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Effects of organic and mineral fertilizer nitrogen on greenhouse gas emissions and plant-captured carbon under maize cropping in Zimbabwe

OAR@ICRISAT

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Relation http://oar.icrisat.org/47/
http://dx.doi.org/10.1007/s11104-011-0753-7
 
Title Effects of organic and mineral fertilizer nitrogen on greenhouse gas emissions and plant-captured carbon under maize cropping in Zimbabwe
 
Creator Mapanda, F
Wuta, M
Nyamangara, J
Rees, R M
 
Subject Maize
 
Description Optimizing a three-way pact comprising
crop yields, fertility inputs and greenhouse gases may
minimize the contribution of croplands to global
warming. Fluxes of N2O, CO2 and CH4 from soil
were measured under maize (Zea mays L.) grown
using 0, 60 and 120 kg N hm-2 as NH4NO3-N and
composted manure-N in three seasons on clay
(Chromic luvisol) and sandy loam (Haplic lixisol)
soils in Zimbabwe. The fluxes were measured using
the static chamber methodology involving gas chromatography
for ample air analysis. Over an average of
122 days we estimated emissions of 0.1 to 0.5 kg
N2O-N hm−2, 711 to 1574 kg CO2-C hm−2 and−2.6 to
5.8 kg CH4-C hm−2 from six treatments during season
II with the highest fluxes. The posed hypothesis that
composted manure-N may be better placed as a
mitigation option against soil emissions of GHG than
mineral fertilizer-N was largely supported by N2O
fluxes during the wet period of the year, but with high
level of uncertainty. Nitrogen addition might have
stimulated both emissions and consumption of CH4
but the sink or source strength depended highly on
soil water content. We concluded that the application
of mineral-N and manure input may play an important
role with reference to global warming provided the
season can support substantial crop productivity that
may reduce the amount of N2O loss per unit yield.
Confidence in fluxes response to agricultural management
is still low due to sporadic measurements
and limited observations from the southern African
region.
 
Publisher Springer
 
Date 2011
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/47/1/narya.pdf
Mapanda, F and Wuta, M and Nyamangara, J and Rees, R M (2011) Effects of organic and mineral fertilizer nitrogen on greenhouse gas emissions and plant-captured carbon under maize cropping in Zimbabwe. Plant and Soil, 343. pp. 67-81.