The molecular conformation, but not disaggregation, of humic acid in water solution plays a crucial role in promoting plant development in the natural environment oleh Javier Aranaz, David de Hita, Maite Olaetxea, Oscar Urrutia, Marta Fuentes, Roberto Baigorri, Maria Garnica, Maria Movila, Angel M. Zamarreño, Javier Erro, Enrique Baquero, Gustavo Gonzalez-Gaitano, Jose Ignacio Alvarez, Jose M. Garcia-Mina