Chemical characteristics of phosphorus in some representative benchmark soils of Zambia

Yerokun, Olusegun A.

doi:10.1016/j.geoderma.2008.07.007

Cited by 14 publications

(8 citation statements)

References 31 publications

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“…A target yield of 8 tons/ha equals a N fertilizer demand of 240 kg N/ ha (assuming a N content of 1.5% (Yang et al 2012) and a NUE of 50%), resulting in a N demand exceeding the recommended N input of 112 kg N/ha. When we aim for a yield of 8 tons/ha, and assume a slightly higher potential NUE of 60% by proper fertilizer management including appropriate additions of phosphorus and zinc that often limit crop yields in Zambia (Yerokun 2008;Yerokun and Chirwa 2014), an N input of 200 kg N/ha would be recommended. Conclusively, increasing the actual yields will require a holistic farm system approach considering various aspects of agronomic management including land preparation, pest and disease control, and weed management.…”

Section: Potential To Reduce Climate Change Impacts By Managementmentioning

confidence: 99%

Climate change impacts on rainfed maize yields in Zambia under conventional and optimized crop management

et al. 2021

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Maize production in Zambia is characterized by significant yield gaps attributed to nutrient management and climate change threatens to widen these gaps unless agronomic management is optimized. Insights in the impacts of climate change on maize yields and the potential to mitigate negative impacts by crop management are currently lacking for Zambia. Using five Global Circulation models and the WOFOST crop model, we assessed climate change impacts on maize yields at a 0.5° × 0.5° spatial resolution for RCP 4.5 and RCP 8.5 scenarios. Impacts were assessed for the near future (2035-2066) and far future (2065-2096) in comparison with a reference period (1971-2001). The surface temperature and warm days (above 30 °C) are projected to increase strongly in the southern and western regions. Precipitation is expected to decline, except in the northern regions, whereas the number of wet days declines everywhere, shortening the growing season. The risk of crop failure in western and southern regions increases due to dry spells and heat stress, while crops in the northern regions will be threatened by flooding or waterlogging due to heavy precipitation. The simulated decline in the water-limited and water- and nutrient-limited maize yields varied from 15 to 20% in the near future and from 20 to 40% in the far future, mainly due to the expected temperature increases. Optimizing management by adjusting planting dates and maize variety selection can counteract these impacts by 6-29%. The existing gaps between water-limited and nutrient-limited maize yields are substantially larger than the expected yield decline due to climate change. Improved nutrient management is therefore crucial to boost maize production in Zambia.

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Section: Potential To Reduce Climate Change Impacts By Managementmentioning

confidence: 99%

Climate change impacts on rainfed maize yields in Zambia under conventional and optimized crop management

et al. 2021

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show abstract

“…Since we assumed an NUE of 50%, it is evident that N limits actual crop yield. When we aim for a yield of 8 tons/ha, and assume a slightly higher potential NUE of 60%, by proper management of all other nutrients including appropriate additions of phosphorus (P) and zinc (Zn) that often limit crop yields in Zambia (Yerokun, 2008;Yerokun and Chirwa, 2014), an N input of 200 kg N/ha would be recommended.…”

Section: Potential To Reduce Climate Change Impacts By Managementmentioning

confidence: 99%

Climate change impacts on rainfed maize yields in Zambia under conventional and optimized crop management

Siatwiinda

Supit

Hove

et al. 2021

Preprint

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Maize production in Zambia is characterized by significant yield gaps attributed to nutrient management and climate change threatens to widen these gaps unless agronomic management is optimized. Insights in the impacts of climate change on maize yields and the potential to mitigate negative impacts by crop management is currently lacking for Zambia. Using five Global Circulation models and the WOFOST crop model, we assessed expected climate change and the impacts on maize yields at a 0.5° × 0.5° spatial resolution for RCP 4.5 and RCP 8.5 scenarios. Impacts were assessed for two future periods (i.e. near future: 2035–2066 and far future: 2065–2096) in comparison with a reference period (1971–2001). The average surface temperature and summer days (above 30°C) are projected to increase strongly in the southern and western regions. Precipitation is expected to decline, except in the northern regions while the number of wet days decline everywhere, indicating a shortening growing season. The risk of crop failure in western and southern regions increases due to dry spells and heat stress while crops in the northern regions will be threatened by flooding or waterlogging due to heavy precipitation. The simulated decline in the water limited and water- and nutrient- limited maize yields varied from ca 15–20% in the near future and from ca 20–40% in the far future, mainly due to the expected temperature increases. Optimizing management by adjusting planting dates and maize varieties can counteract these impacts by 6–29%. Quantitatively, the existing gaps between water limited yields and nutrient limited maize yields are substantially larger than the expected yield decline due to climate change. Improved nutrient management is therefore crucial to avoid crop yield decline and might even increase crop yields in Zambia.

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“…In impacted pure ferralitic soils, the exchangeable P content was not detected indicating that even though these soils were enriched with phosphorus, it was not exchangeable. This was due to phosphate adsorption on Fe and Al hydroxides and oxyhydroxides (Daroub et al, 2003;Fontes and Weed, 1996;Yerokun, 2008). Phosphate ions can't be drained to the groundwater in pure ferralitic soils but they can easily be in mixed calcareous soils.…”

Section: Nitrogen and Phosphorus Contamination Of Soilsmentioning

confidence: 99%

Effects of long term raw pig slurry inputs on nutrient and metal contamination of tropical volcanogenic soils, Uvéa Island (South Pacific)

Gunkel-Grillon

Roth

Laporte-Magoni

et al. 2015

Science of The Total Environment

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In small Polynesian islands, family pig breeding is usually conducted without recovery of pig slurry. Raw pig slurry is spread onto the soil without any treatment. So far, most of the studies were carried out in temperate climate and for industrial digested pig slurry applications on agricultural lands. In the present case study, conducted in Uvéa Island, the aim is to determine if long term application of raw pig slurry on tropical soils, naturally rich in heavy metals has a significant influence on elements concentrations and mobility. Two types of tropical soils and two pig breeding systems, pig enclosure on small concrete pens or pig enclosure in large land pens, were investigated. Here we demonstrate that raw pig slurry inputs on soils can lead to an increase of total nitrogen and phosphorus content with high Contamination Factors. The Pollution Load Index values (1.3; 5.3; 2.5; 2.3) were indicative of multi-heavy metals pollution (Fe, Mn, Al, Cu, Zn, Cr and Ni) in mixed calcareous soils of the coastal area and they are exchangeable while they are immobilized or less mobile in inland pure ferralitic soils. For mixed calcareous soils of the coastal area, family pig breeding represents a drainage risk of soluble species (phosphorus, inorganic nitrogen, Fe, Mn, Al, Cu, Zn, Cr and Ni). For inland ferralitic soils, family pig breeding is more compatible with a sustainable management of the environment in Uvéa Island and by extension in volcanic tropical islands with respect to the investigated chemical elements.

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Chemical characteristics of phosphorus in some representative benchmark soils of Zambia

Cited by 14 publications

References 31 publications

Climate change impacts on rainfed maize yields in Zambia under conventional and optimized crop management

Climate change impacts on rainfed maize yields in Zambia under conventional and optimized crop management

Climate change impacts on rainfed maize yields in Zambia under conventional and optimized crop management

Effects of long term raw pig slurry inputs on nutrient and metal contamination of tropical volcanogenic soils, Uvéa Island (South Pacific)

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