Minimum spacing studies for lettuce
Author AffiliationsDavid Ririe is Farm Advisor, Monterey County.
Hilgardia 26(1):6-7. DOI:10.3733/ca.v026n01p6. January 1972.
Two possibilities exist as ways to eliminate hand thinning in lettuce production: (1) to combine precision planting with the use of a selective thinner; and (2) to plant to a stand, utilizing improved seed environment control with respect to plant protection, soil crust prevention, and moisture control. Regardless of which system the grower chooses, he must decide on a minimum spacing that can be tolerated, without sacrificing head size, quality or yield. If the thinner is used, the cutting mechanism should be set to leave plants as close as possible to that minimum spacing. If planting to a stand is practiced, then the minimum spacing will result in maximum plant population, thereby giving better yield insurance to cover any loss of stand. The purpose of this study was to determine the minimum plant spacing that could be tolerated without yield or quality loss under field conditions.
Also in this issue:Evaluation of certain acaricides and insecticides for effectiveness, residues, and influence on crop flavor
Production research… and environmental quality
Influence of rootstock on bloom period of Bartlett pear after a mild winter
Virgin female traps aid control survey for omnivorous leaf roller in San Joaquin Valley vineyards
Single-cut harvesting of chrysanthemums for commercial marketing
Weed control studies in tomatoes, 1968–70
Safflower production under minimum and maximum soil preparation in Imperial Valley
Dormant sprays with experimental insecticides for control of peach twig borer