Availability of Reaction Products of Fertilizer Phosphorus to Alfalfa and Bromegrass Seedlings

Abstract

Increasing the period of contact of 3"P-lated in the NH,-F soluble fraction arrd 30Vo labelled Ca(H,PO,). fertilizer with an alkaline in the NaOH-soiuble fraction. I-ess than 6Vo soil at rates of 35 and 70 pgP/g soil before was recovered in the H,SO,-soluble fraction.qlanting alfalfa and bromegrass dicreased the Uptake of fertilizer P b! aftalfa and bromedry matter yie_ld and uptake of fertilizer P by griss was negatively i:orrelated with the the plants at five weeki. Fractionation of the NaOH-soluble iractioir whereas the uptake bv soil P, accordin_g to Chang and Jackson, alfalfa was positively associated riitfr tiri, showed that 50% of the applied P accumu-NHnCl-soluble fraction.