Pepper transplants (Capsicum annuum L.) held under simulated transit conditions synthesized substantial amounts of ethylene, the rate of which was temperature dependent. Transplants treated with known concentrations of ethylene (0, 0.1 to 10.0 μ1/liter) were substantially defoliated at levels lower than those that may be produced in transit by the plants themselves. Exposure to ethylene concentrations of 0.5 jul/liter and greater impeded the growth of transplants after planting into the field. Removal of ethylene in storage with potassium permanganate greatly reduced abscission. Elevated storage CO2 levels stimulated ethylene synthesis by as much as 34%.
Pepper (Capsicum frutescens L.) and summer squash (Cucurbita pepo var. melopepo (L.) Alef.) were grown in immediate succession in undisturbed beds using trickle irrigation with various treatments. Highest combined yield in metric tons/ha for both crops was obtained with film mulch + soil fumigation (117.6) followed by film mulch (112.3), soil fumigation (93.4) and control (69.0), respectively. Yield from the second crop was negatively correlated (r=−.87) with the degree of plant infection with root-knot nematode (Meloidogyne incognita (Kofoid & White) Chitwood). Intensive production in this manner allows fixed costs to be defrayed over two crops thus increasing the magnitude of return per dollar invested. Multiple cropping of pepper and squash with trickle irrigation has an excellent potential in south Georgia provided nematodes and other soil-borne pathogens can be adequately controlled.
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