Feeding the world: : the future role for minerals

• Autores: Industrial Minerals
• Localización: Industrial Minerals, ISSN 0019-8544, Nº. 570, 2015 (Ejemplar dedicado a: Marzo)
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • Other factors contributing to low soil pH are acid rain and 'nitrification', the break down of ammonium (NH[superscript]4 [superscript]+ )[superscript] from fertiliser to nitrate (NO[superscript]3 [superscript]- ) and H [superscript]+.

    The Association of American Plant Food Control defines slow release fertiliser as "containing a plant nutrient in a form which delays its availability for plant uptake after application, or which extends its availability to the plant significantly longer than a reference 'rapidly available nutrient fertiliser' such as ammonium nitrate, ammonium phosphate or potassium chloride".

    In contrast to other clay minerals, zeolites have a rigid three dimensional (3D) crystal structure similar to a honeycomb, consisting of interconnected channels and cages. Water molecules and potassium and calcium cations are contained within the crystal. Zeolite has a high cation exchange capacity but only for those of the correct size to fit into the pores, hence the description 'molecular sieve'.