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Micronutrients in cannabis are calcium, magnesium, iron, manganese, copper, zinc and boron. Each one of these minerals is essential for your plants for many reasons; photosynthesis, transporting nutrients around the plant and for symbiotic activities – plants can’t photosynthesize without magnesium, but an excess of magnesium can block the potassium needed during the flowering period.
Magnesium shows up as yellow stains on your plants, similar to calcium however the brown edges don’t appear until it’s very advances. It doesn’t tend to have many negative effects and it’s hard to catch in time – the plant sucks the nutrient from the leaves very slowly, so the actual deficiency itself shows up extremely slowly too. It would be fatal for your plants to have this deficiency at the beginning of the flowering period as this is when your plant needs magnesium the most. If it shows up towards the end of the grow then you shouldn’t worry as it’s quite normal. It can be fixed by adding some magnesium to your irrigation water or adding Epson salts to the soil. If you’re using osmosis water, then you’re better off using Epson salts in the soil once they begin flowering to avoid any sort of magnesium deficiencies.
Your plants need all of these minerals in the perfect quantities, which can be hard to achieve but if you can recognize the deficiencies then you can easily correct the issue before it gets bad. Generally, your plants will show symptoms on the all of leaves when they’re lacking micronutrients, from the biggest to the smallest leaves, which is how you can tell that the issue is with micronutrients rather than macronutrients.
This deficiency is easily spotted; it shows up through yellow spots or stains that are brown around the edges, and if you don’t stop it in time, the leaves will dry up and fall off; this will also cause vegetation or flowering to stop too, depending on which phase it’s in. This can happen due to not having enough calcium in the soil, which can easily be solved by adding some calcium into the irrigation water as a micronutrient or through a natural fertilizer like dolomite. You’ll need to catch this deficiency early as when it advances it is easily confused with potassium deficiencies, although potassium stains always appear on the edges of the leaf whereas calcium deficiencies can show up on any part of the leaf.
Boron is fundamentally involved in creating the plant’s cellular walls, so small deficiencies are easily distinguishable in small sprouts that haven’t grown yet. These deficiencies cause brown stains, kind of like burns or rust stains. This tends to happen in grows where too much growth fertilizer has been used, and the excess nitrogen blocks the absorption of boron. It also happens in grows where the substrate has gotten too dry, which makes boron rise to the top in the soil and the roots can’t get to it to absorb it. Plants that get a decent amount of boron and a pH between 5 and 7 should have a decent flowering period, a nice calcium absorption and rhe buds wil get even fatter.
Manganese is present everywhere in your plants and is directly related to nitrogen absorption – a lack of this nutrient will cause your plants to stop absorbing nitrogen which can be devastating for your plants. It also affects the creation of proteins in your plants so the growth period will slow down quite a lot. The plant will begin yellowing all over, and although it might look like it’s losing all of its nutrients it’s just nitrogen. This can make for some horrible flavors in your weed if it happens towards the end of the grow. You’ll notice the plant getting yellow from the edges of the leaves towards the inside, leaving the central vein in the leaf green. You can fix this deficiency by enriching the soil with a fertilizer rich in manganese during the growth period, and a little bit at the beginning of the flowering phase.
Micronutrient deficiencies in cannabis – these sorts of deficiencies aren’t as important as macronutrient deficiencies, but they’re still essential for your plants to be healthy. There are many kinds of micronutrients but some of them are more common than others, and others are rarer in as far as deficiencies but you still need to know how to recognize those deficiencies.
Molybdenum is the substance that fixes nitrogen to the plant, and your plants really don’t need much of it. It tends to be in boosters used at the start of the flowering period which helps stop growth and push the plant into flowering. It’s rare for plants to show deficiencies of this micronutrient, although it can appear in grows where the pH isn’t properly adjusted and the soil is too acidy. If your plants show this deficiency during the flowering period then the leaves will go yellow just like a manganese deficiency, although these leaves will rot and dry up. You can fix it by applying the micronutrient alongside a fertilizer rich in phosphorus which will help it to be absorbed. If you use it during the pre-flowering as a flowering stimulant (that contains molybdenum of course) then you’re guaranteed a successful grow without any nasty surprises.
Micronutrient Deficiencies in Cannabis – learn how to spot signs of micro-nutrient deficiencies and how to treat them accordingly.