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Nitrogen leaching and indirect nitrous oxide emissions from fertilized croplands in Zimbabwe

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Relation http://oar.icrisat.org/6099/
http://dx.doi.org/10.1007/s10705-012-9528-7
 
Title Nitrogen leaching and indirect nitrous oxide emissions
from fertilized croplands in Zimbabwe
 
Creator Mapanda, F
Wuta, M
Nyamangara, J
Rees, R M
 
Subject Fertilizer Appications
 
Description Agricultural efforts to end hunger in Africa are hampered by low fertilizer-use-efficiency exposing applied nutrients to losses. This constitutes
economic losses and environmental concerns related to leaching and greenhouse gas emissions. The effects of NH4NO3 (0, 60 and 120 kg N ha-1) on N uptake, N-leaching and indirect N2O emissions were studied during three maize (Zea mays L.) cropping seasons on clay (Chromic luvisol) and sandy loam (Haplic lixisol) soils in Zimbabwe. Leaching was measured using lysimeters, while indirect N2O emissions were calculated from leached N using the emission factor methodology. Results showed accelerated N-leaching (3–26 kg ha-1 season-1) and N-uptake (10–92 kg ha-1) with N input. Leached N in groundwater had potential to produce emission increments of 0–94 g N2O-N ha-1 season-1 on clay soil, and 5–133 g N2ON ha-1 season-1 on sandy loam soil following the
application of NH4NO3. In view of this short-term response intensive cropping using relatively high N rate may be more appropriate for maize in areas whose
soils and climatic conditions are similar to those investigated in this study, compared with using lower N rates or no N over relatively larger areas to attain a
targeted food security level.
 
Publisher Springer Netherlands
 
Date 2012
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/6099/1/NCA_94_85-96_2012.pdf
Mapanda, F and Wuta, M and Nyamangara, J and Rees, R M (2012) Nitrogen leaching and indirect nitrous oxide emissions from fertilized croplands in Zimbabwe. Nutrient Cycling in Agroecosystems, 94. pp. 85-96. ISSN 1573-0867