Effects of different photoperiods and fertilization ratios on the industrial hemp growth in the protected cultivation
In order to explore the effects of different photoperiods and fertilization ratios on the industrial hemp growth and CBD yield in the protected cultivation,one-year-old industrial hemp strains were used as the material,and three photoperiod treatments and 3-factor(nitrogen,phosphorus,potassium),4-level fertilization experiments to were set up screen out the best light supplement scheme and the best fertilization ratio.The results showed that industrial hemp had the highest agronomic index,leaf yield and CBD yield un-der the 18 h/d photoperiod,and the leaf photosynthetic rate was also the highest under this treatment;the highest Leaf yield,CBD yield,yield effect value,fertilizer agronomic efficiency and fertilizer contribution rate were achieved under N1P2K2(P2O5:5.18 g/pot,K2O:5.18 g/pot,N:7.00 g/pot)treatment,and the photosynthetic parameters and relative chlorophyll content were also at the highest level.This study concluded that the photoperiod of 18 h/d and the fertilization level of N1P2K2 were the most conducive to the increase of industrial hemp production and CBD yield,which had certain reference value for the efficient cultivation of industrial hemp in the protected cultivation.
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