LZ, let me introduce you to some:
Dong Jiao gezhuang vegetable planting base.
Address: 500 meters north of the village Committee of Dongjiaozhuang Village, Yangzhen District.
Tel: 0 10-68663344
Beijing linong vegetables planting base
Address: West of Guogezhuang Village, Mafang Town
Tel: 0 10-609960 18.
Beijing en quan di da vegetables planting base
Address:No. 1 East Street, Zhangxinzhuang Village, Lehe Town, Du Nan, Pinggu District.
Beijing lijia vegetables planting base
Address: Duogezhuang, Mafang
Beijing yongkun vegetables planting base
Address: unknown
Fangshan District: Beijing Chen Zhuo Animal Husbandry Co., Ltd., Hancunhe Vegetable Garden, Green Jufu Distribution Center, Haotianyuan American Black Swan Breeding Base in liangxiang town.
Daxing District: Jinwei Beef Cattle Breeding Base, Zhangziying Vegetable Science and Technology Demonstration Zone, Le Yi Dairy Cow Cooperative and Yinghai Million Meat Duck Breeding Base.
Tongzhou District: Liyuan Black-bone Chicken Breeding Base and Wu Yujia Vegetable Planting Base.
Miyun County: vegetable garden in Jingliyuan Village, Henan Province, and mutton sheep breeding base in Tianhe Garden.
Shunyi District: Shunxin Agricultural Store Seed Farm, Liqiao Vegetable Standardized Planting Base, Beiwu Town Vegetable Base, Lvjian Modern Agriculture Co., Ltd. (pigs), Jin Xin Mutton Sheep Breeding Base, Xiongte Dairy Cattle Breeding Base and Yingte Mutton Sheep Breeding Base.
Pinggu District: Beijing Hualifeng Agricultural Products Planting Co., Ltd. and Dahuashan Xiaoyuzi Big Peach Production Base.
Huairou District: Changshaoying Broiler Breeding Base, Liulimiao Sturgeon Breeding Base Yanqing County: Xiaofengying Vegetable Planting Base, Jiuxian Town Dairy Cattle Breeding Base, Deqing Source Company Laying Hen Farm.
Mentougou District: Beijing Bikun Special Food Production and Marketing Center, Xiantan Rare Bird Breeding Base and Yongding Town Mutton Sheep Breeding Base.
Chaoyang District: Cuigezhuang Township Export Vegetable Planting Base
Fengtai District: Nangong Vegetable Planting Base
Changping District: Flourishing Age Enriching Mutton Sheep Breeding Base Haidian District: Sujiatuo Meat Dairy Cattle Breeding Base of Jinxiu Dadi Company.
I really can't find some contact information. Please look again.