Assessing and understanding non-responsiveness of maize and soybean to fertilizer applications in African smallholder farms

Roobroeck, Dries; Palm, Cheryl; Nziguheba, Generose; Weil, Ray R.; Vanlauwe, Bernard

doi:10.1016/j.agee.2020.107165

Cited by 29 publications

(25 citation statements)

References 56 publications

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“…As organic matter in soil can reduce P fixation, it contributes to a better availability of P for crops [77], which can explain the positive effect of compost in the mixtures. Unfavorable soil or weather conditions were cited in 68% of the surveyed agricultural fields in sub-Saharan Africa as a reason why mineral fertilizer use did not increase maize yield [78]. This indicates that the multiple interacting factors affecting crop yields are difficult to quantify in general, and that a careful evaluation of fertilizer practices for each cropping site is necessary to ensure returns on fertilizer investments.…”

Section: Higher Maize Yields and Agronomic Nitrogen Use Efficiency In The Combined Fertilizer Treatmentsmentioning

confidence: 99%

Combination of Compost and Mineral Fertilizers as an Option for Enhancing Maize (Zea mays L.) Yields and Mitigating Greenhouse Gas Emissions from a Nitisol in Ethiopia

et al. 2021

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Combined application of organic and mineral fertilizers has been proposed as a measure for sustainable yield intensification and mitigation of greenhouse gas (GHG) emissions. However, fertilizer effects strongly depend on the soil type and still no precise information is available for Nitisols in Ethiopia. The study evaluated effects of different ratios of biowaste compost and mineral fertilizers (consisting of nitrogen (N), phosphorus (P), and sulphur (S)) on maize (Zea mays L. Bako-hybrid) yields in a two-year field trial. Soil samples from each treatment of the field trial were used to estimate emissions of nitrous oxide (N2O), carbon dioxide (CO2), methane (CH4), and microbial activity in a 28-day incubation experiment with two moisture levels (40% and 75% water-filled pore space, WFPS). The application of fertilizers corresponded to a N supply of about 100 kg ha−1, whereby the pure application of mineral fertilizers (100 min) was gradually replaced by compost. Maize yields were increased by 12 to 18% (p < 0.05) in the combined treatments of compost and mineral fertilizers compared to the 100 min treatment. The cumulative emissions of N2O and CO2 but not CH4 were affected by the fertilizer treatments and soil moisture levels (p < 0.05). At 75% WFPS, the N2O emissions in the 100 min treatment was with 16.3 g ha−1 more than twice as high as the treatment with 100% compost (6.4 g ha−1) and also considerably higher than in the 50% compost treatment (9.4 g ha−1). The results suggest that a compost application accounting for 40 to 70% of the N supply in the fertilizer combinations can be suitable to increase maize yields as well as to mitigate GHG emissions from Nitisols in Southwestern Ethiopia.

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Section: Higher Maize Yields and Agronomic Nitrogen Use Efficiency In The Combined Fertilizer Treatmentsmentioning

confidence: 99%

Combination of Compost and Mineral Fertilizers as an Option for Enhancing Maize (Zea mays L.) Yields and Mitigating Greenhouse Gas Emissions from a Nitisol in Ethiopia

et al. 2021

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“…Meta‐analyses of maize fertilizer responses in SSA show that a large proportion of farmers' fields exhibit low yield responses when blanket input recommendations are followed (Kihara et al ). On‐farm trials by Roobroeck et al () find that rates of inorganic fertilizer applications in line with government recommendations did not increase maize yields by more than one ton per hectare for 19% to 30% of farmers' fields, thus frequently leading to financial losses.…”

Section: Soil Degradation and Agricultural Input Use In Western Kenyamentioning

confidence: 99%

“…Second, we assume that maize yields are not affected by farmers that are recommended to not prioritize DAP use. This follows from numerous agronomic and economic studies that demonstrate significant non‐responsiveness of inorganic fertilizer on soils that are overly acidic or have severe nutrient deficiencies (Wopereis et al ; Marenya and Barrett ; Kihara et al ; Burke, Jayne, and Black ; Roobroeck et al ). Third, we are also assuming in our analysis that the soil tests are relatively accurate.…”

Section: Cost–benefit Monte Carlo Simulationmentioning

confidence: 99%

Underground Knowledge: Estimating the Impacts of Soil Information Transfers Through Experimental Auctions†

Murphy¹,

Roobroeck²,

Lee³

et al. 2020

American J Agri Economics

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Soil degradation, a serious environmental problem in many developing countries, often necessitates the use of fertilizers to improve crop yields. However, smallholders usually do not have sufficient information about their soil nutrient levels to make profit‐maximizing decisions about fertilizer usage. We conducted two‐round experimental auctions to determine whether providing information and fertilizer recommendations from inexpensive soil testing kits to farmers in western Kenya affected their behavior and ability to optimize their input choices. We auctioned organic and inorganic agricultural inputs, dividing farmers into information treatments, and analyzed the data using double and triple difference estimations. We find that providing soil information has significant effects on farmers' willingness to pay for inputs. We then use Monte Carlo simulations to show that there is potential for high net benefits to farmers from individualized soil tests. These results suggest that soil testing can be a cost‐effective method to increase food security in the region.

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“…Fosfor merupakan salah satu penyusun ATP dalam tanaman. ATP merupakan sumber energi utama untuk menggerakkan aktivitas metabolisme tanaman termasuk Respons Hasil Kedelai terhadap Pupuk Fosfat penyerapan unsur-unsur makro yang diperlukan bagi tanaman, dengan demikian ketersediaan P juga dapat meningkatkan ketersediaan N (Gardner et al 2010;Roobroeck et al 2021). Tanaman legum, termasuk kedelai membutuhkan P untuk pertumbuhan yang memadai dan fiksasi N dan efektivitasnya dalam perbaikan tanah dapat terhalang oleh defisiensi P (Giller dan Cadisch 1995).…”

Section: Pendahuluanunclassified

Respons Hasil beberapa Varietas Kedelai terhadap Aplikasi Pupuk Fosfat

Subaedah

Netty

Ralle

2021

Agrotechnology Res J

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Soybean is including a major protein source with a relatively higher consumption rate. Similarly, various efforts have been adopted towards boosting production, including selecting high-yield species and soil fertility improvement using fertilizers. This research aims to increase soybean production by employing the appropriate variety and phosphate fertilizers to improve soil fertility. This experiment was conducted in Takalar, South Sulawesi, between April-July 2019. The split-plot design method was applied with three replications. Consequently, the main plot encompasses the treatment of three varieties, termed Argomulyo, Anjasmoro and Gema, while the subplots relate to phosphate fertilization, comprising three levels, including fertilization with a dose of SP-36 at 50, 100 and 150 kg.ha-1. The results showed that the modifications in variety and phosphorus fertilization significantly influenced soybean production, as Argomulyo obtained the maximum rate of 2.77 t.ha-1, followed by Anjasmoro at 2.45 t.ha-1. Furthermore, phosphate fertilization with a dose of SP-36 at 100-150 kg.ha-1 demonstrated the optimal soybean production as indicated by the maximum productive nodes and pods. Therefore, no interaction was observed between the various species and phosphate fertilization.

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Assessing and understanding non-responsiveness of maize and soybean to fertilizer applications in African smallholder farms

Cited by 29 publications

References 56 publications

Combination of Compost and Mineral Fertilizers as an Option for Enhancing Maize (Zea mays L.) Yields and Mitigating Greenhouse Gas Emissions from a Nitisol in Ethiopia

Combination of Compost and Mineral Fertilizers as an Option for Enhancing Maize (Zea mays L.) Yields and Mitigating Greenhouse Gas Emissions from a Nitisol in Ethiopia

Underground Knowledge: Estimating the Impacts of Soil Information Transfers Through Experimental Auctions†

Respons Hasil beberapa Varietas Kedelai terhadap Aplikasi Pupuk Fosfat

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