Intensive open-air cultivation of vegetable crops (tomatoes and lettuce) in California,USA

Climatic conditions in California are so favourable that intensive outdoor horticultural production is economically feasible despite the inconvenience and expense of long-distance transport to high population centres in NE and N Central USA. Processing tomatoes typify the warm season, machine-harvested, outdoor crops, and crisp-headed lettuce the cool season, fresh market, hand-harvested crops. Cultural practices, including control of weeds, pests and diseases, are outlined.