled use of N fertilizers have elevated several environmental issues linked to higher N losses in the form of nitrous oxide (N2O), ammonia (NH3), and nitrate (NO3–), thereby threatening environmental sustainability due to higher warming potential, ozone depletion capacities, and abilities to eutrophicate the water resources. Hence, enhancing NUE in aerobic rice has become an urgent need for the development of a sustainable production system. This article was designed to investigate the major challenge of low NUE and evaluate recent advances in pathways of the N cycle under the aerobic rice system, and thereby suggest the agronomic management approaches to improve NUE. The major objective of this review is about optimizing the application of N inputs while sustaining rice productivity and ensuring environmental safety. This review elaborates that different soil conditions significantly shift the N dynamics via changes in major pathways of the N cycle and comprehensively reviews the facts why N losses are high under the aerobic rice system, which factors hinder in attaining high NUE, and how it can become an eco-efficient production system through agronomic managements. Moreover, it explores the interactive mechanisms of how proper management of N cycle pathways can be accomplished via optimized N fertilizer amendments. Meanwhile, this study suggests several agricultural and agronomic approaches, such as site-specific N management, integrated nutrient management (INM), and incorporation of N fertilizers with enhanced use efficiency that may interactively improve the NUE and thereby plant N uptake in the aerobic rice system. Additionally, resource conservation practices, such as plant residue management, green manuring, improved genetic breeding, and precision farming, are essential to enhance NUE. Deep insights into the recent advances in the pathways of the N cycle under the aerobic rice system necessarily suggest the incorporation of the suggested agronomic adjustments to reduce N losses and enhance NUE while sustaining rice productivity and environmental safety. Future research on N dynamics is encouraged under the aerobic rice system focusing on the interactive evaluation of shifts among activities and diversity in microbial communities, NUE, and plant demands while applying N management measures, which is necessary for its widespread adaptation in face of the projected climate change and scarcity of resources.

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Section: Toward Better N Managementmentioning

confidence: 99%

Section: Toward Better N Managementmentioning

confidence: 99%

Recent trends in nitrogen cycle and eco-efficient nitrogen management strategies in aerobic rice system

Farooq

Wang

Uzair³

et al. 2022

Front. Plant Sci.

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“…Meanwhile, Saito et al (2021) defined agronomic gain in yield as the difference in yield between improved agronomic practices such as alternate nutrient, water, and weed managements, and/or their combinations and the control, which can be typical farmers’ practices, recommended practices, or practices having no input (e.g., no applied fertilizer). Several review papers have summarized impact of improved agronomic practices on agronomic gain in yield in SSA ( Chivenge et al, 2021 , Chivenge et al, 2022 , Ibrahim et al, 2021 , Saito et al, 2021 ). For instance, integrated crop management practices for irrigated rice systems showed yield gain from 1.6 to 3.1 t/ha ( Saito et al, 2021 ), while improved nutrient management has resulted in agronomic gain in yield from 0.4 to 2.9 t/ha ( Ibrahim et al, 2021 ).…”

Section: Introductionmentioning

confidence: 99%

Assessing genetic and agronomic gains in rice yield in sub-Saharan Africa: A meta-analysis

Ibrahim¹,

Saito

2022

Field Crops Research

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“…In combination with other agronomic practices, the use of mineral fertilisers is considered indispensable for closing yield gaps (Chivenge et al, 2022;Van Ittersum et al, 2016;. The average fertiliser use in SSA is about 20 kg ha -1 , which is very low compared to the global average of 137 kg ha -1 , although large differences among and within countries in SSA can be found (Sheahan and Barrett, 2017;Vanlauwe and Dobermann, 2020;World Bank, 2022).…”

Section: Introductionmentioning

confidence: 99%

“…The average fertiliser use in SSA is about 20 kg ha -1 , which is very low compared to the global average of 137 kg ha -1 , although large differences among and within countries in SSA can be found (Sheahan and Barrett, 2017;Vanlauwe and Dobermann, 2020;World Bank, 2022). The limited use of fertilisers has several causes, such as high costs and limited access (Chivenge et al, 2022). Furthermore, a strong driver for the use of fertilisers is their profitability, which depends on the crop response to fertilisation .…”

Section: Introductionmentioning

confidence: 99%

Models for predicting nutrient availability in soils from sub-Saharan Africa

Breure

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Progress in research on site-specific nutrient management for smallholder farmers in sub-Saharan Africa

Cited by 47 publications

References 80 publications

Recent trends in nitrogen cycle and eco-efficient nitrogen management strategies in aerobic rice system

Recent trends in nitrogen cycle and eco-efficient nitrogen management strategies in aerobic rice system

Assessing genetic and agronomic gains in rice yield in sub-Saharan Africa: A meta-analysis

Models for predicting nutrient availability in soils from sub-Saharan Africa

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