Contributions of integrated soil fertility management (ISFM) to various sustainable intensification impact domains in Tanzania

Kihara, Job; Manda, Julius; Kimaro, Anthony A.; Swai, Elirehema; Mutungi, Christopher; Kinyua, Michael; Okori, P.; Fischer, Gundula; Kizito, Fred; Bekunda, Mateete

doi:10.1016/j.agsy.2022.103496

Cited by 9 publications

(4 citation statements)

References 72 publications

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“…But many farmers only have a selected set of ISFM components, even though yields (Fig. 3) and economic returns increase with the number of components (Kihara et al, 2022). Employing an increasing number of ISFM components is associated with increased labor costs, but these are often offset by the economic gains.…”

Section: Integrated Soil Fertility Managementmentioning

confidence: 99%

“…The practice of ISFM among farmers varies within and across regions. According to Kihara et al (2022), farmers practiced 1 to 4 ISFM components in sub-humid agroecological zones (AEZs) of Tanzania relative to 0 to 3 components in semi-arid AEZs. There is often high variability in the mix of ISFM components, even within a region, reflecting the complex socioeconomic and biophysical variability that characterizes smallholder farms (Giller et al, 2006;Hörner and Wollni, 2021).…”

Section: Integrated Soil Fertility Managementmentioning

confidence: 99%

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2023

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Section: Integrated Soil Fertility Managementmentioning

confidence: 99%

Section: Integrated Soil Fertility Managementmentioning

confidence: 99%

Untitled

2023

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“…Therefore, many farmers try to increase their production by using more chemical fertilizers. Increasing the use of chemical fertilizers, regardless of the soil fertility level, not only does not improve the soil fertility but also causes an imbalance of nutrients in the soil, plants and creates environmental problems (Amadu et al, 2020;Hörner & Wollni, 2021;Kihara et al, 2022;Yuan et al, 2021;Zhang et al, 2021;Zhou et al, 2022). To prevent these problems and increase the productivity of agricultural lands, successful farmers must adjust the fertility management of their lands in such a way that they do not suffer from the lack or toxicity of nutrients in the lands (O'Connell & Osmond, 2022).…”

Section: Introductionmentioning

confidence: 99%

Comparative assessment of soil fertility across varying elevations

Aqdam

Asadzadeh

Rezapour

et al. 2023

Environ Monit Assess

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Soil fertility and nutrient management are the main factors that directly affect the yield of the product. To evaluate the soil fertility at different elevations (including 1600-2000, 2000-2400, 2400-2800, and >2800 m), 350 surface soil samples (0-30 cm) were collected from the agricultural lands of northwestern Iran.Then, soil properties, including soil texture (%), CaCO 3 (%), pH, EC (dS.m -1 ), organic matter (OM) (%), and soil nutrients (macro and micro) (mg.kg -1 ), were measured. Finally, the interpretation and classi cation of the soil samples were made using the nutritional value index (NIV) based on the Gomez and Common methods. The comparison of the NIV index based on elevation changes showed that the Gomez method tends to classify the soil properties in the optimal class due to its tendency towards the center of the data. But the Common method is more consistent with reality. After classifying the NIV index using the Common method, it was determined that CaCO 3 (%) and soil salinity is not the main problem for soil fertility in different elevation classes. However, in all elevations, high pH, low OM (%) at elevations >2800 m, total nitrogen (TN) (mg.kg -1 ), available phosphorous (AP) (mg.kg -1 ), and micronutrients de ciencies (except Zn at the elevation of 1600-2000 m) are the main limiting factors for soil fertility of agricultural lands. Therefore, to improve the soil fertility in all the elevations of the agricultural lands in the northwest of Iran, there is a need to improve the condition of macro and micronutrients (mg.kg -1 ), especially TN (mg.kg -1 ). Highlights 1. The NIV is a suitable and practical index for evaluating soil fertility.2. At all elevations, TN and pH were the factors of limited soil fertility.3. The EC and CaCO 3 do not limit soil fertility at any elevation.

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“…labour, fertilizers, fungicides, pesticides) needed to achieve higher yields. A stepwise management approach using integrated soil fertility management (ISFM) has been recommended, which targets yield limiting practices step-bystep (CocoaSoils, 2019;Kihara et al, 2022;Vanlauwe et al, , 2015. Our results contribute insights to such an approach for cocoa.…”

Section: Recommendations For Further Researchmentioning

confidence: 73%

Drivers of cocoa yield under current and future climates

Asante

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Cocoa (Theobroma cacao L.) is one of the world's most important agricultural commodity tree crops with the largest share of global production concentrated in West Africa. Current on-farm yields in this region are low and are expected to decrease in response to climate change through decreasing climate suitability. Previous studies identified numerous climate, soil and agronomic management factors limiting cocoa yields on farmer fields, however, the relative importance of these factors in explaining variation in yields which is relevant for prioritizing interventions is largely unknown. Additionally, effects of temperature, rainfall and atmospheric carbon dioxide concentration [CO2] on cocoa tree physiology and productivity are poorly understood. As a consequence, possible implications of climate change for cocoa productivity and adaptationshave not yet been considered. Climate-induced geographic shifts in the West African cocoa belt may have serious implications for farmers, cocoa supply and forests. This thesis therefore aimed to: (1) assess how current climate, soil and management factors affect current cocoa yields; (2) quantify the cocoa yield gap and the factors that can narrow the gap; and (3) assess the impacts of projected changes in climate and the underlying rise in atmospheric concentration [CO2] on future cocoa production. In this thesis, on-farm data on cocoa yield were combined with simulations with a cocoa crop growth model.It was found that under current climate, agronomic management was the dominant determinant of on-farm cocoa yields in Ghana, more so than environmental (climate and soil) conditions whilst climate effects on yields were stronger than soil effects. Nonetheless, the role of environmental conditions on cocoa yield becomes more important with increasing yields, such that the most productive cocoa farms tend to be the ones whose yields are most climate sensitive. Large cocoa yield gaps were found on farms revealing large opportunities to increase yield beyond current levels. Maximum water-limited yield gaps were much larger than yield gaps attainable in high-input and low-input systems. Climate factors were the important drivers of the absolute maximum water-limited and attainable yield gaps in high-input systems, but not in low-input systems. Relative yield gaps (maximum water-limited, attainable in high-and lowinput systems) were reduced by management practices, particularly cocoa tree density and black pod control. This shows that improved agronomic practices offer opportunities to substantially vi increase production of present-day cocoa plantations.Under future climate by mid-century ( 2060), large increases in potential water-limited yields and gains in area suitable for growing cocoa were expected, particularly when assuming full effects of elevated CO2 and under wetter climate-change scenarios. Impacts were expected to follow a (south) east -west gradient with projected yield increases and in area suitable for cocoa being most positive for Cameroon, followed by Nigeria (excep...

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Contributions of integrated soil fertility management (ISFM) to various sustainable intensification impact domains in Tanzania

Cited by 9 publications

References 72 publications

Untitled

Untitled

Comparative assessment of soil fertility across varying elevations

Drivers of cocoa yield under current and future climates

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