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|What's Wrong with your Plants?|
The following simplified key should help you diagnose nutritional problems. This key is based on the fact that some elements easily move from one leaf to another inside the plant, while others are immobile and some are intermediate.|
* If an element is mobile (nitrogen, phosphorus, potassium, sodium, magnesium, chlorine, sulfur), symptoms of its deficiency will be seen first in older lower leafs, because it will be shifted up into newer growth where it is most needed.
* If an element is immobile in the plant, symptoms of its deficiency will be seen first in the younger leaves because it cannot be drawn to where it is needed. Immobile elements include iron, calcium and boron.
* In Marijuana, old leaves have a natural tendency to turn yellow, dry up and wither away. This does not automatically mean the plants short on nitrogen. However, if the whole plant takes on a light-green to yellowish color that is most pronounced in its oldest leaves, it probably has a nitrogen deficiency.
* If the older leaves turn dark green and red or purple colors are seen in the veins, suspect a phosphorus deficiency
* If you see older leaves becoming mottled, turning yellow and curling their leaf edges upward, consider a magnesium shortage
* If older leaves are mottled, yellowing and have necrotic spots at the tips and between the veins, a lack of potassium is probably the problem
* If the dead spots are generalized over the plant and rapidly enlarging and the stalks have shortened internodes the plant could need zinc.
* If you see distortions at the tips or base of the upper, younger leaves, followed by terminal bud shriveling up, the plant has a calcium deficiency.
* If young leaves of the terminal bud turn bright green at the base and become twisted, suspect a boron deficiency. If the terminal bud turns warty and dies, you have too much boron.
* If younger leaves wilt permanently without spotting or yellowing, the problem could be a copper deficiency.
* If young leaves don't wilt but turn yellow and show spots of dead tissue scattered over the leaf, the plant needs more manganese.
* If young leaves are light green and do not show dead spots, chances are the plant is short of sulfur.
* If young leaves start turning yellow and there are no dead spots present, a deficiency of iron should be suspected.
Too Hot; Too Dry; Too Much Water
PLANT GROWING SLOWLY
Too Much Water; Too Cold; Not Enough Fertilizer
BROWN LEAF MARGINS
Air Too Hot and Dry; Too Much Water; Too Much Fertilizer
SPOTS ON LEAVES
Spider Mites or Other Pests; Too Much Fertilizer
PALE, SPINDLY GROWTH
Not Enough Light; Not Enough Fertilizer; Too Hot; Too Much Water or High Humidity
YELLOW LEAVES THAT FALL
Not Enough Humidity; Too Much Water; Air Too Cold; Not Enough Fertilizer
YELLOW LEAVES STAY ON
PH Problem; Water Hard (Well Water)
Mold or Fungus; Too Much Water; Too Much Humidity
SUDDEN DROPPING OF LEAVES OR BUDS
Too Much Water; Air Too Dry; Air Too Cold; Transplant Shock (Not Enough Water or Temperature Extremes)
This article was copied by Rodge 420 from HIGHTIMES magazine 9/95 volume #253 & 12/94 volume #232 and is published in the book " The Best of Sinsemilla Tips"
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