الاسمدة / انواعها/مواصفاتها/اختباراتها/مراقبة جودتها
Apr 09, 2011· Definitions Many prefixes such as mineral, inorganic, or chemical are often used to describe fertilizers and these are used interchangeably. Fertilizer grade is an expression referring to the legal guarantee of the available plant nutrients expressed as a percentage by weight in a fertilizer, a 123216 grade of NPK complex fertilizer indicates the presence of 12 % .