Browse on keywords: fertility WA heavy metals
Search results on 12/11/18
82. Lerch, R.N., K.A. Barbarick, D.G. Westfall, R.H. Follett, T.M. McBride, and W.F. Owen. 1990. Sustainable rates of sewage sludge for dryland winter wheat production. 1. Soil nitrogen and heavy metals.. J. Production Agric. 3:60-65.
This study determined that a 3 T/ac rate was the maximum allowable for the dryland wheat-fallow system. The sludge significantly increased heavy metal concentrations in the soil at all loading rates. Increased ntirates in the root zone resulted from a 12 T/ac sludge rate, compared to a 50 lb N/ac fertilizer application.