Abstract
Plant growth experiments in pots were conducted to evaluate methods to supplement the efficiency of fertilizer in dairy cattle slurry by dissolving recycled dry chemical extinguishing agents (DC) in the slurry and also by adding chemical fertilizers (CF) to slurry that is applied to grass and vegetables. The yield and fertility efficiency of timothy and greens (Komatsuna) in DC and CF plots were compared with those in a plot in which only chemical fertilizers were applied (CL). The experiments used four types of slurry (fresh, aerobically digested, anaerobically digested, and stored at a dairy farm). The yield of timothy, whether with DC or CF, was almost always equal to or more than the yield of CL. The digested slurry with DC led to the highest yield. The yield of Komatsuna in DC was more than that of CF or that of CL across all slurry types. The nitrogen and potassium efficiency of timothy differed little from plot to plot. The phosphate efficiency with DC was remarkably higher than in other plots. The fertilizer efficiency on Komatsuna, whether with DC or CF, was higher than that with CL. The supplementation of the fertilizer efficiency of dairy cattle slurry by the dissolution of DC is found to be quite effective, as it sustains yields that nearly equal or even exceed those with the application of chemical fertilizers. Additionally, the recycling of fertility resources increases the efficiency of agricultural operations, reduces labor, and reduces the costs of chemical fertilizers.
