Greetings, Netters, and Best Wishes for a Healthy New Year.  I am mystified by a problem with seedlings of Bauhinia species, probably B. monandra, growing in small pots. The seedlings are a little over a month old, and were doing fine until about a week or two ago, when the young leaves began to look chlorotic.  The symptoms are getting worse.  They are growing in a mixture of compost, topsoil, aged chicken manure (mixed with wood shavings), with some wood ashes and a little coral sand.  It looks to me like some sort of deficiency, but I don't think it's nitrogen, since it is on the younger leaves.  I thought of iron, but this red topsoil should have plenty of iron.  I am now beginning to see some necrotic spots on the leaves of a couple of plants, and even veinal necrosis in one plant.  Does anyone have any suggestions? Could it be a calcium deficiency?  Maybe I should add a little lime? ... or maybe it is some sort of toxicity?