1, the integrity of the base. The land of the base should be a complete plot, and there can be no formal production plots, but organic transformation plots are allowed; There must be obvious signs at the junction of organic vegetable production base and conventional plots, such as rivers, hills, artificial isolation belts, etc.

2. There must be a transition period. It usually takes two years to change from conventional production system to organic production, and then the sown vegetables can be used as organic products after harvest; Perennial vegetables need three years to become organic crops before harvesting. The start time of the conversion period is calculated from the date of applying for certification from the certification body, and the producers must operate in full accordance with the requirements of organic production during the conversion period. Vegetables planted in the field after 1 year organic transformation can be sold as organic transformation crops.

3. Establishing a buffer zone If some plots in the organic vegetable production base are likely to be polluted by adjacent conventional plots, a buffer zone or physical barrier must be set between the organic and conventional plots to ensure that the organic plots are not polluted. Different certification bodies have different requirements on the length of the isolation belt. For example, the OFDC certification body in China is 8m, and the BCS certification body in Germany is10m.