Hello guys, leaves started turning into yellow and...

Pretty normal for mid-late flowering, and as FR pheno finder said, the plant will "recycle" elements from the older leaves to use for flower growth. It is far more efficient for your plant to do so, than it is to grow flowers AND make these elements (carbs, sugars, amino acids etc) from new. It is one reason why defoliation is such a bad idea, It is best for your plant if you only remove the leaves once they have gone completely yellow, or even just leaving them until they fall off, is the most natural. Removing green leaves or only slightly pale leaves means your plant will have a reduced capacity to produce energy, which then means this reduced energy must be divided between growing flowers and making new growth elements, again, something defoliation advocates fail to understand. By leaving all the leaves to make energy for the growth of the flowers and also as a ready reserve supply of pre-made vital growth elements, means your plant can invest nearly all of the energy into flower production with very little energy being used to transport the previously made growth elements she has so cleverly "stored" in her older leaves, just for use during flowering. So, what your plant is doing is completely normal and no need for concern at this stage of flowering. Leaving the leaves until they are completely yellow will mean your plant gets the full benefit of energy production via photosynthesis, combined with a ready reserve of pre-made vital growth elements (carbs, sugars, amino acids etc) that she needs for flower growth and that require very little energy to be "redeployed". This way your plant is able to grow her biggest and best flowers and two principles of plant biology that defoliation advocates fail to realise/understand. Hope this helps,............. Organoman.

Being that your 3-4 weeks away from harvest your plants are at a stage where they are hungrier then normal. In your leaves you can see they are turning a lighter colour but you can also see brown spots. This is what’s known as rust or the very start of it. Rust happens typically in late flower and the culprit is usually a combination of Calmg and pk. If you adjust your formula ever slightly to have more of those minerals your plants will be rolling in no time. If leaf untreated you will notice leaves will yellow followed by dark spots on the leaves that will turn into the rust colour that gives it its name. This is then slows down bud production because your plants focusing on fixing itself rather then giving its energy to the flowers. I hope this information helps! -The Projexx

You are in late flower. Your plants are almost ready so they starting to take nutrients from older leaves to fat the buds up.