Effect of seed pelleting with different matrices on physical characteristics and seed quality of lettuce (Lactuca sativa)
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Abstract
A suitable type of pelleting material is essential for the successful development of a lettuce seed pelleting formula. Pelleting seeds with calcium sulfate (CaSO4) alone or CaSO4-zeolite resulted in easy pellet formation when carboxymethyl cellulose (CMC) 0.4% (w/w) was used as a binder material. Pelleting seeds with CaSO4-bentonite caused them to be the highest friability. However, pelleting seeds with CaSO4 only, with CaSO4-zeolite, and with CaSO4-pumice resulted in a minor friability of the seeds. When tested under laboratory and greenhouse conditions, it took 21 seconds for the coating of seeds pelleted with CaSO4-zeolite to dissolve in the water, which was considered a slow dissolution, and it did not affect their germination. In addition, when tested in laboratory conditions, seeds pelleted with CaSO4-zeolite had a longer root and shoot lengths compared to the non-pelleted seeds. Therefore, pelleting seeds with CaSO4-zeolite (30 g of CaSO4, 100 g of zeolite) using carboxymethyl cellulose (0.4% w/w aqueous) was the most appropriated formula for ‘Red Oak’ lettuce seeds.
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