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Nutrient I.D list
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Plant nutrient deficiencies - signs:
The News & Observer
Following is an extract from the article at the above site/link:
NITROGEN. A lack of this key element results in, of course, slow plant growth. However, other signs of not enough nitrogen are leaves that turn light green and the tips of new growth becoming yellow. Also, the plants have a spindly look and drop their older leaves.
PHOSPHORUS. The symptoms of a shortage of phosphorus are stunted plant growth and small dark reddish spots on the undersides of the leaves that eventually spread. Also, such afflicted plants usually set fruit late.
POTASSIUM. A deficiency of this nutrient is usually first noticed when lower leaves of plants turn a gray-greenish tint. This discoloration usually works its way up the plant, and the off-green is replaced by a dirty yellow coloring. Naturally, the leaves die. In addition, plant stems become slim and hard, and fruit ripens unevenly. This potassium poop-out problem is usually most prevalent late in the growing season when plants use most of their available supply of this element to develop fruit.
MAGNESIUM. Insufficient magnesium will become apparent on the lower leaves of plants first. Mature leaves will hold their dark green coloring except in the areas between veins, which will become yellow. Eventually, the leaves will turn upward and become brittle. This problem is most common late in the growing season on vegetable plants with developing fruit.
CALCIUM. Leaves that suffer from calcium deficiency are normal in size, but the newer, upper leaves are the first to show signs that something is wrong. These young leaves will turn dark green and may even begin to curl. This green is usually replaced by yellow, which starts on the edges and spreads. While these leaves dry up and fall, the lower leaves of the plants remain relatively normal. Eventually, the whole plant becomes weak and wilts.
Blossom end rot on the fruits of eggplants, peppers and tomatoes is also a sign of this problem.
ZINC. Plants have smaller than normal terminal leaves, and other leaves are pocked with yellow areas that may also include dead tissue spots.
IRON. Young leaves begin to turn yellow between the veins. While the yellowing will spread, the veins, margins and tips of the leaves will remain green.
MANGANESE. Plants become stunted, and leaf tissue will turn off-white or yellowish and die, leaving dead spots on the foliage.
BORON. The new growth of plants die, and buds turn light green and will not form flowers. Also, existing leaves are small and misshapen, and plant stems are unusually short. This problem normally occurs in high alkaline soils.
Uptake of Elements by Vegetables
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