Application of 2,4-D hormetic dose associated with the supply of nitrogen and nickel on cotton plants

• Published in: Journal of environmental science and health. Part B, Pesticides, food contaminants, and agricultural wastes Pesticides, food contaminants, and agricultural wastes, 2021, Vol.56 (9), p.852-859
• Main Authors: Aguilar, Jailson Vieira, Lapaz, Allan de Marcos, Sanches, Carlos Vinícius, Yoshida, Camila Hatsu Pereira, Camargos, Liliane Santos de, Furlani-Júnior, Enes
• Format: Article
• Language: English
• Subjects: 2,4-D; Amino acids; Ammonia; Auxins; Cotton; Coverage; Crop yield; Fertilization; Flowering; Fruits; Gossypium hirsutum L; Growth stage; hormonal herbicide; Nickel; Nitrogen; Photosynthesis; Photosynthetic pigments; Pigments; Synthetic auxin
• ISSN: 0360-1234; 1532-4109
• DOI: 10.1080/03601234.2021.1966280

Growth traits, yield, N content, photosynthetic pigments, ammonia and amino acids were measured to verify the effect of the interaction between N, Ni, and 2,4-D applied in the cotton crop. The objective was to study the hormonal effect of 2,4-D associated with the application of N and Ni in coverage to improve yield. The N (0, 40, 80, and 120 kg ha −1 ) and Ni(0, 300, 450, and 600 g ha −1 ) were applied to the soil in the square phenological growth stage. The commercial 2,4-D DMA® BR (0 and 1.8 g a.e ha −1 ) was applied to the leaves at the same growth stage. The supply of N in cover fertilization up to 120 kg ha −1 was beneficial for cotton, providing greater yield and content of photosynthetic pigments. The application of 2,4-D in a hormetic dose, as a synthetic auxin during the beginning of flowering, proved to be a promising technique to improve cotton yield. This end-of-cycle response is related to the requirement for auxins during the cotton fruiting process.