First, the trench preservation method for the election of flat topography, low groundwater level, well-drained sandy soil, dig deep 30 cm, narrow width of the flat ground ditch, bottom width 30 cm wide and 90 cm wide, length limit. When the surface soil of the ditch is left to dry, use 0.1% of carbendazim to spray the ditch wall and the bottom of the ditch, and then lay a layer of sterile straw on the bottom of the ditch. Citrus side edge mining side storage, fill the ditch bottom, the middle slightly higher, the height of the fruit pile center is 35 to 40 cm. Then cover a layer of straw with a thickness of 10 to 15 cm and make it a ridge-type. The temperature in the ditch is maintained at 6 to 9°C and the relative humidity is 85%. Second, the biogas preservation method in the citrus store room, every 2 to 3 days into a biogas, citrus per pass 50 kg of methane volume of 0.038 cubic meters, can reduce the oxygen content in the storage environment, play a preservation effect. The storage period is up to 150 days and the good fruit rate is above 90%. Third, the fine sand preservation law prepares clean sand, the humidity uses the hand to form the group to disperse to fall is appropriate, the storage room must sweep clean, uses the fumigation method to disinfect 1 times. Put a layer of fine sand on the bottom of the storage container, put a layer of citrus on the fine sand, then cover the fine sand on top of the citrus, successively stack several layers, check once every half month, remove the rotten fruit, Keep fresh for 3 to 5 months. Fourth, sawdust preservation method will be sawdust dried to a moisture content of 10%, in the wooden box or carton bottom pad 20 cm thick wood, a layer of oranges, a fruit pedicle upward; then covered with a layer of sawdust, followed by full Full box, finally covered with wood chips 3 cm thick, covered with lid, placed in a cool and ventilated place. Using this method to keep fresh for 108 days, the good fruit rate can reach 91%. China Agricultural Network Editor
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