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Wheat nutrient response functions for the east Africa highlands

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Title Wheat nutrient response functions for the east Africa highlands
 
Creator Cyamweshi, A.R.
Nabahungu, L.N.
Senkoro, C.J.
Kibunja, C.N.
Mukuralinda, Athanase
Kaizzi, K.C.
Mvuyekure, S.M.
Kayumba, J.
Ndung'u-Magiroi, Keziah Wairimu
Koech, M.N.
Wortmann, Charles S.
 
Subject highlands
fertilizers
application
triticum aestivum
wheat
nutrient
 
Description Wheat (Triticum æstivum L.) is an important East Africa highland crop but yields are low. Information is scarce for optimization of fertilizer use. Research was conducted to determine yield response functions for N, P and K, and to diagnose Mg–S–Zn–B deficiencies. The average grain yield increase in Rwanda due to N application was 1.5 Mg ha−1 with a mean economically optimal rate (EOR) of 68 kg ha−1 N. In Kenya and Tanzania, yield was increased by 29% with EOR N for two SY but unaffected by N rate for four other SY which on average had 50% of the soil organic C (SOC) as the N-responsive SY. Yield was increased, on average, with application of P and K by 0.47 and 0.23 Mg ha−1, respectively, at EOR in Rwanda but effects were inconsistent for other SY where soil test K was higher than in Rwanda. Application of Mg–S–Zn–B resulted in 0.46 Mg ha−1 more yield in Rwanda but did not affect yield at other SY where the average soil test values for these nutrients was 35% higher than in Rwanda. If the financially constrained farmer opts to apply the affordable fertilizer to twice as much land at 50% EOR compared with 100% EOR, the mean yield increase is reduced by 27% but production and PCR are increased by 43 and 72%, respectively. Nutrient effects were relatively consistent and positive in Rwanda, but less and less inconsistent elsewhere with generally less SOC, more K–Mg–S–Zn–B availability, and often lower yields.
 
Date 2018-05
2018-08-15T14:31:23Z
2018-08-15T14:31:23Z
 
Type Journal Article
 
Identifier Cyamweshi, A.R., Nabahungu, L.N., Senkoro, C.J., Kibunja, C., Mukuralinda, A., Kaizzi, K.C., ... & Wortmann, C.S. (2018). Wheat nutrient response functions for the east Africa highlands. Nutrient Cycling in Agroecosystems, 111(1), 21-32.
1385-1314
https://hdl.handle.net/10568/96560
https://doi.org/10.1007/s10705-018-9912-z
NATURAL RESOURCE MANAGEMENT
 
Language en
 
Rights Copyrighted; all rights reserved
Limited Access
 
Format 21-32
 
Publisher Springer Science and Business Media LLC
 
Source Nutrient Cycling in Agroecosystems