Title:	Gas exchange and productivity responses of Panicum maximum cultivars to increasing soil potassium levels in a greenhouse study.
Authors:	VÉRAS, E. L. de L. DIFANTE, G. dos S. ARAUJO, A. R. de MACEDO, M. C. M. MONTAGNER, D. B. EUCLIDES, V. P. B. RODRIGUES, J. G. SANTANA, J. C. S. MONTEIRO, G. O. de A. PEREIRA, M. de G. TEODORO, P. E. GURGEL, A. L. C.
Affiliation:	EMMANUEL LIEVIO DE LIMA VÉRAS, UNIVERSIDADE FEDERAL DE MATO GROSSO DO SUL; GELSON DOS SANTOS DIFANTE, UNIVERSIDADE FEDERAL DE MATO GROSSO DO SUL; ALEXANDRE ROMEIRO DE ARAUJO, CNPGC; MANUEL CLAUDIO MOTTA MACEDO, CNPGC; DENISE BAPTAGLIN MONTAGNER, CNPGC; VALERIA PACHECO BATISTA EUCLIDES, CNPGC; JÉSSICA GOMES RODRIGUES, UNIVERSIDADE FEDERAL DE MATO GROSSO DO SUL; JULIANA CAROLINE SANTOS SANTANA, UNIVERSIDADE FEDERAL DO RIO GRANDE DO NORTE; GABRIELA OLIVEIRA DE AQUINO MONTEIRO, UNIVERSIDADE FEDERAL DE MATO GROSSO DO SUL; MARISLAYNE DE GUSMÃO PEREIRA, UNIVERSIDADE FEDERAL DE MATO GROSSO DO SUL; PAULO EDUARDO TEODORO, UNIVERSIDADE FEDERAL DE MATO GROSSO DO SUL; ANTONIO LEANDRO CHAVES GURGEL, UNIVERSIDADE FEDERAL DO PIAUÍ.
Date Issued:	2025
Citation:	Scientific Reports, v. 15, 40704, 2025.
Description:	Potassium (K) is essential for the productivity of tropical grasses, but its optimal supply remains unclear. This study evaluated the effects of K on gas exchange, photosynthetic rate (A), forage production (FP), and root development (RP) in Panicum maximum cultivars. The experiment was conducted using a randomized block design in a 6×4 factorial scheme (six cultivars: Tanzânia, Quênia, Mombaça, Zuri, Massai and Tamani; and four K rates: 0, 205, 410 and 820 mg dm−3). There was interaction between cultivars and K rates for A and stomatal conductance (gs ), with linear increases in A for all cultivars. The gs response in the Zuri cultivar was quadratic, with a maximum of 5.32 mmol m−2 s−1 at the dose of 410 mg dm−3 K, and linear for the other cultivars. The CO2 concentration (Ci) and leaf temperature (Tleaf) were not influenced by the K dose or by the cultivars, maintaining an average of 129.28 ppm and 29.32 °C, respectively. Transpiration (E) increased by 0.018 mmol m−2 s−1 with increasing K doses. The chlorophyll content fitted a quadratic model, with a maximum of 35 SPAD at the dose of 530 mg dm−3. The FP increased linearly for all cultivars, with the highest FP in the cultivars Quênia, Mombaça and Zuri. Increasing K doses improved A and gs , reflecting in higher FP. The cultivars Quênia and Mombaça showed the greatest increases in FP up to 820 mg dm−3 K, while the maximum efficiency for RP occurred between 205 and 410 mg dm−3, suggesting that excessive K supply may not proportionally increase root development
Thesagro:	Panicum Maximum Pastagem Potássio
NAL Thesaurus:	Gas exchange Forage grasses Greenhouses Potassium Tropical pastures
DOI:	https://doi.org/10.1038/s41598-025-24330-y
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CNPGC)