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摘要
En 中文
Abstract
In the last 2 decades, 2 cultivars of lettuce (Lactuca sativa L.) have dominated the western U.S. lettuce industry. The first, ‘Calmar’ was released by the University of California in 1960. For several years in the mid-1960's, it was planted on nearly all the spring, summer and early fall acreage in the Salinas Valley and other coastal districts in California. It is a large, vigorous cultivar of the Great Lakes type. The second, ‘Vanguard’, was released by the USDA in 1958 and for many years has been the mainstay cultivar for early spring production in the Imperial Valley and other desert districts. Each cultivar has spawned a group of selections, a ‘Calmar’ group and a ‘Vanguard’ group, which have increased the adaptive range of the original cultivars.
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