Employing in situ SCUBA methods, a seasonal carbon budget has been established for a Larninaria saccharina population in a Scottish sea-loch. Concurrent studies of photosynthesis, secretion rates, reserve fluctuations and frond growth were undertaken. Net annual production is in excess of 120 g C m-2 yr-L Over I3 ~ of gross carbon input is released as extracellular secretions (over 30 % in autumn) and 40-50 % is lost by distal decay, entering detrital food chains. The large concentrations of laminarin, synthesised in summer months, are nearly all lost in autumn-winter distal tissue loss and therefore not available for early spring growth.

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Studies to evaluate the effectiveness of low rates of ethephon in removing late-season squares and small bolls from cotton was conducted at Little Rock and Florence, SC in 1988. Ethephon at 0, 0.14, 0.28, 0.56, and 0.84 kg/ha was applied to cotton with terminal regrowth following cutout. Rates of 0.56 and 0.84 kg/ha caused significant abscission of fruiting forms within three days of application. Yield was not affected.

Growth and fruiting pattern of okra (Abelmoschus esculentus L. Moench) cv. Clemson Spineless as affected by the growth regulators Alar (N -dimethylaminosuccinamic acid) and ethephon (2-chloroethyl phosphoric acid) were evaluated in field studies. Eight treatments consisting of Alar at 600, 1200, 2400, and 3600 μl·liter-1 and ethephon at 200, 400, 600, and 800 μl·liter-1 and water control were applied as foliar sprays at the three- to four-true-leaf stage. Both growth regulators depressed shoot growth and leaf production. Ethephon reduced shoot length. Total fruit yield was not significantly affected by the treatments. However, ethephon-treated plants tended to produce fewer fruits and lagged behind Alar-treated plants and the control plants in Fruit production during the early harvests.