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Diagnose Sick Cannabis Plants | Marijuana Nutrient Problems & Symptoms by Picture
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<blockquote data-quote="L0oD" data-source="post: 418086" data-attributes="member: 42867"><p>Calcium Deficiency</p><p></p><p>[ATTACH=full]54067[/ATTACH]</p><p>Problem: Calcium is an important nutrient which helps provide structure to the cannabis</p><p>plant and helps it withstand stress like from heat.</p><p>A cannabis calcium deficiency can sometimes be difficult to diagnose since calcium deficiencies are often accompanied by magnesium, iron, and/or other cannabis deficiencies.Calcium moves relatively slowly through the plant (it is a semi-mobile nutrient), which means it tends to "stay put" after it's been given to a leaf.</p><p>Because of this, calcium deficiencies tend to show up in newer growth (upper leaves) and middle vegetative growth.</p><p>[ATTACH=full]54068[/ATTACH]</p><p></p><p>Calcium Deficiencies Appear on Relatively New Leaves</p><p></p><p>Calcium deficiencies tend to appear on newer or growing leaves,</p><p>which means calcium deficiencies first appear on leaves where there's rapid vegetative growth.Some of the most noticeable signs of a calcium deficiency will appear on newer or growing leaves which may display:</p><p></p><p>Dead spots</p><p>Crinkling</p><p>Spotting / Mottling</p><p>Small brown spots</p><p>Stunted growth</p><p>Small or distorted new leaves</p><p>Curled tips</p><p>Leaf die-off</p><p>Affected leaves may appear dark green besides the spots</p><p></p><p>Here's a close-up of a calcium deficiency that appeared on leaves towards the top of a cannabis plant grown in coco coir:</p><p>[ATTACH=full]54069[/ATTACH]</p><p>Other Symptoms of Calcium Cannabis Deficiency</p><p></p><p>If a cannabis plant is affected by a calcium deficiency for too long,</p><p>it may begin to show the following symptoms due to the lack of calcium.</p><p></p><p>Stems become weak or flimsy and may crack easily</p><p>Stems become hollow or show inner signs of decay</p><p>Plant does not stand up well to heat</p><p>Flowers/buds do not develop fully, or development is slow</p><p>Roots appear weak or under-developed</p><p>In severe calcium deficiencies, parts of roots may even die off or turn brown. Roots are more susceptible to root problems like slimy root rot</p><p>Cannabis tends to like high levels of calcium, so it is unusual to feed too much calcium when using normal amounts of nutrients and/or regular soil. There are not many known cases of cannabis calcium toxicity (too much calcium),however too much calcium can cause the plant to lock out other nutrients, so it's important not to go overboard..</p><p></p><p>Calcium deficiencies are more likely to appear when...</p><p></p><p>Grower is using filtered or reverse osmisis (RO) water to feed plants - the amount of calcium found in tap water varies, but some tap water has enough calcium to prevent calcium deficiencies.Growing cannabis in hydroponics with nutrients that don't supplement</p><p>calcium or when growing in water that has less than 6.2 pH</p><p>Growing cannabis in coco coir that hasn't been supplemented with calcium or below 6.2 pH</p><p>When growing in soil or soilless growing medium that hasn't been supplemented with calcium (usually from dolomite lime) or is acidic (below 6.2 pH)</p><p>Too much potassium can also sometimes cause the appearance of a calcium deficiency</p><p>Outdoors - calcium deficiency is more likely to appear in acidic soil (below 6.2 pH)</p><p>[ATTACH=full]54070[/ATTACH]</p><p>Different strains of cannabis tend to have different nutrient problems.</p><p>Some cannabis strains (or even specific plants) tend to use much higher levels of calcium than others, and so you may see calcium deficiency problems with one plant even when all the other plants (which are getting the same nutrients and environment) aren't showing any signs of deficiency.</p><p>Solution For Calcium Deficiency in Cannabis</p><p></p><p>Your cannabis plant may show signs of a calcium deficiency if the pH at the roots is too high or too low. That is because when the pH of your root zone is off,your cannabis cannot properly absorb calcium through its roots. Therefore the first step is to ensure that you have the correct pH for your growth medium.</p><p>Please note: After a calcium deficiency is cleared up, the problem</p><p>(brown spots and unhealthy new leaves) will stop appearing on new growth,usually within a week. Please note that leaves which have been damaged by a calcium deficiency will probably not recover or turn green, so you want to pay attention to new growth for signs of recovery.</p><p></p><p>In soil, calcium is best absorbed by the roots in the 6.2 - 7.0 pH range</p><p>(in soil, it's generally recommended to keep the pH between 6.0 - 7.0,</p><p>but calcium specifically tends to be best absorbed above 6.2)</p><p>In hydro, calcium is best absorbed by the roots in the 6.2 - 6.5 pH range</p><p>(in hydro, it's generally recommended to keep the pH between 5.5 - 6.5,</p><p>but calcium specifically tends to be best absorbed above 6.2)</p><p></p><p>If you suspect your growing cannabis plant has a calcium deficiency, flush your system with clean, pH'd water that contains a regular dose of cannabis-friendly nutrients that includes calcium. This will remove any nutrient salts that may be affected the uptake of calcium and help restore pH to the proper levels..</p><p>To supplement with extra Calcium... (it's very rare to give a cannabis plant too much calcium, however, too much calcium can lock out other nutrients so don't go overboard)</p><p>Calcium, magnesium, and iron deficiencies often appear together in cannabis.Many growers decide to purchase some sort of Calcium-Magnesium (often called Cal-Mag) supplement for their grow room in case this common deficiency appears. After supplementing with Cal-Mag and correcting the pH,you should expect to see new healthy growth within a week. Remember,the old leaves will probably not recover, but new growth should be green and healthy.</p></blockquote><p></p>
[QUOTE="L0oD, post: 418086, member: 42867"] Calcium Deficiency [ATTACH=full]54067[/ATTACH] Problem: Calcium is an important nutrient which helps provide structure to the cannabis plant and helps it withstand stress like from heat. A cannabis calcium deficiency can sometimes be difficult to diagnose since calcium deficiencies are often accompanied by magnesium, iron, and/or other cannabis deficiencies.Calcium moves relatively slowly through the plant (it is a semi-mobile nutrient), which means it tends to "stay put" after it's been given to a leaf. Because of this, calcium deficiencies tend to show up in newer growth (upper leaves) and middle vegetative growth. [ATTACH=full]54068[/ATTACH] Calcium Deficiencies Appear on Relatively New Leaves Calcium deficiencies tend to appear on newer or growing leaves, which means calcium deficiencies first appear on leaves where there's rapid vegetative growth.Some of the most noticeable signs of a calcium deficiency will appear on newer or growing leaves which may display: Dead spots Crinkling Spotting / Mottling Small brown spots Stunted growth Small or distorted new leaves Curled tips Leaf die-off Affected leaves may appear dark green besides the spots Here's a close-up of a calcium deficiency that appeared on leaves towards the top of a cannabis plant grown in coco coir: [ATTACH=full]54069[/ATTACH] Other Symptoms of Calcium Cannabis Deficiency If a cannabis plant is affected by a calcium deficiency for too long, it may begin to show the following symptoms due to the lack of calcium. Stems become weak or flimsy and may crack easily Stems become hollow or show inner signs of decay Plant does not stand up well to heat Flowers/buds do not develop fully, or development is slow Roots appear weak or under-developed In severe calcium deficiencies, parts of roots may even die off or turn brown. Roots are more susceptible to root problems like slimy root rot Cannabis tends to like high levels of calcium, so it is unusual to feed too much calcium when using normal amounts of nutrients and/or regular soil. There are not many known cases of cannabis calcium toxicity (too much calcium),however too much calcium can cause the plant to lock out other nutrients, so it's important not to go overboard.. Calcium deficiencies are more likely to appear when... Grower is using filtered or reverse osmisis (RO) water to feed plants - the amount of calcium found in tap water varies, but some tap water has enough calcium to prevent calcium deficiencies.Growing cannabis in hydroponics with nutrients that don't supplement calcium or when growing in water that has less than 6.2 pH Growing cannabis in coco coir that hasn't been supplemented with calcium or below 6.2 pH When growing in soil or soilless growing medium that hasn't been supplemented with calcium (usually from dolomite lime) or is acidic (below 6.2 pH) Too much potassium can also sometimes cause the appearance of a calcium deficiency Outdoors - calcium deficiency is more likely to appear in acidic soil (below 6.2 pH) [ATTACH=full]54070[/ATTACH] Different strains of cannabis tend to have different nutrient problems. Some cannabis strains (or even specific plants) tend to use much higher levels of calcium than others, and so you may see calcium deficiency problems with one plant even when all the other plants (which are getting the same nutrients and environment) aren't showing any signs of deficiency. Solution For Calcium Deficiency in Cannabis Your cannabis plant may show signs of a calcium deficiency if the pH at the roots is too high or too low. That is because when the pH of your root zone is off,your cannabis cannot properly absorb calcium through its roots. Therefore the first step is to ensure that you have the correct pH for your growth medium. Please note: After a calcium deficiency is cleared up, the problem (brown spots and unhealthy new leaves) will stop appearing on new growth,usually within a week. Please note that leaves which have been damaged by a calcium deficiency will probably not recover or turn green, so you want to pay attention to new growth for signs of recovery. In soil, calcium is best absorbed by the roots in the 6.2 - 7.0 pH range (in soil, it's generally recommended to keep the pH between 6.0 - 7.0, but calcium specifically tends to be best absorbed above 6.2) In hydro, calcium is best absorbed by the roots in the 6.2 - 6.5 pH range (in hydro, it's generally recommended to keep the pH between 5.5 - 6.5, but calcium specifically tends to be best absorbed above 6.2) If you suspect your growing cannabis plant has a calcium deficiency, flush your system with clean, pH'd water that contains a regular dose of cannabis-friendly nutrients that includes calcium. This will remove any nutrient salts that may be affected the uptake of calcium and help restore pH to the proper levels.. To supplement with extra Calcium... (it's very rare to give a cannabis plant too much calcium, however, too much calcium can lock out other nutrients so don't go overboard) Calcium, magnesium, and iron deficiencies often appear together in cannabis.Many growers decide to purchase some sort of Calcium-Magnesium (often called Cal-Mag) supplement for their grow room in case this common deficiency appears. After supplementing with Cal-Mag and correcting the pH,you should expect to see new healthy growth within a week. Remember,the old leaves will probably not recover, but new growth should be green and healthy. [/QUOTE]
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