EFFECT OF ORGANIC AMENDMENTS ON RESTORING PRODUCTIVITY OF ERODED CALCAREOUS SOIL

The effect of organic and inorganic amendments on restoring of productivity in an eroded Dark Brown Chernozemic soil was studied under incubation and chamber conditions at Lethbridge Research Center. Alberta, Canada. The results shows that hug manure, poultry manure and composted cattle manure have the best effects of restoring productivity to eroded soil. Fresh cattle manure got lower yield and it's better to apply as a composted status. There was no short-term restoration effects for alfalfa hey, lentil hey, oat green and wheat straw. The restoring effects of organic amendments on productivity were better than phosphorus fertilizer. The availability of phosphorus in poultry manure was greatest among all manures. The amount of available P released by hog manure was highest. The P supply of composted cattle manure was most stable during the experiment. Wheat straw released least available P, so the effect of restoring productivity was lower. The immobilization of phosphorus fertilizer in soil was greater. Organic manure not only supplies enough phosphorus, but also protect its available P from soil fixation and promote plant absorption of phosphorus. The correlation between Olsen-P and Resin-P in manure and plant yield were significant, but the Olsen-P is better than Resin-P as an indicator of soil available P.