Effect of Sewage Sludge Application on Growth Parameters and Uptake of Micronutrients by Poplar Nursery

Field study was conducted to study the effect of different doses of sewage sludge and its combination with chemical fertilizers on growth parameters and uptake of micronutrients by poplar nursery.Sixteen treatments were applied namely control, 50% RDF (recommended dose of fertilizers), 75% RDF, 100% RDF, 5 t/ha SS (sewage sludge), 10 t/ha SS, 15 t/ha SS, 50% RDF + 5 t/ha SS, 50% RDF + 10 t/ha SS, 50% RDF + 15 t/ha SS, 75% RDF + 5 t/ha SS, 75% RDF + 10 t/ha SS, 75% RDF + 15 t/ha SS, 100% RDF + 5 t/ha SS, 100% RDF + 10 t/ha SS and 100% RDF + 15 t/ha SS.The treatments were applied in randomized block design in three replications in the field having loamy sand soil texture.The growth parameters (height and collar diameter) differed significantly among various treatments.Concentration and uptake of micronutrients (Fe, Mn, Cu, Zn and Ni) by poplar nursery were analysed.In comparison to other treatments, concentration and uptake of micronutrients were significantly higher at 50% RDF + 15 t/ha SS and 75% RDF + 10 t/ha SS.Litterfall had the highest concentration of nutrients, followed by roots and shoots.The soil's micronutrient build-up peaked at 100% RDF + 15 t/ha SS.It is advised to use either 50% RDF + 15 t/ha SS or 75% RDF + 10 t/ha SS to ensure healthy poplar nursery growth and for saving of inorganic fertilizers.