Fruit yield and gas exchange in bell peppers after foliar application of boron, calcium, and Stimulate

ABSTRACT The objective of this study was to evaluate the effect of the isolated and combined foliar application of boron, calcium, and the plant growth regulator Stimulate on fruit yield and gas exchange in bell peppers. The evaluated treatments were boron, calcium, Stimulate, boron + calcium, boron...

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Published inHorticultura brasileira Vol. 36; no. 4; pp. 498 - 503
Main Authors Zeist, André R, Zanin, Daniel S, Camargo, Cristhiano K, Resende, Juliano TV de, Ono, Elizabeth O, Rodrigues, João D
Format Magazine Article
LanguageEnglish
Published 01.12.2018
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Summary:ABSTRACT The objective of this study was to evaluate the effect of the isolated and combined foliar application of boron, calcium, and the plant growth regulator Stimulate on fruit yield and gas exchange in bell peppers. The evaluated treatments were boron, calcium, Stimulate, boron + calcium, boron + Stimulate, calcium + Stimulate, boron + calcium + Stimulate, and control (water). The study was performed in complete randomized block design with three replicates. The applications were performed biweekly on the plant leaves from the beginning of flowering (December 21, 2013) until March 1, 2014. The analyzed gas exchange characteristics were photosynthetic yield, internal CO2 concentration, and transpiration rate. The evaluated agronomic characteristics were number and yield of marketable and non-marketable fruits, and the average mass, volume, and firmness of commercial fruits. The foliar application of boron from the beginning of flowering increased the photosynthetic yield and the yield of marketable fruits cultivated in the field. The foliar application of calcium and Stimulate did not improve gas exchange and fruit yield. The most common effects of boron were an increase in the number of marketable fruits. Moreover, foliar spraying with calcium from the beginning of flowering increased the firmness of commercial fruits RESUMO Objetivou-se com este trabalho avaliar o efeito da aplicação foliar isolada e combinada dos nutrientes boro e cálcio e do regulador de crescimento vegetal comercial Stimulate na produção de frutos e nas trocas gasosas do pimentão. Os tratamentos foram boro; cálcio; Stimulate; boro + cálcio; boro + Stimulate; cálcio + Stimulate; boro + cálcio + Stimulate; e testemunha (água), aplicados via foliar. O experimento foi conduzido em delineamento de blocos casualizados com três repetições. As aplicações foliares iniciaram a partir do início do florescimento das plantas (21 de dezembro de 2013), com aplicações quinzenais até 01 de março de 2014. Foram avaliadas as características de trocas gasosas: rendimento fotossintético, concentração interna de CO2 e taxa de transpiração; e as agronômicas: número e produtividade de frutos não comerciais e comerciais; e a massa média, volume e firmeza de frutos comerciais. A aplicação foliar de boro a partir do início do florescimento aumentou a fotossíntese e a produção de frutos comercializáveis de pimentão cultivado a campo. Não houve efeitos benéficos da aplicação foliar de cálcio e de Stimulate sobre as trocas gasosas e a produção de frutos de pimentão. Os efeitos mais consistentes do boro foram no aumento do número de frutos comerciais. A pulverização foliar com cálcio a partir do início do florescimento aumentou a firmeza dos frutos comerciais de pimentão.
ISSN:0102-0536
1806-9991
DOI:10.1590/s0102-053620180412