Abstract
Experiments were conducted at the North Carolina State Univ. Phytotron facility in late Summer and Fall 1996. Bell and jalapeno pepper were grown in polystyrene flats using continuous float irrigation. Using DIF (the difference between day and night temperatures), three temperature treatments consisting of positive (+DIF), zero (0DIF), and negative (–DIF) DIF were assigned to three growth chambers. DIF treatments were imposed in each chamber for only the first 2 hr after lights were turned on. Half of the plants in each chamber were brushed twice a day. Height was affected by cultivar, brush treatment, DIF treatment, and all combinations of the three treatments at all sampling dates. Jalapeno pepper experienced greater height reductions due to DIF or brushing treatment than bell pepper. Shoot fresh weight was reduced by brushing at all sampling dates, but DIF was less effective. Length of first internode was influenced by brush and DIF treatments, while leaf area was only affected by brush treatment which caused reductions of 13% and 25 % in bell and jalapeno pepper, respectively, at 6 weeks after planting. Brushing increased pepper stem diameter. DIF had little effect on stem diameter but in combination with brushing effectively increased stem diameter over both cultivars.
Published Version
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