Had yellow week5

Nutrients are classified as either immobile or mobile depending on if it can be moved around the plant once it’s been fully absorbed. Mobile nutrients are stored in older leaves and can be moved around the plant wherever it’s needed. Immobile nutrients stay close to where they were originally deposited. Deficiencies & excess of mobile nutrients will appear in older growth and leaves first. Where as, deficiencies & excess of immobile nutrients will appear in new growth first usually at the top of the plant. Once you understand the difference and which nutrients are mobile and immobile, it makes it easier to diagnose & fix deficiencies. Whenever you suspect a deficiency, always check your pH first and ensure that it is in the correct range. If it isn’t within the correct range, it won’t be able to absorb some nutrients. So, you could be treating a deficiency, but if the pH is off, it won’t be able to absorb the nutrient still. If your pH is in the correct range, you can now try to figure out what’s going on. NPK the big 3 (& magnesium) are all mobile nutrients so the plant can take nutrients from old growth and use it for new growth if there is a deficency which means you would see it all over or at bottom first. Since growth is mainly affected up top it tells us it's an immobile nutrient. Manganese, Zinc and Iron can all cause the yellowing Interveinal chlorosis looks alot like Iron if I had to choose id say iron deficency. IRON It is essential for nitrate and sulfate reduction and assimilation. Iron is also a catalyst for the production of chlorophyll. Deficiencies are usually due to excessive amounts of copper, manganese or zinc or improper pH. Early sign of deficiency is yellowing between the veins of the leaves in the base of new leaves. As it progresses, the interveinal yellowing will spread to older leaves as well. MANGANESE A deficiency is rare and usually caused by high pH or an excess in iron. Manganese helps the plant to use nitrogen and iron for chlorophyll production as well as aiding in oxygen reduction. Early sign of deficiency is yellowing between leaf veins in new growth. This is followed by necrotic or dead spots on leaves. As it progresses, it will gradually spread to older growth. The most obvious sign is when the leaf veins and margins remain green around the yellowing of interveinal areas. ZINC Zinc is vital for sugar and protein production. It also helps with the formation and retention of chlorophyll for healthy stem growth. Deficiency is common especially in alkaline soil and dry conditions. It is usually a result of high pH. Early signs include young leaves and new growth having interveinal yellowing, with small thin leaf fingers that wrinkle and distort. Then, discoloured and burnt leaf tips followed by leaf margins and finally brown spots. The most obvious sign is leaves that turn at a 90° angle. Good luck.