Wholesale organic granular fertilizerselect 2020 high quality wholesale organic granular fertilizer products in best price from certified chinese agricultural organic fertilizer manufacturers, organic soil fertilizer suppliers, wholesalers and factory on made-in-china Fertibor boron, mined and purified boron, should be used in very small amounts (2-10 lb/acre) because it can become toxic to plants if over-applied. fertibor is a slow release, 15% boron for soil application. highly soluble; to calculate them amount of fertibor required, multiply the elemental boron required by 6.6 (based on a soil test) Organic fertilizerswholesale supplier. custom blends of organic & mineral available--granular--pro gro, 5-3-4omriproduct label (pdf) ... boron is one of seven essential micronutrients vital to fertilization, fruit and seed production & is the most widespread of all crop deficiencies, affecting almost all crops. ... Rbchem organic fertilizer boron granular , boron humate granule_okchem. products. products; suppliers; hot search. isononanoic acid copper oxide titanium dioxide hemp seed oil vitamin e fumed silica antifoam defoamers silane coupling agent sodium citrate citric acid monohydrate citric acid anhydrous citric acid. post buying request.