. Agri-news. Agriculture. amendments—fertilizer, manure and top soil—improved wheat yields on eroded soils. Fertilizer (112 of nitrcgen and 34 of phosphorous) consistently increased yi Bids 30 to 40 , no matter what the depth of erosion or the soil type. Manure, applied at a rate of 34 tons per acre dry weight, markedly increased yields. "The manure was especially beneficial on the more deeply eroded soils where it had a positive effect on soil tilth and seedbed quality," he says. Returning topsoil had the same effect he adds, restoring productivity as well as g
. Agri-news. Agriculture. amendments—fertilizer, manure and top soil—improved wheat yields on eroded soils. Fertilizer (112 of nitrcgen and 34 of phosphorous) consistently increased yi Bids 30 to 40 , no matter what the depth of erosion or the soil type. Manure, applied at a rate of 34 tons per acre dry weight, markedly increased yields. "The manure was especially beneficial on the more deeply eroded soils where it had a positive effect on soil tilth and seedbed quality," he says. Returning topsoil had the same effect he adds, restoring productivity as well as greatly improving soil tilth and seedbed quality on the highly eroded plots. "While the yields did improve, the full production potential of the soil before it was eroded wasn't recovered. There's a message there for producers about preventing soil erosion, and for us as researchers looking for answers abou; soil amendments, their combinations and agronomic management," Solberg says. At the two central Alberta sites, one in the Black soil zone near Josephburg and the other on Gray Wooded soil near Cooking Lake, top yields were recorded on fertilized plots with no topsoil removed. (See chart). The Josephburg site had a 77 yield and Cooking Lake's was slightly lower at 73 "Our observations were what we expected: that soil erosion reduces yield and that erosion limits producer management options," Solberg says. Marvin Nyborg, a University of Alberta co-operative researcher, says dramatic yield reductions were especially true at the Cooking Lake site, "since there is only 10 to 12 cm of rather cruddy topsoil to begin with". He adds, "The yield reduction at the Josephburg site was somewhat surprising since there's 25 to 30 cm of Alberta's best soil ; For example at the Josephburg site, fertilized plots with 20 cm of topsoil mechanically removed yielded almost 54 , 23 less than the plot with no eroded tops
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