De Antoni Migliorati M of Institute for Future Environments, Healthy Ecosystems and Environmental Monitoring. Nitrous Oxide Emissions from Sorghum Crops with Distinct Cropping Histories. Kingaroy, Queensland, 2012 - 2013 [Theme: Integrated Cotton and Grain Cropping Systems].
datalibrarian.158.12
(http://www.n2o.net.au/knb/metacat/datalibrarian.158.12/html).
N2O emissions were measured in plots planted with sorghum (Sorghum bicolor L.) following two distinct cropping histories. One crop rotation (hereafter called legume ley pasture-cereal) included two seasons of alfalfa pasture (Medicago sativa, L., summers 2009/2010 and 2010/2011), one season of maize (Zea mays, L., summer 2011/2012) and one season of sulla pasture (Hedysarum coronarium L., winter 2012) prior to sowing sorghum. The other crop rotation (hereafter called grass ley pasture-cereal) consisted of two seasons of a mixed rhodes grass (Chloris gayana, K.) and alfalfa pasture (summers 2009/2010 and 2010/2011), one season of maize (Zea mays, L., summer 2011/2012) and one season of wheat (Triticum aestivum L., winter 2012). Both crops were terminated in November 2012 with all residues returned to the soil as a mulch before being incorporated into the soil with four shallow cultivations. Two N fertilisation rates were tested on each cropping history, resulting in a total of four treatments. The first N application rate was designed to achieve maximum yield potential and was representative of farming practices of the region. The synthetic N rate used in L70 was reduced compared to G100 to assess whether the estimated 30 kg N ha-1 resulting from the mineralisation of the sulla residues would have been available to sorghum.
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Rank Name | Rank Value | Common Names |
---|---|---|
Genus | Chloris | |
Species | Gayana | Rhodes Grass |
Rank Name | Rank Value | Common Names |
---|---|---|
Genus | Hedysarum | |
Species | Coronarium | Sulla |
Rank Name | Rank Value | Common Names |
---|---|---|
Genus | Medicago | |
Species | Sativa | Alfalfa |
Rank Name | Rank Value | Common Names |
---|---|---|
Genus | Sorghum | |
Species | Bicolor | Sorghum |
Rank Name | Rank Value | Common Names |
---|---|---|
Genus | Triticum | |
Species | Aestivum | Wheat |
Rank Name | Rank Value | Common Names |
---|---|---|
Genus | Zea | |
Species | Mays | Maize |
December 2012 - September 2013
Two N fertilisation rates were tested on each cropping history, resulting in a total of four treatments: · Sorghum in legume ley pasture-cereal rotation, no fertilisation (L0); · Sorghum in legume ley pasture-cereal rotation, sorghum fertilised with a total of 70 Kg N ha-1 (L70). · Sorghum in grass ley pasture-cereal rotation, no fertilisation (G0); · Sorghum in grass ley pasture-cereal rotation, sorghum fertilised with a total of 100 Kg N ha-1 (G100); Treatments G100 and L70 were base dressed at planting banding 20 kg N ha-1 as urea. On 15 January 2013, at growth stage 3 (eight leaf stage), both treatments were inter-row cultivated and side dressed with banded urea, receiving 80 kg N ha-1 (G100) and 50 kg N ha-1 (L70). The N application rate for G100 was designed to achieve maximum yield potential and was representative of farming practices of the region. The synthetic N rate used in L70 was reduced compared to G100 to assess whether the estimated 30 kg N ha-1 resulting from the mineralisation of the sulla residues would have been available to sorghum.
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