Evaluation of Clonal Propagation of Hemp Cultivar 'TJ's CBD'

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Cornell Hemp http://hemp.cals.cornell.edu Evaluation of clonal propagation of hemp cultivar ‘TJ’s CBD’ in different media types Allison DeSario, Teagan Zingg, Larry Smart – Horticulture Section, Cornell AgriTech, Geneva NY Importance of clonal propagation: Clonal propagation is necessary for maintaining lines of genetically identical plant material. This is useful for large-scale experiments to study traits of a particular cultivar, such as evaluation in field trials. It is also one way to establish a field with only female hemp plants. Rooting in different media: Cuttings in coco coir plugs The chosen media must have certain characteristics such as- ample pore space, ability to hold water, ease of transplant, ability to physically support the new cutting, etc. In this experiment we compared three types of media: rockwool cubes (Grodan), coco coir plugs (Riococo), and potting soil (Lamberts LM 111) Experimental design: Cuttings with 2-4 nodes were taken from a ‘TJ’s CBD’ mother plant at various locations on the plant (i.e. ontologically different ages), dipped in rooting hormone (Clonex gel), stuck in designated media, and placed in a mist chamber. Cuttings were checked daily to ensure they did not dry out, misting with a spray bottle when necessary. Fresh cutting dipped in Clonex gel before being stuck in media Data collection: 24 days after sticking the cuttings, they were uprooted from their media and the root vigor was scored based on: 0-no signs of rooting, 1-root primordia/callus formation, 2-moderate rooting, and 3-heavy rooting. The graph below breaks down the data from categories 0, 2, and 3 above Results: each media had a unique strength Cuttings stuck in rockwool had the most formation of fine root hairs. Cuttings stuck in coco coir had the most successfully rooted cuttings, based on visual assessment of root vigor scoring. Cuttings stuck in potting soil had the most prolific root growth. Considerations: Rockwool is inorganic so the decision about waste management arises. Coco coir dries out quicker than potting soil, so Above: Cuttings 24 days after sticking the timing of removal from mist chamber to in coco coir plugs transplant is crucial. Below: Same conditions, with coco Cuttings in potting soil tend to get root bound coir removed before transplanting can occur..

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