Impact of Crop Straw and Other Conditions on the Release of Green-house Gases from a Wheat-Maize Rotation Site

The economy in China<!–[if supportFields]> XE “China” <![endif]–><!–[if supportFields]><![endif]–> is very much based on agriculture<!–[if supportFields]> XE “agriculture” <![endif]–><!–[if supportFields]><![endif]–> and therefore this was the ideal location to carry out a study on means for reducing greenhouse gas emissions from soil. Lui et al (2011) wanted to study the emissions of nitrous oxide<!–[if supportFields]>XE “nitrous oxide (N2O)”<![endif]–><!–[if supportFields]><![endif]–> and nitric oxide from soil by observing the reaction of organic residue in the form of both wheat and maize<!–[if supportFields]> XE “maize” <![endif]–><!–[if supportFields]><![endif]–> straw that were applied to the soil along with the amount of N<!–[if supportFields]>XE “nitrogen, N”<![endif]–><!–[if supportFields]><![endif]–><!–[if supportFields]> XE “nitrogen” <![endif]–><!–[if supportFields]><![endif]–> fertilization<!–[if supportFields]> XE “fertilization” <![endif]–><!–[if supportFields]><![endif]–> applied. They found that nitrous oxide and nitric oxide emissions did decreased along with yield. Furthermore, the level of N fertilization under the improved treatment was better vis-à-vis the greenhouse gas emissions and yield as opposed to the level of N fertilization under the conventional treatment.Nitya Chhiber
Chen, D., Han, S., Liu, C., Meng, S., Yang, Z., Zheng, X., Zhou, Z., 2011. Effects of irrigation, fertilization<!–[if supportFields]>XE “fertilization” <![endif]–><!–[if supportFields]><![endif]–> and crop straw management on nitrous oxide<!–[if supportFields]> XE “nitrous oxide (N2O)” <![endif]–><!–[if supportFields]><![endif]–> and nitric oxide emissions from a wheat–maize<!–[if supportFields]> XE “maize” <![endif]–><!–[if supportFields]><![endif]–> rotation field in northern China<!–[if supportFields]> XE “China” <![endif]–><!–[if supportFields]><![endif]–>.Agriculture, Ecosystems & Environment 140, 226–233. doi:10.1016/j.agee.2010.12.009

The plots of land that were chosen in this study were based in a province in China<!–[if supportFields]> XE “China” <![endif]–><!–[if supportFields]><![endif]–> that had cinnamon soil, and a temperate, continental climate. During this study, the land on which these plots were located was going through a cycle of cultivation from wheat to maize<!–[if supportFields]> XE “maize” <![endif]–><!–[if supportFields]><![endif]–>. Half of the plots did not receive any straw whereas the other half did. There were five different scenarios in total: two scenarios were characterized by different levels of N<!–[if supportFields]> XE “nitrogen, N” <![endif]–><!–[if supportFields]><![endif]–><!–[if supportFields]> XE “nitrogen” <![endif]–><!–[if supportFields]><![endif]–> fertlisation, two scenarios were related to straw – the lack or the presence of straw. Finally the last scenario was characterized by no fertilization<!–[if supportFields]> XE “fertilization” <![endif]–><!–[if supportFields]><![endif]–> and the presence of straw. Finally, the emissions of nitric oxides and nitrous oxide<!–[if supportFields]> XE “nitrous oxide (N2O)” <![endif]–><!–[if supportFields]><![endif]–>s were measured using chambers in an automated measuring system. The relationship between conditions in soil such as soil temperature, soil moisture and the emissions of nitrous oxides and nitric oxides was described by using non-linear regression.
The presence of organic residue increased yields of both wheat and maize<!–[if supportFields]> XE “maize” <![endif]–><!–[if supportFields]><![endif]–>, and  the lack of any fertilizer<!–[if supportFields]> XE “fertilizer” <![endif]–><!–[if supportFields]><![endif]–> decreased them. The overall water management and N<!–[if supportFields]> XE “nitrogen, N” <![endif]–><!–[if supportFields]><![endif]–><!–[if supportFields]> XE “nitrogen” <![endif]–><!–[if supportFields]><![endif]–> fertilization<!–[if supportFields]> XE “fertilization” <![endif]–><!–[if supportFields]><![endif]–> application levels under the improved treatment condition were better for the soil and especially for the level of maize yields than under conventional treatment. Furthermore, the level of nitric oxide and nitrous oxide<!–[if supportFields]> XE “nitrous oxide (N2O)” <![endif]–><!–[if supportFields]><![endif]–> emissions decreased under improved treatment. Both nitric oxide and nitrous oxide emission levels increased in the presence of high soil temperature, which could be explained by the fact that higher soil temperatures allow a greater level of activity by nitrifiers and denitrifiers.
It is not only the addition or the application of materials that can be used in agriculture<!–[if supportFields]> XE “agriculture” <![endif]–><!–[if supportFields]><![endif]–>. The effect of increasing yields should also be studied. Furthermore, one should note that agricultural sequestration<!–[if supportFields]>XE “sequestration” <![endif]–><!–[if supportFields]><![endif]–> is a process but concepts such as that of carbon footprint do exist, which provide a parallel type of application of this same process.

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