Explanation:

Horticulture is a wide field which includes a great variety and diversity of crops. Pomology is the study of fruit crops. Olericulture is the study cultivation of vegetables. Floriculture is the study of cultivation of flower crops. Plantation crops is the study of cultivation of coconut, arecanut, rubber, coffee, tea, etc. Spices crops is the study of cultivation of cardamom, pepper, nutmeg etc. Medicinal and aromatic crops is the study cultivation of medicinal and aromatic crops.