Drooping leafs, each one dying out going YELLOW....

hey there, im gonna try and copy/paste this... all about nute defeciencies. i dont think that yellowing is caused from light, or lumens...

Cannabis needs the correct combination of macro and micronutrients to live, grow and bloom properly. When plants are under or overfed, they will show symptoms of being unhealthy. Cannabis nutrients fall into 2 categories: macronutrients and micronutrients. Macro-nutrients are the elements that cannabis needs in large amounts. They are: nitrogen, phosphorus, potassium, calcium, magnesium and sulfur. Micronutrients are the elements that cannabis needs in small amounts (sometimes called trace elements). They are iron, manganese, copper, zinc, molybdenum, cobalt, boron and chlorine. Of all the micronutrient deficiencies in cannabis we will first see iron, manganese and zinc, most common in flowering and in vegetative growth. Though these elements are only needed in small amounts, they are very critical to the uptake of macronutrients.

For instance, research in cannabis nutrient uptake has found that the right combination of iron and sulfur uptake is very important for optimal nitrogen uptake. This is just one area of micronutrients to macronutrient research uptake.

There are many more combination of micronutrients to macronutrients that are critical to each other. This is why it is important to diagnose deficiencies or toxicities as early as possible. If one micro or macronutrient is not in its proper proportion, it can have a negative cascading effect on the rest of the plant’s nutrient uptake.

When you see something is wrong on your plant, where on the plant is also very crucial to narrowing down what the deficiency is. Macro and micronutrients fall into two other categories, mobile and immobile. Mobile nutrient deficiencies will show up in older growth first. Immobile nutrient deficiencies will show up in new growth first. Mobile cannabis elements are nitrogen, phosphorus, potassium, molybdenum, magnesium and zinc. Immobile cannabis elements are iron, copper, manganese, chlorine, cobalt, boron, calcium, and sulfur, however, sulfur deficiency is kind of tricky to identify, but most of the time will show up on older growth first. Sulfur is a semi-mobile element.

Once you figure out your plant’s specific deficiencies, you should ask yourself why this occurred.

If you do have a deficiency and you are using a good quality hydroponic solution, most likely your problems are with your pH being too low or too high. Cannabis will grow in a pH range of 5 to 7, however this is far from ideal at the low and high end of that particular pH range. Your pH for sphagnum moss mixes and soils should be pH 6.2 - 6.5, with 6.3 being ideal. For hydroponic growing mediums, a pH 5.5 - 5.8, with 5.6 being ideal. Also, your nutrient strength (ppm or EC) may be too low or too high. If you are just starting out or an intermediate grower, a range of 1,000-1,400 ppm is ideal. If you are a master grower, you can drive your plants hard with CO2 and proper environmental conditions, and a nutrient solution of 1,800 ppm or more. You absolutely must know your cannabis strain and keep a very careful eye on your plants. Also, you should drain and change your nutrient reservoir every week. Do not wait 2-3 weeks to change your nutrient solution, because as your plants use up some elements, they are not using others. Eventually there will be an abundance or deficiency of one or more elements, causing nutrient lock-up or starting the domino effect of multiple plant toxicities or deficiencies. By avoiding some of these common mistakes and identifying nutrient deficiencies early on, you will be well on your way to a bountiful and healthy crop.


HIGH All, this is from MynameStitch who has done a lot of research on sick plants.

Calcium (Ca) -Macro Nutrient and an Immobile element.

Calcium is another important element that helps the plants cell walls, cell division in making the plants stems, stalks, branches stronger, as well as contributing to root growth, mostly the newer root hairs, Calcium also helps enhancing the uptake of K in the the plants roots. Calcium moves really slow within the plant and tends to concentrate in roots and older growth.

When plants exhibit a Calcium deficiency the younger leaves are the first to show it as well as older leaves. The Leaf tips will die back, the tips may curl, and growth of the plant is stunted. The plant can show a weakness in the stems and branches, as well as a under developed root system that can lead to bacteria problems with roots dieing off. Having slow plant transpiration rates can aggravate the uptake of calcium. Make sure your soil isn’t very acidic, for calcium gets harder to be absorbed through acidic soils, Which leads to having a plant that is deficient in Calcium. The leaf tips, edges and new growth will or may turn a yellow/brown color that happen in spots and often surrounded by a sharp brown outlined edge and then the leaf tips die back. If too much calcium is given at an early stage of growth it can stunt the growth of your plants. Having to much of calcium will also flocculate when a concentrated form is combined with potassium. The parts affected by a calcium deficiency are the roots. Stem or petiole, young or old leaves.

Too much Calcium will lead to other micronutrient deficiencies. Calcium fixation is caused by many types of mediums such as: clay soils, unbuffered coco and humus. The lime tends to bond to these soils very easily. The stems of the plant will not be able to hold the plant up and will exhibit a white brown in between the veins of the leaves when having too much calcium. Also having to much potassium and or nitrogen will cause a calcium lockout.

Problems with Calcium being locked out by PH troubles

Improper watering, (most common cause), very acidic soils with excessive potassium, excessively dry and or wet soil. Lack of calcium in the soil results in the soil becoming too acid. This leads to Mg or Fe deficiency or very slow stunted growth

Soil

Calcium gets locked out of soil growing at ph levels of 2.0- 6.4 Calcium is absorbed best in soil at a ph level of 6.5-9.1 (Wouldn’t recommend having a ph of over 7.0 in soil) anything out of the ranges listed will contribute to a Calcium Deficiency.

Hydro and Soil less Mediums

Calcium gets locked out of Hydro and Soil less Mediums at ph levels of 2.0- 5.3 Calcium is absorbed best in Hydro and Soil less Mediums at ph levels of 5.4-5.8 (Wouldn’t recommend having a ph over 6.5 in hydro and soil less mediums.) Best range for hydro and soil less mediums is 5.0 to 6.0. Anything out of the ranges listed will contribute to a Calcium Deficiency.

Solution to fixing a Calcium deficiency To fix a calcium deficiency you can treat by foliar feeding with one teaspoon of dolomite lime or Garden lime per quart of water, Or Any Chemical/Organic nutrients that have Calcium in them will fix a Calcium deficiency. (Only mixing at ½ strength when using chemical nutrients or it will cause nutrient burn!) Or you can take crushed up dolomite lime or garden lime in a gallon of water and water it in the soil. 1 to 2 teaspoons per gallon of water, which will be slow acting. Garden Gypsum, which is medium absorption. Limestone, which is medium absorption, Rock Phosphate and Animal wastes which are both medium/slow absorption. Note: Caution when using gypsum to an already acid soil (pH that is less than 5.5) can have a very bad effect on different types of plants by effecting the absorption of soil aluminum, which is poison to plant roots.

Now if you added to much chemical nutrients and or organics, (which is hard to burn your plants when using organics) you need to flush the soil with plain water. You need to use 2 times as much water as the size of the pot, for example: If you have a 5 gallon pot and need to flush it, you need to use 10 gallons of water to rinse out the soil good enough to get rid of excessive nutrients.

Edit: for your root slim problem....me I use SM90...as you might have noticed I'm a user of Nutrilife's products like the "A" "B" "C" Powder and SM90

 

^ that whole post is nice and all, but I'm pretty sure the problem is just the lower leaves aren't getting enough light. your light is only 35 watts, not 150. the 150 thing is just a marketing ploy. you have to go by the real wattage... not what they say it equals to in incadescents. most likely the upper leaves are blocking the light to the lower leaves and they are dying off because they aren't getting enough light... you really should get some more light.


edit: oh and p.s. - where the hell do you live in the US where it is STILL getting to 30?! alaska...? it's like 90+ here every day and it's still two months away from the hottest part of the year. :[

 

are you using any nutes? If the plant has been growing for a while it could have used up all the nitrogen in the soil. When that happends the plant will draw nitrogen out of the lower level leaves to support the tops causing yellowing of lower leaves. Just a thought for you.. If you have used fertilizer with good n any time soon this should not be the problem. I just reread... the superthrive is just a vitamin/hormone tonic, but the tetra whatever is a nute, but not the best if it's the same premixed stuff my wal-mart sells which i think it is. I'd get some pure blend pro, or maxi grow. These are cheaper 2 part solutions grow/bloom, and work great for the newer grower. The pure blend pro being my first choice as it is a liquid solution.

I start vegging my plants under 35-42 watt cfls. cfls in this range of wattage throw about 1700, 2200 lumens per bulb, but must be literally an inch or two away from the tops of the plants. For small plants they work fine, but once they reach 10-12 inches they don't hit those lower leaves with as much light. It may be time for some more lighting.. place one shining in from the side, and keep them close.

 

My plant is in flowering cycle week two and the top Leaves are turning yellow sorta looks like burned patches at the base of the stem I really need help this is my first grow the stems are drying up and the leaves are toppling over I suspected over watering or the fertilizer in the soil is killing it because within fifteen minutes of watering it went from beautiful and green to the leaves slumping completely over and dying on top. The leaves on bottom and are perfectly fine I don't need a link I've tried to read about it I just need a diagnosis and cure please help asap

 

I just had a similur problem..my plants are about a month old & i have a soiless mix cooking for about 3 weeks now, for the time being i have my plants in 4 inch peatpot with promix hp & a liitle ewc just till my mix is ready..the last 2 weeks the botton leaves were turning yellow & starting to get higher up the plant & the rest of the plant was light green. i thought it was magneseuim so i added 1 teaspoon of epsom salt to a gallon of water, still no better..so i gave it a strong feeding of high nitrogen(full strength of grow big & half big bloom together) & 2 days later they got there dark green color back. the bottom yellow leaves just died but the rest of the plant is beautyiful again. Give them a good feeding of anything high in N for the N.P.K. Cuz u said ur feeding super thrive, its just a vitamin
Hope everything works out for you
i just noticed that this is an old thread..lol