Here is the list of few Agriculture Colleges located in Coimbatore which you are looking for.
Agricultural College and Research Institute (AC&RI)
Coimbatore, Tamil Nadu
(0422) 6611210
(0422) 6611410

Courses Offered
B.Sc. (Agriculture)

Agricultural Engineering College and Research Institute
Coimbatore, Tamil Nadu
(0422) 5511255
(0422) 2456478, 2431672

Courses Offered
M.Tech. (Farm Power & Machinery)

Forest College and Research Institute (FCRI)
Kotagiri Road Mettupalayam
Coimbatore, Tamil Nadu
(04254) 222010

Courses Offered
Ph.D. (Agroforestry)
B.Sc. (Forestry)
M.Sc. (Forestry)
Ph.D. (Silviculture)

Home Science College and Research Institute
Coimbatore, Tamil Nadu
0452) 2422684, 2424922
9489056725
(0452) 2423433

Courses Offered
Post Graduate Diploma in Food Technology

Institute of Forest Genetics and Tree Breeding
P.B. No. 1061, R.S. Puram
Coimbatore, Tamil Nadu
(0422) 2484100, 2484101
(0422) 2430549

Salim Ali Centre for Ornithology and Natural History
Anaikatty
Coimbatore, Tamil Nadu
(0422) 2657101, 2657102, 2657131, 2657199
(0422) 2657088

School of Postgraduate Studies
Coimbatore, Tamil Nadu
(0422) 6611461, 6611261
(0422) 6611343

Courses Offered
M.Sc. (Agriculture)
Ph.D. (Agriculture)

Sugarcane Breeding Institute (SBI)
Coimbatore, Tamil Nadu
0422) 2472621
(0422) 2472923

Tamil Nadu Agricultural University (TNAU)
Lawley Road, Pappanaicken Pudur,
Coimbatore, Tamil Nadu
(0422) 6611210, 6611200, 6611251
(0422) 431672, 6611410

Courses Offered
B.Sc. (Agriculture)
B.Sc. (Horticulture Science)
M.Sc. (Soil Science & Agricultural Chemistry)
M.Sc. (Horticulture-Vegetable Science)
M.Sc. (Forestry)
M.Sc. (Soil Conservation & Water Management)
B.Sc. (Sericulture)
B.Sc. (Agriculture Business Management)
B.Sc. (Forestry)
M.Sc. (Agricultural Economics)
M.Sc. (Agricultural Entomology)
M.Sc. (Agricultural Extension Education)
M.Sc. (Agricultural Microbiology)
M.Sc. (Agronomy)
M.Sc. (Crop Physiology)
M.Sc. (Genetics and Plant Breeding)
M.Sc. (Plant Pathology)
M.Sc. (Seed Science & Technology)

UPASI Tea Research Foundation
Nirar Dam (po), Valparai
Coimbatore, Tamil Nadu
(04253) 235201, 235301, 235303
(04253) 235302

Vanavarayar Institute of Agriculture
Manakkadavu Pollachi
Coimbatore, Tamil Nadu
(04253) 290147, 236030, 236040, 236050
9942908410
(04253) 236060, 236070

Courses Offered
B.Sc. (Agriculture)
M.Sc. (Agronomy)
Diploma in Horticulture
B.Sc. (Horticulture Science)
Diploma in Agriculture
M.Sc. (Genetics and Plant Breeding)
M.Sc. (Agricultural Economics)
M.Sc. (Entomology)