TECHNOLOGY FOCUS - AGRICULTURE - Preferred Components: The harvested straws without fruits or seeds are residual straw bodies of rice, wheat and vegetables e.g. stems, branches, leaves, and fruit parts of tomatoes, chilli, gourd vine, bitter gourds and cucumber stems and leaves. Preferred Method: The adding amount of calcium superphosphate is 0-5 wt.%, magnesium sulfate is 0-6 wt.% and urea is 3-5 wt.%, and when composting rice and wheat straws, 3-5 wt.% of urea is added to adjust nitrogen-carbon ratio, when composting vegetables, 2-5 wt.% of calcium superphosphate and 3-6 wt.% of magnesium sulfate are added to reduce the nitrogen loss in the fermenting process.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The exiting straw pulverizer and two feeding device, which can rotate corresponding to each other are arranged vertically between a feeding hole and a pulverizing device. The two feeding devices are two shafts with toothed sheets, where the diameter of the shafts are 15-20 cm. The distance between two shafts is 1 cm. The shafts are as long as the pulverizer. The toothed sheets are arranged on the shafts alternatively at 90 degrees . The teeth are 50 mm long, 50 mm wide and 5 mm thick. The tooth distance is 50 mm and the toothed sheets are cast with the shafts. The shafts are fixed on a support of the outer shell of the pulverizer, and are connected to the drive wheel of the pulverizer by belts or gears, where the drive wheel provides the power and the shafts on the feeding device are fixed on the pulverizer in elastic manner. The shaft on the pulverizer is fixed on the outer shell of the pulverizer, and when over-feeding, the shaft can move upward 1-2 mm, realizing continuously feeding. When the residual vegetables with thick stems pass into the feeding device, the residual vegetables can be crushed, when the vine vegetables pass into the feeding device, the rough feeding caused by the propelling force caused by the rotation of the blades of the pulverizer is avoided.