Mitigation of potentially hazardous and malodor compounds emitted from animal waste is needed to improve the sustainability of livestock agriculture. Bacteria control the generation of these compounds and also depend on the pH of manure. Influencing swine manure pH, especially on the liquid-air interface, may lead to a reduction of emission of odorous and hazardous compounds. The objective of this experiment was to test highly alkaline and porous (HAP) modified biochar with pH = 9.2 and red oak (RO) biochar with pH = 7.5 influence on swine manure pH acquired from the outdoor storage and deep pit storage under a barn. HAP and RO biochars were topically applied on the outdoor-stored (pH = 7.55), and pit (pH = 8.00) manures and spatial pH (every 1 mm of depth) were measured on days 0, 2, and 4. Results showed that HAP biochar increased outdoor-stored manure pH on day 4, particularly within the top 10 mm of depth, where pH ranged from 7.79 to 8.90, while in the case of RO pH ranged between 7.46 and 7.66, i.e., similar to control (7.57–7.64). Both biochars decreased pit-stored manure pH within the top 10 mm of depth (in comparison with the control pH of 8.36–8.47) to 8.19–8.30 (HAP), and 8.18–8.29 (RO) on day 4. However, differences were not considerable. The reason for the insignificant effect of biochars on pit manure was likely due to its higher buffer capacity in comparison with the outdoor-stored manure.

需要减轻从动物废物中散发出来的潜在危险和恶臭化合物，以提高畜牧业的可持续性。细菌控制着这些化合物的产生，并且还取决于肥料的pH值。影响猪粪的pH值，尤其是在液-气界面上，可能导致减少有味和有害化合物的排放。本实验的目的是测试pH = 9.2的高碱性和多孔（HAP）改性生物炭和pH = 7.5的赤栎（RO）生物炭对猪场在室外和深谷仓中粪肥获得的pH值的影响。将HAP和RO生物炭局部施用在室外储存的pH值为7.55的土壤上，并在第0、2和4天测量粪坑（pH值为8.00）的粪便和空间pH值（每1毫米深）。结果表明，HAP生物炭在第4天增加了户外存储的粪便pH值，特别是在深度最大的10 mm以内，pH值在7.79至8.90之间，而在RO的情况下，pH值在7.46至7.66之间，即类似于对照（7.57–7.64）。两种生物炭在最高深度10毫米内（与对照pH值8.36–8.47相比）将粪便存储的粪便pH值降低至第4天的8.19–8.30（HAP）和8.18–8.29（RO）。不大。生物炭对粪便肥料影响不大的原因可能是由于其比室外储存的粪便具有更高的缓冲能力。两种生物炭在最高深度10毫米内（与对照pH值8.36–8.47相比）将粪便存储的粪便pH值降低至第4天的8.19–8.30（HAP）和8.18–8.29（RO）。不大。生物炭对粪便肥料影响不大的原因可能是由于其比室外储存的粪便具有更高的缓冲能力。两种生物炭在最高深度10毫米内（与对照pH值8.36–8.47相比）将粪便存储的粪便pH值降低至第4天的8.19–8.30（HAP）和8.18–8.29（RO）。不大。生物炭对粪便肥料影响不大的原因可能是由于其比室外储存的粪便具有更高的缓冲能力。