TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Roller: In the roller for accumulating and mixing organic fertilizers, in the formula of the helix line (L), the C(0) is equal to 0, C(1) is equal to nS' divided by (1 plus n) 3.14, C(2) is equal to (1 minus n) S' divided by 4(1 plus n) multiplying two power to 3.14, where S' is the length of the helix line area of roller, n is the radical speed ratio of helix lines, the values are from 2 to 4; the radical speed ratio of helix lines is defined as: when the roller rotates with some certain angle speed, the fertilizers will roll along the helix lines, the ratio between the radical speed at the initial end of the helix line where the fertilizer rotate and the radical speed of the terminal of the helix line is the radical speed ratio of helix lines. The length ratio among the left helix line (4) is, the right helix line area (5) and the accumulating area (6) between them is 2:2:0.8 to 2:2:1.2. The helix line area on both sides of the roller are respectively distributed with 1 to 3 lines, and distributed symmetrically on the circumference. The helix blades (2) is comprised of a main body of blades (9), and the two ending heads, the main bending head (7) and side bending head (8) set on the main body of blades (9), the main body of blades (9) is in shape of rectangle with an angle with the bending head ranging from 120 degrees to 150 degrees . The crossing point (a) of the two edges without connection with the main and the side bending beads of the main body (9) of blades is distributed on the helix line (L), the point (b) on the same side with the crossing point (a) and on the edge being opposite to the crossing edge between the side bending head (8) and the main body of blades is distributed on the helix line (L). On the same roller, the number of the blocking boards is above and beyond or equal to the number of the left or the right helix lines, the number of the blocking boards is 3 to 6, one side of the blocking board is connected with the roller, the other side is set with a being head of blocking board, the angle between the main body (11) of blocking board and the bending head (10) of blocking board is from 120 degrees to 150 degrees . The left and right helix areas are also set with anti-skid boards (12), the anti-skid boards are rectangles, the length is the same as the length of the helix blades, and the width is the same as the height of the blocking board. The blocking boards respectively are connected with the left and right helix lines, when the number of the blocking board is above and beyond the number of the helix lines on single edge, the left ends of the blocking board will are connected with the anti-skid board (12), the angle between the anti-skid board (12) and the main body (11) of the blocking board is 120 degrees to 150 degrees . The helix line blades, the blocking boards and the roller are all connected with the knife holder by adopting the helix planting knifes, the knife holder (13) is welded on the roller, there is also a reinforcing board (14) between the knife holder and the roller to fix the knife holder, the blades, and the blocking boards are respectively welded with screw bolts (15) with screw bolts, and are connected with the knife holder by screw threads.