Effect of Sequential Planting, Plant Replacement, and Planting Date on Marketable Yield of Bell Pepper, Capsicum annuum var. annuum L.
Earliest plantings of the bell pepper cv. Pip were on 16 May 1990 and 15 April 1991 at Lane, Okla. Additional plantings were at monthly intervals through July. Peppers were harvested weekly. Plants of the earliest plantings had marketable yields of approximately 21 Mg. ha-'. Marketable yields of later plantings were no higher than 8.6 Mg, ha-'. Combined marketable yields of sequential monthly lantings increased marketable yield to approximately 36 Mg.ha-(I a 1.7 fold increase over the earliest planting alone. W~th the earliest planting removed and peppers immediately replanted in June or July 1990 or May through July 1991, the marketable yield from subsequent plantings did not equal the marketable yield lost with the earliest planting maintained. Results showed sequential planting, with the earliest planting being no later than early May in the South Central United States, to be a viable method to increase marketable yield of bell pepper.
Sequential Planting for Single-Harvest Vegetables
ABSTRACT At Lane, Oklahoma, bell pepper (Capsicum annuum var. annuum L., cv. ‘Pip’) was followed in sequence with cucumber (Cucumis sativus L., cv. ‘Calypso’), or processing tomato (Lycopersicon esculentum L., cv. ‘Early Pear’), or bunch onion (Allium cepa [L.] Cepa group, cv. ‘Crystal Wax White’). Each crop was harvested once. Each sequence was begun monthly from mid-April to mid-July in each of two years, and with three fertilizer rates (recommended rate [1-fold], and 1.5- and 2-fold the recommended rate). For the earliest planting in both years, the time to first frost was long enough for a third crop. The fourth planting failed in both years. Tomato yields were below normal. The bell pepper and cucumber sequence had the highest yields for the first two planting dates. Increasing fertilizer rate reduced bell pepper yield, but had little effect on yield of crops planted in sequence with bell pepper. Further research is needed to determine how sequencing other crops will affect yield.
Row Cover Effects on Air and Soil Temperatures and Yield of Muskmelon

Three row covers (spunbonded polyester, double-slitted, and perforated polyethylene) used in combination with clear polyethylene mulch and trickle irrigation for muskmelon (Cucumis melo L.) production in 1985 and 1986, increased soil (5-cm depth) minimum and maximum temperatures and air (15-cm height) maximum temperatures compared to clear mulch alone. Increased minimum air temperatures resulted from the use of all row covers in 1985. All row covers enhanced earliness in both years. However, in 1985, there were no total marketable yield differences; in 1986, total marketable yield was greater with the spunbonded and double-slitted row covers than with the no row cover treatment. Within row cover treatment, the use of the perforated row cover in 1986 resulted in lower total marketable yields than with the spunbonded row cover. Excessive air temperatures with the perforated row cover may have resulted in reduced marketable yield. Lower minimum air temperatures in 1986 may have resulted in lower yields than in 1985.