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1. Are Kenyan farmers under-utilizing fertilizer? Implications for input intensification strategies and research

Author:
Black, Roy,   et al.   ; Sheahan, Megan; Jayne, T.S.;     Show all 3 Authors
Source:
Food policy 2013 v.41 pp. 39-52
ISSN:
0306-9192
Subject:
corn; farmers; fertilizer rates; mineral fertilizers; nitrogen; profitability; research planning; surveys; Kenya
Abstract:
... It is widely perceived that African farmers are under-utilizing inorganic fertilizer. However, very little long-term evidence from farmers’ fields, accounting for variations in agro-ecological conditions, has been assembled to back this claim or determine the conditions under which it is true. Using five waves of nationwide household survey data from Kenya covering 13years, we estimate the relativ ...
DOI:
10.1016/j.foodpol.2013.04.008

2. Fertilizer Phosphorus Recovery After Seventeen Years of Dryland Cropping

Author:
Black, A. L.,   et al.   ; Halvorson, A. D.;     Show all 2 Author
Source:
Soil Science Society of America journal 1985 v.49 no.4 pp. 933-937
ISSN:
0361-5995
Subject:
Carthamus tinctorius; Hordeum vulgare; Triticum aestivum; arid lands; barley; crop year; cropping systems; fertilizer rates; grain crops; nitrogen; nitrogen fertilizers; phosphorus; phosphorus fertilizers; straw; superphosphate; wheat; Great Plains region
Abstract:
... Information on long-term fertilizer P recovery by grain crops from a single broadcast application in the northern Great Plains is limited. Uptake of P by grain and straw was measured in 10 or 11 crops (1967 or 1968 to 1983) grown on a Williams loam (fine-loamy, Typic Argiborolls) in a split-plot, randomized complete block experiment. Fertilizer N, as main plots, was applied each crop year, except ...
DOI:
10.2136/sssaj1985.03615995004900040029x

3. Long-term Dryland Crop Responses to Residual Phosphorus Fertilizer

Author:
Black, A. L.,   et al.   ; Halvorson, A. D.;     Show all 2 Author
Source:
Soil Science Society of America journal 1985 v.49 no.4 pp. 928-933
ISSN:
0361-5995
Subject:
arid lands; crop year; crops; fertilizer rates; grain yield; long term effects; nitrogen; phosphorus fertilizers; soil; tillage
Abstract:
... Little information is available on the long-term effects of a single P fertilizer application on grain yields of crops grown on dryland soils deficient in plant-available P. Therefore, duplicate plots were established in 1967 and 1968 on a Williams loam (fine-loamy mixed, Typic Argiborolls) with a NaHCO₃−extractable P of 6 mg P/kg soil. A split-plot, randomized complete block design was used with ...
DOI:
10.2136/sssaj1985.03615995004900040028x