Development and validation of soil test crop response model for beetroot (Beta vulgaris) grown in ultisols of India - Arulmani, Ramasamy; Sellamuthu, Kuppayevalasu Malayappagounder; Maragatham, Subramaniam; Senthil, Alargarsamy; Thamaraiselvi, Seenapuram Palaniswami; Malathi, Palaniappan; Sridevi, Govindaraja (Frontiers in Plant Science, 2025)