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首页> 外文期刊>Applied Engineering in Agriculture >Compost: a potential value-added product for dairy operations?
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Compost: a potential value-added product for dairy operations?

机译：堆肥：乳制品运营的潜在增值产品？

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The objective of this study was to evaluate the composting potential of various bedding materials that were previously used in experimental compost bedded packs for dairy cows. Each material was placed in windrows (1.8 m high, 9.1 m long, and 2.3 m wide) from April 2007 to September 2007 and managed as needed to promote composting. Materials included: sawdust (SD) (control), corn cobs (CC), wood chip fines/sawdust mix (WC/SD), soybean straw (SS), wood chip fines/soybean straw mix (WC/SS), and soybean straw/sawdust mix (SS/SD). Replicated samples were taken weekly and analyzed for dry matter (DM). Carbon:nitrogen ratio (C:N ratio), pH, total C, total N, NH4-N, and NO3-N were measured once monthly. Temperature was measured twice weekly. Total P, total K, and EC were measured at the beginning and end of the composting period. Windrow temperatures exceeded 55 degrees C for 10 to 96 days, and coliform populations were reduced from 106 or 107 to 500 cfu/mL or fewer in all materials. CC, SS/WC, WC/SS, and SS were the only materials that decreased (P<0.05) in moisture content from day 0 to day 138. Materials were similar when comparing day 0 and day 138 for NH4-N, total N, and inorganic N concentrations. SS, SS/SD, WC/SS, and WC/SD all decreased in total C and C:N ratio (P<0.05) from day 0 to day 138. C:N ratios were below 20:1 at the end of the composting period, with the exception of SD and WC/SD. Based on these results, all materials composted during the time period and would potentially work as a soil amendment/mulch if proper composting takes place.
机译：这项研究的目的是评估以前用于奶牛的实验堆肥床上用品中的各种床上用品的堆肥潜力。从2007年4月至2007年9月，将每种物料放在堆垛中（高1.8 m，长9.1 m和宽2.3 m），并根据需要进行管理以促进堆肥。材料包括：锯末（SD）（对照），玉米芯（CC），木屑细粉/木屑混合物（WC / SD），大豆秸秆（SS），木屑细粉/大豆秸秆混合物（WC / SS）和大豆秸秆/木屑混合物（SS / SD）。每周采集复制的样品并分析干物质（DM）。每月测量一次碳：氮比（C：N比），pH，总C，总N，NH 4 -N和NO 3 -N。每周两次测量温度。在堆肥期的开始和结束时测量总磷，总钾和EC。堆肥温度超过55摄氏度持续10至96天，大肠菌群总数从10 6 或10 7 降至所有材料中的500 cfu / mL或更少。从第0天到第138天，仅有CC，SS / WC，WC / SS和SS的水分含量降低（P <0.05）。比较NH 4 < -N，总氮和无机氮浓度。从第0天到第138天，SS，SS / SD，WC / SS和WC / SD的总C和C：N比率均下降（P <0.05）。C：N比率在结束时低于20：1。除SD和WC / SD外，堆肥期。根据这些结果，所有物料在这段时间内都会堆肥，如果进行适当的堆肥，则有可能作为土壤改良剂/覆盖物。

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