Effect of straw mulching on drought resistance of summer maize in upland red soils

Gao, Xue-Tao; Wang, Wei; Xie, Xiao-Li; Yin, Chengqing; Chen, Anlei

doi:10.3724/sp.j.1011.2013.01193

Cited by 1 publication

(3 citation statements)

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“…Besides, removal of early rice straw is beneficial for land preparation for late rice, resulting in less straw burning. Furthermore, it is dry season when early rice is harvested, and straw mulching can relieve drought and improve soil fertility of rainfed upland5816. Meanwhile, straw nutrition recycling is also important for maintaining paddy soil fertility51842.…”

Section: Discussionmentioning

confidence: 99%

“…The transfer of straw from paddy to upland may lead to higher nutrient use efficiency according to Liebig’s law of minimum. Previous studies showed that the ex situ application of rice straw not only substituted equivalent amounts of chemical fertilizers but also increased soil fertility and crop yield5816.…”

Section: Discussionmentioning

confidence: 99%

“…Upland soils are usually characterized with low organic matter and nutrients, poor structure, high acidity, and low water retention1516. A few studies have reported that transferring surplus rice straw from paddy system to upland system is an effective practice to improve organic matter, fertility, and productivity of upland soils58.…”

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Mitigating effects of ex situ application of rice straw on CH4 and N2O emissions from paddy-upland coexisting system

Wang

Chen

et al. 2016

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The in situ application of rice straw enhances CH4 emissions by a large margin. The ex situ application of rice straw in uplands, however, may mitigate total global warming potential (GWP) of CH4 and N2O emissions from paddy-upland coexisting systems. To evaluate the efficiency of this practice, two field trials were conducted in rice-rice-fallow and maize-rape cropping systems, respectively. Year-round measurements of CH4 and N2O emissions were conducted to evaluate the system-scaled GWP. The results showed that CH4 accounted for more than 98% of GWP in paddy. Straw removal from paddy decreased 44.7% (302.1 kg ha−1 yr−1) of CH4 emissions and 51.2% (0.31 kg ha−1 yr−1) of N2O emissions, thus decreased 44.8% (7693 kg CO2-eqv ha−1 yr−1) of annual GWP. N2O accounted for almost 100% of GWP in upland. Straw application in upland had insignificant effects on CH4 and N2O emissions, which increased GWP only by 91 kg CO2-eqv ha−1 yr−1. So, the transfer of straw from paddy to upland could decrease GWP by 7602 kg CO2-eqv ha−1 yr−1. Moreover, straw retention during late rice season contributed to 88.2% of annual GWP increment. It is recommended to transfer early rice straw to upland considering GWP mitigation, nutrient recycling and labor cost.

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