Abstract
Crop production in Sub-Saharan Africa is primarily limited by soil fertility decline. In view of this, the fertilizer value of locally available organic materials (OMs) was assessed for their nutrient release to crop growth. Crop residues and farmyard manure (FYM) were evaluated along with mineral fertilizers to grow a test crop maize variety – Gibe 2. The maize allometric parameters, nutrient ratios (NRs), nutrient recovery (NRy) and mineral fertilizer equivalency (MFE) were used to assess the mineral fertilizer value (MFV) of OMs. MFE of OMs was estimated as the available mineral N and P out of the fraction of total nitrogen and phosphorus applied relative to mineral fertilizers supply. The results revealed that maize allometry, NRy and MFE were significantly influenced by fertilizer sources. OM amendment resulted in poor maize allometry and low NRy. Interestingly, MFE of OM amended ranged from −201% with chickpea (CHP) residue to 63% with FYM. The results demonstrate that CHP has the poorest quality, while FYM is a good-quality OM as a fertilizer source.
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Claims 7
Claim · model-written summary
Fertilizer sources significantly influenced maize allometry, nutrient recovery and mineral fertilizer equivalency.
Zea maysNot reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results revealed that maize allometry, NRy and MFE were significantly influenced by fertilizer sources.”
Claim · model-written summary
Organic material amendment resulted in poor maize allometry.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“OM amendment resulted in poor maize allometry and low NRy.”
t0“maize”
Claim · model-written summary
Organic material amendment resulted in low nutrient recovery.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“OM amendment resulted in poor maize allometry and low NRy.”
t0“maize”
Claim · model-written summary
Chickpea residue had a mineral fertilizer equivalency of −201%.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“MFE of OM amended ranged from −201% with chickpea (CHP) residue to 63% with FYM.”
t0“maize”
Claim · model-written summary
Farmyard manure had a mineral fertilizer equivalency of 63%.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“MFE of OM amended ranged from −201% with chickpea (CHP) residue to 63% with FYM.”
t0“maize”
Claim · model-written summary
The authors rated chickpea residue the poorest organic fertilizer source.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results demonstrate that CHP has the poorest quality, while FYM is a good-quality OM as a fertilizer source.”
t0“maize”
Claim · model-written summary
The authors rated farmyard manure a good organic fertilizer source.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results demonstrate that CHP has the poorest quality, while FYM is a good-quality OM as a fertilizer source.”
t0“maize”
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