If symptoms appear on new leaves, the problems could related to iron, zinc, manganese, copper, boron, calcium, or sulfur.
Deficiency: the first sign will be pale new leaves. growth will be stunted. leaves can be brittle and narrow-er then normal. you can get mutated leaves becuase of this. in flowering, buds will die off! NOT COOL. stems will become hard and thin. this is commonly confused with nitrogen deficiency, but NO, the yellowing starts at the center of leaf, and works its way outward. (pic 1), then 2nd pic shows mutations caused by S def.
Those most common sign of a sulfur deficiency is noticeable yellowing on the new growth of the plant.
Plants suffering from S definciencies exhibit yellowing of new growth.
Mix one tablespoon of Epsom salts per gallon of water until condition
Picture 1: shows a sulfur deficiency, notice how at the top part the yellow is starting from the backside of the leaf towards the front.....
Picture 2: A young seedling suffering from a Sulfur deficiency.
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Type: secondary macronutrient
A structural component of amino acids, proteins, vitamins and enzymes and is essential to produce chlorophyll. It imparts flavor to many vegetables. It is an important part of plant vitamins, such as biotin and thiamine, which are necessary for normal respiration and metabolism. (Plants synthesise all vitamins they need.) Some water supplies may contain Sulfur.
Deficiency symptom: Uniform chlorosis first appearing on new leaves. Sulfur is needed for formation of chloroplasts (not part of chlorophyll molecule). After the plant is deficient for a long time it may be difficult to tell S deficiency from N deficiency.
Sulfate/sulfur toxicity symptoms begin as an interveinal chlorosis and scorching of the leaf margins, which gradually proceeds inward.
Excess sulfate-S (SO4--) can reduce the uptake of some anions such as nitrates (NO3-) and the available form of molybdenum (MoO4-). Excessive amounts of nitrates can also reduce the uptake of sulfate-S.
Picture 4 & 5: Plants in vegetation suffering from a Sulfur deficiency.