Effects of Application of Irradiated Sewage Sludge on Growth of Ornamental Plants
The sewage sludge irradiated to eliminate the pathogenic organisms and ascarid ova was applied into flower substrate for investigating the effects on the growth of ornamental plants.The pot experiment indicated that the substrate increased the plant length, diameter and leaf area, which can be used to substitute nitrogen fertilizer and leaf mold partially for monstera deliciosa liebm, arum, Chinese rose and lawn grass,the best dose for the first 3 plants was 80 t·hm~(-2) and 60 t·hm~(-2) for the last one. The growth of the plants was constrained when more sludge was applied. The electron conductivity was almost 40 times than that of controlled soil and pH reduced 1.6 in pot soil treated with sewage sludge of 120 t·hm~(-2), which may have caused the constraint of plant growth.