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A critical review of industrial fiber hemp anatomy, agronomic ... bioresources.cnr.ncsu.edu BioResources 4 facts
claimPhosphorus fertilization affects industrial hemp plant height, tensile strength, and elasticity of bast fibers, but does not affect grain, stem, or biomass yield.
claimThe optimal period to harvest industrial hemp for bast fiber is before the grains are completely mature, which is typically 70 to 90 days after sowing.
claimTo obtain high-quality bast fiber from industrial hemp, the plant should be harvested before grain and cannabinoids begin to develop.
claimSecondary macronutrients and micronutrients such as magnesium and calcium have slight effects on industrial hemp plant growth but no direct effect on grain and bast fiber yield, with the exception of boron and copper.