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Phosphorus micro-dosing as an entry point to sustainable intensification of rice systems in sub-Saharan Africa

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Title Phosphorus micro-dosing as an entry point to sustainable intensification of rice systems in sub-Saharan Africa
 
Creator Vandamme, E.
Ahouanton, K.
Mwakasege, L.
Mujuni, S.
Mujawamariya, Gaudiose
Kamanda, J.
Senthilkumar, Kalimuthu
Saito, Kazuki
 
Subject dibbling
emergence
food security
subsaharan africa
rice
 
Description Phosphorus (P) deficiency is a major biophysical limitation to rice grain yields in sub-Saharan Africa, and low-cost P management strategies are needed by smallholder farmers to reverse soil fertility decline. On-station field and pot experiments were combined with on-farm testing to evaluate the effect of P micro-dose placement in dry-seeded, dibbled rice on emergence, early vigour and grain yield. Placing a micro-dose of 3–6 kg P ha−1 in the planting hole consistently increased early vigour and grain yield of both a P-efficient and less P-efficient rice genotype. An agronomic efficiency of P fertilizer (AEP) of 356–817 kg grains kg−1 P was achieved with a micro-dose of 3 kg P ha−1. A negative effect on emergence by placing a P micro-dose in the planting hole observed in one experiment was compensated by a higher grain weight per hill. In other experiments, no negative effect on plant emergence under both well-watered and water-stressed conditions and with different P sources was observed even when fertilizers were mixed with seeds. A micro-dose of 20–30 kg of DAP ha−1 placed in the planting hole resulted in an average net increase in profit of $91 to $136 ha−1 and benefit:cost ratio of 3–12 in on-farm experiments. Farmers' appreciation of the technology was positive but lack of credit, availability of appropriate fertilizers in local agrodealers and increased labour requirements were identified as potential constraints for adoption. P micro-dose placement in the planting hole can be used as an entry point towards sustainable intensification in dry-seeded, dibbled rice systems in SSA, provided it is accompanied by institutional support and mechanization options to increase its adoption potential.
 
Date 2018-06
2019-07-02T14:57:02Z
2019-07-02T14:57:02Z
 
Type Journal Article
 
Identifier Vandamme, E., Ahouanton, K., Mwakasege, L., Mujuni, S., Mujawamariya, G., Kamanda, J., Senthilkumar, K., and Saito, K. 2018. Phosphorus micro-dosing as an entry point to sustainable intensification of rice systems in sub-Saharan Africa. Field Crops Research 222:39-49.
0378-4290
https://hdl.handle.net/10568/102056
https://doi.org/10.1016/j.fcr.2018.02.016
 
Language en
 
Rights Copyrighted; all rights reserved
Limited Access
 
Format p. 39-49
 
Publisher Elsevier
 
Source Field Crops Research