KieserBor is an ingredient of kieserate + fertibor capable of treating leaf yellowing and boron works for pollen production between female and male flowers.  Balancing photosynthesis to restore crop yields. With mgo 23% plus potassium 1.8% enriched with boron 4.5% and sulfur 18% Your tree will be able to rebalance the crop yield.

Contains fully water-soluble Mg & K, Slow Release B and Non-Acidifying S 23%MgO + 1.8%K2O + 4.5%B2O5 + 18%S