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Fertilization programs used commercially for bell peppers ( Capsicum annuum ) in the subtropical Lower Rio Grande Valley of Texas may vary substantially from recommendations based on research. Therefore, a commercial fertilization program used on a significant fraction of the pepper production in this area was evaluated at two locations. Preplant soil tests showed NO 3 -N levels were low at one location and very high at the other. Nitrogen application where preplant soil NO 3 -N was low resulted in a six-fold yield increase (from 197 to 1203 kg·ha –1 ), and improvements in fruit weight, fruit volume, fruit density, wall thickness, wall strength, and carotenoid and chlorophyll a and b contents. No other nutrient application at either location or N application at the site where preplant soil NO 3 -N levels were high significantly affected yield by size class, fruit quality characteristics, storage properties, or mineral and organic components. Nitrogen application had the greatest effect on dry-weight accumulation and N uptake during fruit set and maturation when N demand was high. Where N responses were observed, N application increased total dry weight in plant and fruit by 150% and total N uptake by 186%, yet this increase amounted to a N fertilizer uptake efficiency of only 12%. Thus, N should be used judiciously to prevent pollution of drainage and ground waters.

hortscience

Evaluation of Five Different Plant Nutrients for Their Effect on Yield, Quality, and Postharvest Condition of Bell Peppers in a Subtropical Environment