leaves bend downwards and brown spots on the leaves

cv

no diary, no possible help...

Hello! Phosphorus deficiency isn't very common, but it can be quite problematic. If it affects the plants during the vegetative stage, it can lead to reduced growth rates, small leaves, weak roots, and generally lackluster plants. In the early stages, phosphorus deficiency usually causes the leaves to appear dark but faded, with very dark veins and the leaf tissue being a bit lighter. As it progresses, purplish discolorations start to appear on the main part of the leaves, and the edges of the leaves begin to turn brown and curl downwards. Additionally, the petioles of the leaves (the small stem that connects the leaf to the main stem) may start to take on a purplish color. In the final stages, large spots on the leaves turn brownish-purple and die, while the remaining sections become speckled with yellowish-green. How to fix phosphorus deficiency There are several ways to address a phosphorus deficiency. Just remember to take it easy. If you overdo any remedy, the plant could end up not getting enough of the other nutrients and be worse off than if nothing had been done. That said, here are some methods to fix it: Temperature: don't let the temperature drop below 15 degrees Celsius, as cooler temperatures make it harder for cannabis plants to absorb phosphorus. Also, the water temperature should be between 18/20ºC. Water properly: make sure to water the plants correctly. Too much water and overly compact soil can lead to phosphorus deficiency. pH products: Use a pH corrector to ensure that the roots have the correct pH level. Soil should be around 6.2/6.3 during those weeks, and in coconut substrate, it should be 6.1/6.2. Add phosphorus sources: add phosphorus-rich sources to the soil or substrate. Some options include fish meal, warm worm humus, soft rock phosphate, or any fertilizer that contains phosphorus in its composition. Hope this helps you, my friend!