A method of increasing nitrogen use efficiency in eucalyptus

Abstract

The application discloses a method for improving nitrogen utilization rate of eucalyptus in the field of forestry cultivation, and the method comprises the following steps: deep ploughing a forest land before planting, spraying and shallow harrowing a prepared activator containing citric acid, humic acid and ammonium molybdate after measuring the nitrogen content of the soil, and then mixing the activator; ditching and applying MPCM material along the planting row and covering the soil, and applying a microbial activator containing N acyl homoserine lactone, trehalose and potassium dihydrogen phosphate through drip irrigation to make the root system moderately contact with the material; mixing controlled loss nitrogen fertilizer with MPCM material and then annular ditching at the planting period, fast-growing period and before the forest is closed; and spraying nutrient solution containing amino acid chelated nitrogen, urea and trace elements on the leaves in time by monitoring the rhizosphere soil and leaf nitrogen status. The MPCM material is prepared by pyrolyzing eucalyptus residues to obtain a biochar base, doping with metal and grafting with an intelligent polymer, and then loading nitrogen-fixing bacteria and ammonifying bacteria to be activated, so that the nitrogen is accurately supplied and efficiently utilized, and the growth benefit of eucalyptus is effectively improved.

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