IngentaConnect Regulating mineral N release and greenhouse gas emissions by mixi...

Authors: Kaewpradit; Toomsan¹; Vityakon¹; Limpinuntana¹; Saenjan¹; Jogloy¹; Patanothai¹; Cadisch

Source: European Journal of Soil Science, Volume 59, Number 4, August 2008 , pp. 640-652(13)

Abstract:

Summary

Groundnut as a pre-rice crop is usually harvested 1-2 months before rice transplanting, during which much of legume residue N released could be lost. Our objectives were to investigate the effect of mixing groundnut residues (GN, 5 Mg ha⁻¹) with rice straw (RS) in different proportions on: (i) regulating N dynamics, (ii) potential microbial interactions during decomposition, and (iii) associated nitrous oxide and methane emissions at weekly intervals during the lag phase until rice transplanting (i, ii) or harvest (iii). Decomposition was fastest in groundnut residues (64% N lost) with a negative interaction for N loss when mixed 1:1 with rice straw. Adding groundnut residues increased mineral N initially, while added rice straw led to initial microbial N immobilization. Mineral N in mixed residue treatments was significantly greatest at the beginning of rice transplanting. Soil microbial N and apparent efficiency were higher, while absolute and relative microbial C were often lowest in groundnut and mixed treatments. Microbial C:N ratio increased with increasing proportion of added rice straw. N₂O losses were largest in the groundnut treatment (12.2 mg N₂O-N m⁻² day⁻¹) in the first week after residue incorporation and reduced by adding rice straw. N₂O-N emissions till rice harvest amounted to 0.73 g N₂O-N m⁻² in the groundnut treatment. CH₄ emissions were largest in mixed treatments (e.g. 155.9 g CH₄ m⁻², 1:1 treatment). Mixing residues resulted in a significant interaction in that observed gaseous losses were greater than predicted from a purely additive effect. It appears possible to regulate N dynamics by mixing rice straw with groundnut residues; however, at a trade-off of increased CH₄ emissions.

Document Type: Research article

DOI: 10.1111/j.1365-2389.2008.01021.x

Affiliations: 1: Department of Plant Science and Agricultural Resources, Faculty of Agriculture, Khon Kaen University, Khon Kaen 40002, Thailand

The full text electronic article is available for purchase. You will be able to download the full text electronic article after payment.

$44.84 plus tax

Regulating mineral N release and greenhouse gas emissions by mixing groundnut residues and rice straw under field conditions