Effects of foliar application of chemical agents and shading levels on growth and physiological aspects of "malagueta" pepper plants

Abstract

Foliar application of chemical agents and cultivation in different levels of shading can modify pepper plants. The objective of this study was to evaluate the effect of the application of chemical agents in the growth, partition of photoassimilates and photosynthetic pigments of malagueta pepper in different growing environments. The treatments were arranged in a randomized design with a 2x5 factorial scheme under two cultivation environments [eucalyptus structures measuring 5.0 x 5.0 x 2.5 m (length x width x height), coated with type coverage screens (Sombrite®) with 18% and 35% shading], and five treatments with chemical agents [1 - C - without application; 2 - PBZ (50 mg L-1) + Nut. (1%); 3 - Gib. (50 mg L-1) + Nut. (1%); 4 - Amin. (50 mg L-1) + Ant. (50 mg L-1) and 5 - Gib. (50 mg L-1) + A (50 mg L-1) + Amin. (50 mg L-1) + Ant. (50 mg L-1)] in four replications. We evaluated the stem diameter, the plant height, number of leaves, leaf dimensions, leaf area, accumulation and dry matter partition and chlorophyll contents. The cultivation of pepper plants in environment with 18% of shading provides plants with a higher number of leaves and dry matter, as environment protects plants against climatic agents by controlling temperature, humidity and solar radiation. The application of the Paclobutrazol + Nitrogen promotes shoot growth and increases the green pigmentation in pepper plants.

Ambientes protegidos para produção vegetal no Brasil - Ambiência vegetal nas condições brasileiras

“…A aplicação do Paclobutrazol + Nitrogen promove o crescimento da parte aérea e aumenta a pigmentação verde em plantas de pimenta. Ascoli et al (2020), https:// www.cropj.com/ascoli_14_2_2020_229_235. pdf, https://www.cropj.com/february2020.…”

Priming and Growth Inhibitor in the Production of High-Quality Pepper Seedlings

“…Some growth inhibitors, such as paclobutrazol (PBZ), act inhibiting gibberellin production, a hormone responsible for vegetative growth and used to avoid etiolation, lodging, or even the competition between plants (Brito et al, 2016;Pacentchuk et al, 2018). These substances can be used directly in the soil/substrate in the treatment of seeds or sprayed on the leaf surface (Benett et al, 2014;Parladore et al, 2019;Ascoli et al, 2020;Matos et al, 2020). Plants with a lower shoot height, but with a well-developed root system, an important characteristic for plant survival in the face of water stress, can be obtained depending on how it is applied (Wanderley et al, 2014.…”