Key points and questions from the study for discuss :
a)Is it underfeeding realistic ? After complete withheld of one of the elements the plants show first visual signs of deficiency earliest for some elements after 6 weeks , for some after 9 weeks , and Mo disorder didnt develop at all . Is it underfeeding realistic or nutrition disorders are usually result of other factors ?
b)Does all nutrition disorders affect the production/biomass ? Surprisingly only N, K , B , Cu produced significantly less crop biomass .
c)Undervalue the importance of Cu ? Plants with Cu disorder produced 45% less biomass .
d)Overvalue the importance of P ? Plants with visual signs of P had only 0.09% in the plant tissue .
The last is not a surprise the cannabis /hemp nutrition programs are moving drastically cutting the P from their formulas , many studies show the low need of P for cannabis sativa . But we still have on the market expensive Bloom Booster that they harm more then help .