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Fertilizer nitrogen recovery efficiency in the sub-humid highlands of Central Kenya

By: Kihanda, F.M | Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico).
Contributor(s): Edmeades, G.O.|Banziger, M.|Mickelson, H.R.|Peña-Valdivia, C.B [eds.] | O'Neill, M.K [coaut.] | Palmer, A.F.E [coaut.] | Wood, M [coaut.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: Mexico, DF (Mexico) CIMMYT : 1997ISBN: 968-6923-93-4.Subject(s): Highlands | Kenya | Nitrogen content | Plant production | Soil types | CIMMYT | Zea mays AGROVOC | Soil fertility AGROVOC | Nitrogen fertilizers AGROVOCDDC classification: 633.153 Summary: Nitrogen is one of the major soil nutrients limiting maize production in the sub-humid highlands of Central Kenya. Afield experiment was designed to determine fertilizer N recovery by maize, measured by the 15N isotope technique in two major soil types. Fertilizer N recovery in above-ground parts was low, less than 20% in both soil types. The presence of farmyard manure tended to increase fertilizer N recovery in the acidic andic humic Nitisol but had no effect on fertilizer N recovery in near neutral humic Nitisol. Less than 3% of N applied in the first season was recovered in the second season. There is evidence of N leaching to the lower soil horizons. In the first 0.5 m of top-soil, there was approximately 25 kg N ha-1 in the acidic andic Nitisols, while between 0.5 and 2.5 m there was an accumulation of more than 450 kg N ha-1. In view of low N recovery and high N leaching, it is important to design strategies for more efficient N utilization by maize and recycling of the large quantities of N accumulated in lower soil horizons. Leaching of N to lower soil horizons may be a greater problem than anticipated by researchers and farmers, or conversely may constitute a large reserve of N.Collection: CIMMYT Publications Collection
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Conference proceedings CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Publications Collection 633.153 EDM (Browse shelf) 1 Available R624179
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Nitrogen is one of the major soil nutrients limiting maize production in the sub-humid highlands of Central Kenya. Afield experiment was designed to determine fertilizer N recovery by maize, measured by the 15N isotope technique in two major soil types. Fertilizer N recovery in above-ground parts was low, less than 20% in both soil types. The presence of farmyard manure tended to increase fertilizer N recovery in the acidic andic humic Nitisol but had no effect on fertilizer N recovery in near neutral humic Nitisol. Less than 3% of N applied in the first season was recovered in the second season. There is evidence of N leaching to the lower soil horizons. In the first 0.5 m of top-soil, there was approximately 25 kg N ha-1 in the acidic andic Nitisols, while between 0.5 and 2.5 m there was an accumulation of more than 450 kg N ha-1. In view of low N recovery and high N leaching, it is important to design strategies for more efficient N utilization by maize and recycling of the large quantities of N accumulated in lower soil horizons. Leaching of N to lower soil horizons may be a greater problem than anticipated by researchers and farmers, or conversely may constitute a large reserve of N.

English

9801|AGRIS 9702|anterior|R97-98PROCE|FINAL9798

Jose Juan Caballero

CIMMYT Publications Collection

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