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GrowFAQ :

Are the leaf tips curling down, do they have yellow margins which are turning into dark dead spots

  Added by: Nietzsche  Last edited by: Nietzsche  Viewed: 512 times   Rated by 2 users: 10.00/10

Potassium (K)
Potassium is involved in maintaining the water status of the plant and the
tugor pressure of it’s cells and the opening and closing of the stomata. Potassium is required in the accumulation and translocation of carbohydrates. Lack of potassium will reduce yield and quality.

Potassium deficiency (K).
Older leaves are initially chlorotic but soon develop dark necrotic lesions
(dead tissue). First apparent on the tips and margins of the leaves. Stem and branches may become weak and easily broken, the plant may also stretch. The plant will become susceptible to disease and toxicity. In addition to appearing to look like iron deficiency, the tips of the leaves curl and the edges burn and die.
Potassium – Too much sodium (Na) displaces K, causing a K deficiency. Sources of high salinity are: baking soda (sodium bicarbonate “pH-up”), too much manure, and the use of water-softening filters (which should not be used). If the problem is Na, flush the soil. K can get locked up from too much Ca or ammonium nitrogen, and possibly cold weather.


Figure 13.

Figure 14.

Potassium (K) Toxicity

Usually not absorbed excessively by plants. Excess potassium can aggravate the uptake of magnesium, manganese, zinc and iron and effect the availability of calcium.

  Last modified: 21:35 – Jun 22, 2001  
Quicklink:  http://overgrow.com/growfaq/1028
GrowFAQ © 2000-2004 Overgrow
faq:1028 “Are the leaf tips curling down, do they have yellow margins which are turning into dark dead spots”