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Importance of some micro elements in the production of onion allium cepa cultivar giza 6 2. effect of soaking onion transplants in copper and manganese salt solutions on some onion bulb components



Importance of some micro elements in the production of onion allium cepa cultivar giza 6 2. effect of soaking onion transplants in copper and manganese salt solutions on some onion bulb components



Ain Shams University Faculty of Agriculture Research Bulletin (1363): 1-23



The effects of soaking onion transplants in salt solutions of CuSO4 (0.01%) and MnSO4 (0.2%) and their combinations on the bulb yield, carbohydrate and protein contents, disease resistance and storage period were studied. The polyphenol oxidase activity in the leaf extract was tested. Highest yields and dry weights were obtained by soaking the transplants in combined solutions of Cu (0.01%) and Mn (0.2%) for 3 h and in Mn (0.2%) separately for the same period. Results were more pronounced with Mn treatments than with Cu. The highest N uptake was obtained by soaking the transplants in combined solutions of Cu and Mn for 1.5 and 3.0 h. The content was markedly increased by soaking in Mn separately and in combination treatments, its maximum value obtained by soaking for 3.0 h in the combination treatment. Mn was more effective than Cu in increasing the carbohydrate content in the bulb. Cu treatment for 4.5 h gave the highest protein value. Soaking in Cu and in the combined solutions of Cu and Mn for 3 and 4.5 h stimulated polyphenol oxidase activity in the leaf. Cu and the combination treatments were more effective than Mn in the formation of phenols in the colored scales. The best values of lignin content were obtained with the Mn and the combination treatments.

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Related references

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