Extractable Soil Phosphorus and Inorganic Nitrogen following Application of Raw and Anaerobically Digested Swine Manure

Abstract

Processing of swine (Sus scrofa domestica) manure in an anaerobic Due to a potential increase in the use of anaerobic digester for biogas production is not a complete waste treatment process. Therefore, digested manure must be utilized in some manner, digestion systems for energy production, there is need most likely as a source of plant nutrients. The objective of this study for a reliable estimate of plant-available N and P in diwas to compare the effect of raw and digested liquid swine manure gested swine manure. Evaluation of digested manure as application on soil test P (STP) and inorganic N. A laboratory incubaa crop nutrient source requires determination of the eftion study was conducted for 112 d, with a factorial combination of fects of digestion on nutrient content and the ability to raw manure, digested manure, and inorganic fertilizer at five nutrient provide plant-available nutrients when the material is rates (0, 12.5, 25, 37.5, and 50 mg total P kg Ϫ1 and 0, 50, 100, 150, applied to land. and 200 mg total N kg Ϫ1). Raw and digested swine manure produced Nutrient release from manure at a time when crops the same NH 4-N disappearance, NO 3-N formation, net inorganic N, are not actively assimilating nutrients can cause low nuand increase in STP. Routine STP methods estimated similar P recovtrient use and poor crop response. Binder et al. (1996) ery with both manure sources, averaging 21% at the end of incubation. For the first 28 d of incubation, the STP levels were higher for fertilizer state the importance of synchronizing manure nutrient than manure; STP levels were similar for all P sources after 28 d. mineralization with crop use. Also, environmental loss Nitrification of manure NH 4 was rapid, reaching background concenof nutrients can occur when supply exceeds crop detrations by 14 d, with conversion rate similar to fertilizer NH 4-N. By mand. One problem in manure management is the unthe end of incubation, maximum net extractable inorganic N, precertainty of organic matter mineralization rate. Specific dominantly NO 3-N, averaged 20% less than total applied N for both animal digestion processes (monogastric or ruminant), raw and digested manure. Anaerobic digestion did not substantially feed preferences, and rations of different species and affect manure nutrient supply, and we conclude that anaerobically overall handling of the manure are responsible for difdigested liquid swine manure can provide similar plant-available N ferences in manure nutrient concentrations and effects and P as expected from raw swine manure.

Closing the Global Energy and Nutrient Cycles through Application of Biogas Residue to Agricultural Land – Potential Benefits and Drawback

“…Conversely, Loria and Sawyer [77] reported that raw and digested swine manure generated similar net inorganic N and mineralization, although the chemical oxygen demand (COD) was significantly decreased after digestion. Rubaek et al .…”

Environmentally Sustainable Biogas? The Key Role of Manure Co-Digestion with Energy Crops

“…No credits for mineral fertiliser replacement are given to the digestate because the fertilizing properties of digestate and raw manure are considered equivalent in the long term [39][40][41]. Fertiliser credits are not given to energy crops systems as the digestate produced is recycled in the same fields where the crops are grown, and the reduced need for mineral fertiliser is already accounted for.…”

Nutrients in soil layers under no-tillage after successive pig slurry applications

“…Nitrification rates may vary from 0.98 to 1.53 kg ha -1 day -1 in manured soils, as observed by Aita et al (2006) in an assessment carried out four days after pig slurry applications of 40 and 80 m 3 ha -1 , respectively, and all ammoniacal N present in manure can be nitrified within 10 days after manure application (Chantigny et al, 2001). This rapid transformation of ammoniacal N to N-NO 3 -significantly increases the concentration of N-NO 3 -in soil (Loria & Sawyer, 2005). However, accumulation of N-NO 3 -in soil occurs in the first days after pig slurry application (Chantigny et al, 2004;Assmann et al, 2007;Adeli et al, 2008) and decreases over time due to its transfer by runoff (Smith et al, 2001a;Ceretta et al, 2010) and, mainly, percolation (Daudén et al, 2004;Basso et al, 2005;Bergström & Kirchmann, 2006), as it forms an outer-sphere complex with low binding energy with surface functional groups of reactive soil particles.…”