factors affecting seed quality during storage

Even in ideal storage conditions seed will soon lose viability if it is defective from the start. Factors to be considered are: Seed maturity. endobj 7. [��6%|� ��D�L8��v,�Bp?{��9��4�?�˹��%��Dr��? 6. In sealed storage, seed moisture content determines the relative humidity of the environment in the containers. The higher the moisture content of the seeds, the more they are adversely affected by temperature. It can be concluded by this study that the quality and storage life of tomatoes after harvest depends on not only the postharvest factors alone but also some preharvest factors during production and, until both factors are managed properly, quality loss will still be a major challenge for … 2 0 obj Seed quality 3. Increase in O2 pressure decrease the period of viability. The safe moisture content, however, depends upon storage length, type of storage structure, kind/verity of seed, type of packaging material used. Depending upon the severity of damage, or degree of deterioration, E. g extent of weathering damage, mechanical injury, flat, wrinkled or otherwise damaged seed, even seed lots of good germination, at the beginning of storage, can and do decline rapidly within a few months. Some... 2. Seed quality depends upon the physical conditions that the mother plant is exposed to during growth stages, as well as harvesting, processing, storage and planting. Adverse weather conditions after planting regularly influence the germination processes by affecting moisture, temperature, and oxygen levels. The seed storability is considerably influenced by the kind / variety of seeds. Decreasing temperature and seed moisture, therefore, is an effective means of maintaining seed quality in storage. %�� <> Factors Affecting Longevity in Storage Seed condition. Rodent , control measures include building the store so that the floor is 90 cm above ground level at the entrances ; having a 15 cm lip around the building at the 90 cm level of the floor; and providing a removable deck at the entrance for use only when seed is being loaded or unloaded. Deterioration in seed quality may begin at any point in the plant’s development stage from fertilization onward. All openings should be sealed, or screened, if needed for ventilation. The higher the moisture content of the seeds the more they are adversely affected by temperature. ?ncZuS��L�((�K��o(�Mp��`�� h�Ga�u D��ս3 The seed lots having vigorous, undeteriorated seeds store longer than deteriorated lots. It does little good to construct excellent warehouses if the seeds lose their viability subsequently by improper storage in transit, or at the retail store, or at the user’s farm. The important consideration in the control of seed micro flora, is the relative humidity of the inter-seed atmosphere. Maintenance during seed storage 1. Seed placed in an environment with a relative humidity higher or lower than that with which its moisture content is in equilibrium , will gain or lose moisture until an equilibrium is established with the new environment . 1 0 obj Physical factors affecting seed quality during storage Many factors determine the longevity of seeds during storage. Your email address will not be published. Testa quality and physiological age are two principle components of pea, lentil, faba bean and chickpea seed quality. At this time there are no satisfactory chemical methods of control of these organisms in storage. �@��d)�y>� ��0p��'��[��|`��Ɖ�s��z�̵m!�Ԛ��-By��}��Đ��$>,;�p8[:pQ��s��h�k}�+Ze��7��P�g��KC��"nyX��A��Hd�o;�Q��`l��Œ��;dP��)!��=�� cJ=iv|J��S��~��V e2��s��ЃH�A� V��+�1�A�ޖ�$ Tz�= By�� Contact insecticides – used in seed storage include DDT, lindane and Malathion. Bacteria and fungi. Maintain Cool Conditions Keep seeds out of direct sunlight in a cool spot that maintains a fairly consistent temperature. ��;[y0%Ec��9��$��j�]��.t�}t�8��_�8�CMI��>N9��o�6�ظ�QtlTK��,�h��hU1l�m�cK�2Y�h��g3elR|��[�Y��=|(��_��|O�SNf��V��56׼1�(��GΑF��z��G'�h��|!��1�@�6��XI�G|Ќt�}��P��} 1}�tOQ@�蜀� F��V�>ŋ^}�~��x�e�?3�%'�7e�� oMϥw��.��H J�M�#�K�m��+�>��l��- ns�+�u��w�Y��w�`I��z� �j@��g�2p��1�x\�� Special Effect of Extreme Storage Conditions on Viability: Researches indicate that three sets of extreme storage conditions of temperature and moisture contents, say about 30 percent, in cereals provided the temperature is suitable, germination will result in loss of viability when seeds are very moist, thirdly , if seeds are subjected to extreme desiccation , the period of viability may be less than expected. Seeds attain specific and characteristic moisture content when subjected to given levels of atmospheric humidity. With regard to effect of temperature on the growth of the micro-flora, certain organisms can grow at temperatures as high as 80 0 C. Consequently , since high temperatures rapidly decreases seed viability , the only practical method of controlling micro-flora activity by temperature alone is by deep freezing. © 2020 - Agriculture. The effects of initial seed quality, storage duration, temperature, and moisture on loss in germination during storage are quantified and advice is given on seed storage environments. Adequate storage precautions at all these points, therefore, are also necessary. Provenance: It has already been stated that a number of factors, operating before and during harvest can affect seed viability. Seed attain a rather specific and characteristics moisture content when subjected to given levels of atmospheric humidities. &ϧ�P��t��}��?� ��a��w�#T?�e��˕�o�)�~�t��И ?��j��mۀP�Y�V��w��,JG�)�4��q$�A��t��0�ͻ��1��{]ñz8��X! Moisture Content and Storage Life of Cereal Seeds at Temperatures not Exceeding 90 0 F for Seeds of High Germination and High Vigour at Start of Storage (Harrington and Douglas, 1970). Within the normal range of biological activity of seeds, insect and moulds increases as temperature increases. <>/XObject<>/ExtGState<>/Pattern<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/Annots[ 14 0 R] /MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> It is suprising then that samples of seed obtained from different sources may show differences in viability behaviour. The most influential factors in the storage of grains is moisture and temperature. %PDF-1.5 The optimum temperatures for insect activity of more important storage insects ranges from 28 to 38 0 C. The temperatures below 17 to 22 0 C are considered unsafe for insect activity. The mediocre quality seed may be retained only for the next plating seasons. Save my name, email, and website in this browser for the next time I comment. The low quality seed should invariably be rejected. The little work carried out on the use of antioxidants shows that heat injury to kidney bean embryos was decreased in reduced oxygen pressures, and that the application of cysteine overcame the injury to some extent. Purpose and significance of safe seed storage 1 The seed, a fragile, living organism 2 From harvest to sowing 4 Decline and death of seeds 5 Scope of publication 6 Seed factors that affect storage life 7 Genetic effects 7 Variation among species 7 Variation among cultivars 8 Generalizations 8 … '��z?�0g�w��S��Hav�=_�xo�A`tA��!�Br�z�ַ{c]��2�A��HBi�)��ϨR�EQ�1FqJ/��Ĩ�OLX%��Ir��l~ Z�9��@�5��(�8�M�V��]��A{��Q��6��L G��kؼρ�*�ۀ��&j��FۜT�"}��a�. Quality of the seeds Quality of the seeds can be greatly influenced by various environmental conditions from the stage of physiological maturity to harvest. Seed vigor can be affected by maturity, age, mechanical injuries, disease infection, preharvest weather, and storage environment. during handling affect the viability and vigour of soybean seed during storage. Gas during storage . 10. Abiotic factors 2. endobj

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