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103529
Crop Residues Morris et al 2010
Description
Advanced Agronomy (Establishment) Mind Map on Crop Residues Morris et al 2010, created by labradorlass on 22/05/2013.
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advanced agronomy
establishment
advanced agronomy
establishment
Mind Map by
labradorlass
, updated more than 1 year ago
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Created by
labradorlass
over 11 years ago
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Resource summary
Crop Residues Morris et al 2010
Reduced maize emergence
Slows soil warming and drying
2.5C lower
Lengthens emergence due to thermal time
Conserves more soil mc during high water demand
conserves less than ploughing
hence no yield effect
Standing residues retain heat better than flat residues
affects...
OM
breaks down to increase OM
binds soil particles
soil temp
soil moisture
soil erodibility
seed germination
hence remove residues via ploughing
produces phytotoxins
affects seedling establishment
reduces tillering
yellows leaves
reduces yield
produces spindly stems
Erosion
heavy machinery aids erosion
reduces OM due to frequent operations
non-inversion reduces run off
hence reduces...
nitrate leaching
emissions from nutrients and pesticides
sediment losses
significantly reduced water run off
residues protect soil from wind erosion
reduces crust formation
high risk in low OM and high silt soils
Seedbed
stable soils are better under non-inversion
for silty soils plough is better
smaller aggregate size gives better emergence
Bouaziz and Hicks 1990
no plough pan but compaction still occurs
limits soil mineral nitrogen (SMN)
straw has high C:N ratio
rapidly immobilises SMN
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