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Intercropping kura clover with prairie cordgrass grown on a marginal land enhanced soil carbon and nitrogen fractions
Soil Science Society of America Journal ( IF 2.9 ) Pub Date : 2021-05-07 , DOI: 10.1002/saj2.20274
Gandura Omar Abagandura 1, 2 , Sandeep Kumar 1
Affiliation  

Prairie cordgrass (PCG) (Spartina pectinata Link) has been the focus of much scientific attention recently for use in biofuel applications, as it grows well on marginal lands that are unsuitable for row crops. This study investigated how the intercropping of kura clover (KC) (Trifolium ambiguum M. Bieb) with PCG for 8 yr affects soil carbon (C) and nitrogen (N) fractions compared with N fertilization on marginally yielding croplands in South Dakota. This study was initiated in 2011 with five treatments: intercropping PCG with KC (PCG-KC), and PCG with N fertilizer at four levels: 0 kg N ha–1 (PCG-0N), 75 kg N ha–1 (PCG-75N), 150 kg N ha–1 (PCG-150N), and 225 kg N ha–1 (PCG-225N). Soil samples were collected in 2018 and analyzed for permanganate oxidizable C and N, stable C and N, mineralized C and N, dissolved organic C and N, and particulate organic C and N. Further, C and N management indices were calculated from these data. Results showed that permanganate oxidizable C and N and particulate organic C and N were generally higher under PCG-KC than under PCG-0N and PCG-75N but similar to PCG-150N and PCG-225N. Dissolved organic C and N and C mineralization were higher under PCG-KC compared with fertilized and unfertilized PCG. Prairie cordgrass–kura clover (190.10) recorded a 91% higher N management index than PCG-75N (99.66) but was similar to PCG-150N (165.70) and PCG-225N (163.10). This study concludes that growing KC–PCG mixture rather than using N fertilizers would have an overall positive effect on marginally yielding cropland soils.

中文翻译:

将库拉三叶草与生长在边缘土地上的草原草本植物提高土壤碳和氮含量

草原草本植物 (PCG)(Spartina pectinata Link)最近在生物燃料应用中的使用引起了很多科学关注,因为它在不适合大田作物的边缘土地上生长良好。本研究调查了在南达科他州的边际产量农田上,与施氮相比,库拉三叶草 (KC) ( Trifolium ambiguum M. Bieb) 与 PCG间作8 年对土壤碳 (C) 和氮 (N) 组分的影响。该研究于 2011 年启动,采用五种处理方式:PCG 与 KC 间作 (PCG-KC),以及 PCG 与 N 肥料在四个水平上:0 kg N ha –1 (PCG-0N)、75 kg N ha –1 (PCG- 75N)、150 kg N ha –1 (PCG-150N) 和 225 kg N ha –1(PCG-225N)。土壤样品于 2018 年采集并分析了高锰酸盐可氧化碳和氮、稳定碳和氮、矿化碳和氮、溶解有机碳和氮以及颗粒有机碳和氮。 此外,根据这些数据计算了碳和氮管理指数. 结果表明,高锰酸盐可氧化碳和氮和颗粒有机碳和氮在 PCG-KC 下普遍高于 PCG-0N 和 PCG-75N,但与 PCG-150N 和 PCG-225N 相似。与施肥和未施肥 PCG 相比,PCG-KC 下溶解的有机 C 和 N 和 C 矿化更高。草原草-库拉三叶草 (190.10) 的氮管理指数比 PCG-75N (99.66) 高 91%,但与 PCG-150N (165.70) 和 PCG-225N (163.10) 相似。
更新日期:2021-05-07
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