Impact of nutrition soil from construction soil and WWTP sludge compost on growth of landscape plants
建筑弃土与污泥堆肥混合配制营养土对园林植物的影响

Nutrient soil produced from the mixture of construction soil and (wastewater treatment plant, WWTP) sludge compost was applied in growing landscape plants. The performance of garden balsams from seeding to blooming period was observed and analyzed by pot-culture experiments to verify the application of the as-prepared nutrient soil on growing landscape plants. The results show that: (1) the application of the as-prepared nutrient soil conducts a positive influence on the growth of impatiens due to the rich nutrients; (2) the growth indices of garden balsams in experiments are positively proportional to the ratios of the WWTP compost in the nutrient soil, reaching maximum at the percentage of 30%; (3) heavy metals in the nutrient soil act as an inhibiting factor of the growth of garden balsams, especially to the part above the earth surface, and the inhibition take places mainly during the seeding and growing periods; however, this inhibition effect decreases as garden balsams grow, and mitigates evidently in the mature period; (4) the application of the nutrient soil leads to a significant increase of the biomass of garden balsams up to 550% at maximum, meeting the living condition of plants growth; (5) the optimum application rate of the nutrient soil on garden balsams is determined to be 30% under the experimental conditions by the fuzzy evaluation.