Method of preparing wood chip-type mixed organic composite fertilizer

A method of preparing a wood chip-type organic composite fertilizer, the method comprising the steps of:

• {circle around (a)} preparing wood chips by chipping at least one region of an outer bark-stripped unsawn timber, a bough, and a root into chips having a diameter of 1 to 4 cm;
• {circle around (b)} preparing a liquid organic fertilizer by blending 73.0 to 80.0 wt % of an organic by-product, 6.1 to 9.0 wt % of a nutrient in which nitrogen (N), phosphorous (P) and potassium (K) are mixed at a weight ratio of (1):(0.1 to 0.4):(1.0 to 5.0), and 13.9 to 18.0 wt % of water (H2O);
• {circle around (c)} forming an organic mixed solution by mixing 75.0 to 85.6 wt % of the liquid organic fertilizer of the step {circle around (b)} with 0.10 to 5.0 wt % of a water-dispersible binder and 14.3 to 20.0 wt % of a colorant;
• {circle around (d)} obtaining colored wood chips by simultaneously immersing the colored wood chips of the step {circle around (a)} in the organic mixed solution of the step {circle around (c)} and applying hot air to the organic mixed solution at a temperature of 120 to 200° C. for 30 to 40 seconds to coat the woods chips with colors;
• {circle around (e)} drying the wood chips to a high temperature between 120 to 200° C. to remove moisture formed on an outer surface of the wood chips of the step {circle around (d)} and to make the organic mixed solution penetrate evenly into the wood chips at the same time;
• and
• {circle around (f)} packing the dried wood chips of the step {circle around (e)} by a predetermined weight unit, wherein drying of the wood chips in the step {circle around (e)} comprises the steps of:
• transferring the wood chips through a conveyor, and drying the wood chips by applying hot air toward a conveyor belt from an air blower or a heater at the same time;
• secondly drying the wood chips by transferring the dried wood chips to a rotary dryer through the conveyor, and applying hot air to the wood chips within the rotary dryer;
• and
• transferring the secondly dried wood chips to a discharger through the conveyor to discharge the wood chips from the discharger, and applying hot air to the wood chips from the air blower or the heater to thirdly dry the wood chips at the same time.