There are 17 chemicals in cultivating cannabis plants that are critical to how it will grow. Firstly, from the most important nutrients which are N, P, K, (nitrogen, phosphorus, potassium). Another uncommon chemical called Boron can be a culprit. It is rare but this will affect your yield if you let it. Most often, potassium or nitrogen deficiency follows along after. Boron is a help-nutrient of cannabis to use calcium. This first affects the weed’s growth rate, then extends to the extremities to your precious leaves most commonly known marijuana boron deficiency.
The Leaf color will appear yellow-brown to burnt brown and other leaves may exhibit a pale color. Some become dark blue/purple with spots. The growth of your cannabis can slow down by this deficiency and later on will suffer from calcium deficiency.
What Should I Do to Prevent or Cure Boron Deficiency?
The absorptive capacity of a nutrient relies on the pH or the measure of the acidity of a solution. Soil-grown weeds must be in a 6.0-7.0 pH level while those grown hydroponically should be in a 5.5-6-2 pH level to absorb Boron. It is not caused by potassium and nitrogen because it is not absorbed without these. Also lack of water in plants triggers the deficiency as there will be no medium for the nutrients to absorb. This is true hydroponically and in soil-grown. Furthermore, Low relative humidity can also trigger Boron deficiency.
If symptoms appear, cleanse your plant by first watering them. After a while, add your liquid fertilizers to ease their recovery. Using a pH pen, get the pH level of the water and if out of range, adjust by using some chemicals. Acids can lower the pH and basic solutions can increase it.