Comparative Evaluation of Animal Manures and Their Ashes on Soil pH and Electrical Conductivity in some Southwestern Nigerian Soils

Responses of soil organic carbon stock to animal manure application: A new global synthesis integrating the impacts of agricultural managements and environmental conditions

“…First, although the amount of manure‐C was found as the most important factor accounting for the spatial variation in SOC stock changes (Figure 3), the rate of SOC stock change dramatically decreased with increasing manuring duration (Figure 5b). Moreover, overuse of manure may cause other negative effects on soil and environment quality such as nutrient leaching (Cui et al, 2020; Edmeades, 2003; Lewis & Makarewicz, 2009), soil salinization (Guo et al, 2019; Olowoboko et al, 2018; Ozlu & Kumar, 2018), and GHG emissions (Ren et al, 2017; Thangarajan et al, 2013; Zhou et al, 2017). Therefore, pursuing maximum SOC accrual through excessive manure application may be not feasible from both agricultural and environmental perspectives, especially in regions where the efficiency of manure is limited by other factors such as soil condition.…”

“…Second, long-term manure application can also cause soil pH difference between the manured treatment and non-manured reference, leading to their difference in SOC decomposition. These soil pH differences were usually positive in many cases (Cai et al, 2019;Lu et al, 2017;Olowoboko et al, 2018;Ozlu & Kumar, 2018;Wang et al, 2019;Ye et al, 2019), indicating faster SOC decomposition in manured treatment than in non-manured reference. Conceptually, manuring-induced soil pH difference is negatively correlated with initial soil pH, since the reaction equilibriums of related processes are highly dependent on the pH difference between manure and soil.…”

“…Moreover, manure application can cause multiple changes in soil physiochemical (Bhogal et al, 2009; Cai et al, 2015; Ozlu & Kumar, 2018) and biochemical (Kallenbach, & Grandy, 2011; Liu et al, 2020; Ye et al, 2019) properties, which may, in turn, influence its retention efficiency in soil. For example, long‐term manure application usually leads to an increase in soil pH (Lin et al, 2019; Olowoboko et al, 2018; Wang et al, 2019; Ye et al, 2019), mainly through the adsorption of acidic cations (e.g., H + and Al 3+ ) and the hydrolysis of alkaline groups. Although soil pH has been found as a key edaphic factor controlling SOC decomposition (Chen et al, 2016; Kemmitt et al, 2006; Liu et al, 2018; Ye et al, 2018; Zhang, Guo, et al, 2020), the potential influence of manuring‐induced soil pH change on its efficiency in sequestering carbon has not been addressed.…”

Cash for trash: an agro-economic value assessment of urban organic materials used as fertilizers in Cameroon

“…The second group, which consisted of the composts, had an N Fig. 2 Analytical data (moisture, N, P 2 O 5 , K 2 O, organic matter content, and humus potential) for the raw manures and composts collected in Bafoussam (B) and Yaoundé (Y) and comparison with the data reported in the literature (Li) (in g 100 g -1 DM) for (i) hen droppings (Agarry et al 2010;Dekker et al 2012;Edwards and Daniel 1992;Li et al 2015;Nicholson et al 1996;Olowoboko et al 2018;Pan et al 2009), (ii) rabbit manure (Chabalier et al 2006;Ciesielczuk et al 2017;Dinuccio et al 2019;Gómez-Brandón et al 2013;Lazcano et al 2013;Li et al 2015;Moral et al 2005;Moreno-Caselles et al 2002;Paredes et al 2015;Wu et al, 2010;Youssef and Eissa 2017), (iii) goat manure (Agarry et al 2010;Al-Kindi et al 2016;Azeez et al 2010;Cavalcante et al 2010;Haidar et al 2003;Kafle and Chen 2016;Lopez Fernandez et al 2018;Mafongoya et al 2000;Olowoboko et al 2018;Paredes et al 2015;Shamsul et al 2018;Zhang et al 2013), (iv) pig manure (Adesanya et al 2016;Bernal et al 2009;Dhyani et al 2018;Hamm et al 2016;Hjorth et al 2010;Karimi et al 2018;Li et al 2015;Moreno-Caselles et al 2002;...…”