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African Crop Science Journal
African Crop Science Society
ISSN: 1021-9730
EISSN: 2072-6589
Vol. 2, No. 1, 1994, pp. 69-77
Bioline Code: cs94011
Full paper language: English
Document type: Research Article
Document available free of charge

African Crop Science Journal, Vol. 2, No. 1, 1994, pp. 69-77

 en Synchrony Relationships of Nitrogen Release and Plant Uptake in a Zimbabwean Sandy Soil Amended with Manure and Fertiliser Nitrogen
Murwira, H.R

Abstract

A study was conducted to assess N mineralization and plant uptake patterns in a sandy soil amended with cattle manure and inorganic N applied at zero or six weeks after planting. Manure was applied at a rate equivalent to 10 t ha -1 and the N at 100 kg ha -1 . Nitrogen mineralization, uptake and leaching in the field were estimated by an in situ incubation technique. Estimated N uptake was compared with the actual N uptake measured from maize plants. All manure treatments showed an initial immobilization of N in the first 8 weeks. Early application of N resulted in significantly more N mineralization in the manure compared to application at 6 weeks after planting. Estimated values of N leaching ranged between 0.67 g m-2 and 4.22 g m-2 which is 3% to 42% of applied N. Greatest amounts were leached from the N treatments. Nitrogen recovery ranged from less than 0% to 69% of applied N.

Keywords
Manure, nitrogen release, plant uptake

 
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