c7d03397_ening_Tips_and_Plants___How_to__Plant_Uses
[Plant Symptoms] Leaves are thin and brittle; purplish red or brown to bronze; striped or yellow to brown between veins; curl upward; or don't grow long Plants mature late and don't thrive [Deficiency] Magnesium [Sources] Kelp or fish extract, mulch dolomitic limestone, compost [Plant Uses] 
Chlorophyll; aids in carbohydrate metabolism, energy use, and genetic material manufacture
Organic Gardening Tips and Plants - How to