Experiments with different materials for hanging hop bines
The object of the field experiment was to find out the force at break of the hop string (or possibly the attachment) at pulling down the bines, to compare the strength of the used materials before and after the hop growing season, to observe the spontaneous falling over the growing season, and to determine the amount of the costs. Force at break for all twines (jute, hemp, poly, wire) exhibited strength decline due to climatic conditions in the hop field higher than 50%. Analysis of spontaneous falling of hop bines showed best results with attachment made of hemp, the fallen bines ranging from 0 to 0.2%. Tear tests confirmed that with jute twine its production cannot ensure a compact structure, a fact which leads to a high variability in the strength at break. Thus the results clearly indicate the substitution of polypropylene for hemp twine exhibiting the best results from all the tested variants.
Heřmánek, P., Rybka, A., Honzík, I. and Vent, L. (2019). Experiments with different materials for hanging hop bines. Acta Hortic. 1236, 37-44
hop, hop string, attachment