Influence of basin‐based conservation agriculture on selected soil quality parameters under smallholder farming in Zimbabwe
Influence of basin‐based conservation agriculture on selected soil quality parameters under smallholder farming in Zimbabwe
复制标题
流域保护性农业对津巴布韦小农耕作下选定土壤质量参数的影响
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
M. Wuta
中科院分区：
文献类型：
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作者：
J. Nyamangara;A. Marondedze;E. Masvaya;T. Mawodza;R. Nyawasha;K. Nyengerai;R. Tirivavi;P. Nyamugafata;M. Wuta
本研究旨在确定基于流域的保护性农业（CA）对选定土壤质量参数的影响。配对图2004年至2007年，在农田土壤上建立了0.01公顷的保护性耕作和基于畜力犁的传统耕作（CONV），（12-18% -桑迪壤土和桑迪粘壤土）或高粘土含量（>18-46% -桑迪粘土和粘土），作为在津巴布韦小农户农业区的六个地区推广保护性耕作的一个正在进行的项目的一部分。我们假设，CA将提高土壤有机碳（SOC），容重，团聚体稳定性，土壤水分和入渗速率。2011年，从玉米地0 - 15 cm深度采集土壤样品，用于SOC和团聚体稳定性分析，并从0 - 5、5 - 10和10 - 15 cm深度采集土壤样品，用于容重和土壤持水量分析。CA处理的土壤有机碳含量、土壤有机碳储量、团聚体稳定性、容重、孔隙体积和保水性均有所提高。结果与假设是一致的，我们的结论是，CA提高土壤质量的小农农业。然而，在高粘性土壤中的效益更大，这与针对撒哈拉以南非洲小农耕作地区的做法有关。
The research was carried out to determine the effect of basin‐based conservation agriculture (CA) on selected soil quality parameters. Paired plots (0.01 ha) of CA and conventional tillage based on the animal‐drawn mouldboard plough (CONV) were established between 2004 and 2007 on farm fields on soils with either low (12–18% – sandy loams and sandy clay loams) or high clay levels (>18–46% – sandy clays and clays) as part of an ongoing project promoting CA in six districts in the smallholder farming areas of Zimbabwe. We hypothesized that CA would improve soil organic carbon (SOC), bulk density, aggregate stability, soil moisture retention and infiltration rate. Soil samples for SOC and aggregate stability were taken from 0 to 15 cm depth and for bulk density and soil moisture retention from 0 to 5, 5 to 10 and 10 to 15 cm depths in 2011 from maize plots. Larger SOC contents, SOC stocks and improved aggregate stability, decreased bulk density, increased pore volume and moisture retention were observed in CA treatments. Results were consistent with the hypothesis, and we conclude that CA improves soil quality under smallholder farming. Benefits were, however, greater in high clay soils, which is relevant to the targeting of practices on smallholder farming areas of sub‐Saharan Africa.