Measurements of Soil Carbon Dioxide Emissions from Two Maize Agroecosystems at Harvest under Different Tillage Conditions
Table 1
Crop management practices in the two sites (CT = conventional tillage site, NT = no-tillage site). All dates are referred to year 2012.
CT site
NT site
Plowing
(i) 21 May 30 cm depth tillage, mouldboard plough (ii) 22 May Harrow clods reduction
No-tillage
Species and cultivar
Zea mays cv Pioner P0222
Zea mays cv Decalb 6903
Sowing date
23 May
27 April
Sowing technique
Seedbed prepared using harrows/cultivators (1-2 passes)
Sod-seed
Seed population
7.8 seed m−2
8.6 seed m−2
Interrow spacing
70 cm
70 cm
Fertilizations
(i) 15 May Cattle manure: 100 m3 ha−1 C : N = 9.7, N: 200 kg ha−1 (ii) 23 May Perphosphate (46% of P), 30 Kg ha−1 (iii) 10 June Urea (46% of N), 150 kg ha−1
(i) 27 April Ammoniumsulphate N/S 21 : 24, 150 kg ha−1 Diammoniumphosphate N/P 18 : 46, 60 kg ha−1 (ii) 19 May 2012 Urea (46% of N), 175 kg ha−1
Irrigations
(i) 9 July 2012 Flooding (2000 m3 ha−1 per irrigation) (ii) 6 August 2012 Flooding (2000 m3 ha−1 per irrigation)
(i) 5 July 2012 Flooding (2000 m3 ha−1 per irrigation) (ii) 27 July 2012 Flooding (2000 m3 ha−1 per irrigation)
Open field weeding
(i) 21 June 2012 Du Pont “Codacide” 1.0 L ha−1 Syngenta “Callisto” 0.5 L ha−1 Du Pont “Titus ultra” 50 g ha−1 (ii) 2 October 2012 Dow “Hopper” (glyphosate), 3.5 L ha−1
(i) 27 April 2012 Syngenta “Force” 12 kg ha−1 (ii) 28 April 2012 Bayer “Merlin Gold” 1.2 L ha−1 Dow “Hopper” (glyphosate) 3 L ha−1 (iii) 26 May 2012 Du Pont “Codacide” 1.3 L ha−1 Syngenta “Callisto” 0.5 L ha−1 Du Pont “Titus ultra” 42 g ha−1 (iv) 8 October 2012 Dow “Hopper” (glyphosate), 3 L ha−1
Weedings within SASSFLUX
(i) 16 July Dow “Hopper” (glyphosate) 3 L ha−1 (ii) 28 September Dow “Hopper” (glyphosate) 3 L ha−1 (iii) 24 October Dow “Hopper” (glyphosate) 3 L ha−1
(i) 16 July Dow “Hopper” (glyphosate) 3 L ha−1 (ii) 28 September Dow “Hopper” (glyphosate) 3 L ha−1 (iii) 24 October 2012 Dow “Hopper” (glyphosate) 3 L ha−1
Harvest date
2 September
22 August
Harvest technique
One combined harvester (thresher and chopper machine for silage) Two tractors with wagon for fine
One combined harvester (thresher and chopper machine) Two tractors with wagon for fine