Ignasi, igual te interesa experimentar con un tema que tenemos pendiente en I+D. Se trata de producir nuestro propio ácido silícico para aplicación foliar directa. Necesitas una solución de silicato de sodio y ácido acético.
Farmer in South India sprays soluble silicic acid (= SA) on rice. SA enhances is a growth promoter for sustainable agriculture enhancing the rice yield 10 -40%. This revolutionary method is introduced since 2008 on rice. Studies of the University of Karnataka have confirmed the results of this groundbreaking technology introduces by SiLife Ltd, the Netherlands (http://www.silife.nl).
Water glass (Sodium silicate solution) reacts with an acid (acetic acid here) to form silicic acid. Silica gel can be obtained by roasting silicic acid.