c7d03397_ening_Tips_and_Plants___How_to__Plant_Uses
[Plant Symptoms] Leaves at branch tips turn down Stems are hard and brittle [Deficiency] Sulfur [Sources] Manure, Sul-Po-Mag, gypsum, elemental sulfur [Plant Uses] 
Found in amino acids, vitamins and co-enzymes
Organic Gardening Tips and Plants - How to