Hemp requires reasonably accurate fertilisation. Fertilisation that is too low or too high leads to yield reductions. For optimum growth, about 110 units of nitrogen (N), 80 kg of phosphate (P2O5P2O5) and 140 kg of potassium (K2OK2O) are recommended per hectare for technical applications (excluding the soil stock from the calculation).[1] This is applied before sowing. Excessive nitrogen application can result in lower yields due to heavy stems lying flat, and stronger competition for light by individual plants leading to uneven plant height and problems at harvest. Excessive N combined with too little K can cause stem breakage.
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For textile applications
Nitrogen application for hemp textiles is lower than for technical applications: 70 - 100 units of active nitrogen (N), 40 kg P2O5P2O5, 110 kg K2O K2O and 30 kg MgO per hectare.[2]
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