Abstract
Brassica oleracea var italica occupies a special place in the internal and external market of vegetables seeds. Vegetables producers demand seeds with high degree of purity, germination and vigor, since seeds' quality is the basis for the success of the production. In this work, broccoli seeds were coated in a spouted bed, by an aqueous suspension of hidroxy-ethyl-cellulose. Effects of the operating variables: spouting air temperature, atomizing air pressure and coating suspension flow rate over the dependent variables: seeds germination, seeds accelerated aging and the speed of seeds germination in soil, were investigated in a factorial scheme trial. The maximum processing time was 120 min. A totally randomized experiment evaluated and compared seeds germination and vigor of the coated and non-coated seeds. There was no identifiable, pronounced difference on germination of coated and non-coated seeds, accelerated aging of seeds, and speed of seeds germination in the soil. Coating with hidroxy-ethyl-cellulose in the spouted bed did not alter broccoli seeds physiologic quality. The surface of coated seeds presented satisfactory distribution and spreading of the polymer film, uniform and individual coating and homogeneous aspect.
Highlights
The seed coating process involves all aspects of sticking materials onto the surface of seeds
The aim of this work was to determine possible changes in the physiologic quality of broccoli seeds submitted to coating with aqueous suspension of hidroxy-ethyl-cellulose (HEC), as well as to assess the coating quality concerning homogeneity and uniformity with purpose of giving maintenance to the quality of the seeds
Experimental design A 2 × 3 factorial design with four central points was used to investigate the effect of the independent variables: coating suspension flow rate (Ws), spouting air temperature (Ta), and atomizing air pressure (Pa), on the seed germination and vigor, assessed by the tests of accelerated aging, and springing in soil
Summary
The seed coating process involves all aspects of sticking materials onto the surface of seeds. The term “coated seed” has been applied to a seed, which was either pelleted, coated or covered with an adhesive film. Such procedures are adequate for about 90% of small seed species. Of high aggregated value, like hybrid flower seeds, usually obtained in small amounts, should never be coated because the risks involved with the process may far exceed the benefits (Taylor & Harman, 1990). Above 35°C the germination was significantly dwindled This behavior was attributed to the seed sensitivity to mechanical attrition and thermal exposures, which is an intrinsic characteristic of each species. The aim of this work was to determine possible changes in the physiologic quality of broccoli seeds submitted to coating with aqueous suspension of hidroxy-ethyl-cellulose (HEC), as well as to assess the coating quality concerning homogeneity and uniformity with purpose of giving maintenance to the quality of the seeds
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