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This work was carried out during  the two successive summer seasons of 2013 and 2014 at  a Private Vegetable Farm in El-Khattara distract, Sharkia, Governorate,  to investigate the effect of  different  application methods and concentrations of chitosan  ( 0, 0.025, 0.075 and 0.125 %) on  growth , yield , tuber roots quality and storability of sweet potato cv. Buregard grown under sandy soil conditions using drip irrigation system.  Dipping the base  of the stem cuttings in chitosan solution  before planting + foliar spraying of the plants with chitosan was the best method for  increasing dry weight of shoots, N,P and K uptake  by shoots, marketable yield and total yield and  also, for decreasing weight loss (%) and decay (%) in tuber roots during storage period.  Chitosan solution 0.075 % increased  growth, average tuber weight , total yield, starch and total sugar in tuber roots, whereas chitosan 0.125 % increased chlorophyll a, total (a+b) in leaf tissues, N,P and K uptake by shoots and marketable yield  and also recorded  minimum values of weight loss and decay (%) in tuber roots during storage period. Dipping  the base of the stem  cuttings  in 0.075 % chitosan solution  before planting + spraying plants with 0.075 %  chitosan solution gave the highest values of  vine length , dry weight of shoots/ plant, chlorophyll a and  total chlorophyll ( a+b) concentration in leaf tissues, average weight of  tuber root, total yield , whereas  the same treatment gave the lowest values of weight loss percentage and decay (%) in tuber roots during storage period. On the other hand, the base of stem cuttings  in 0.125 % chitosan solution before planting + spraying plants with 0.125 %  chitosan  gave the highest values  of   N,P and K uptake, marketable yield, starch and total sugar contents in tuber roots. Conclusively, from the  foregoing results of this study, it could be concluded that, under the same conditions, dipping  the base of the stem  cutting  in 0.075 % chitosan solution  before planting + spraying plants with 0.075 % chitosan solution three times at 15 days intervals beginning 25 days after transplanting gave the best interaction treatment for increasing plant growth, yield and its components, tuber roots quality and  storability  of sweet potato plants.

journal of productivity and development/journal of productivitiy and development

EFFECT OF APPLICATION METHODS AND CONCENTATION OF CHITOSAN ON GROWTH, YIELD, TUBER ROOTS QUALITY AND STORABILITY OF SWEET POTATO PLANTS GROWN UNDER SANDY SOIL CONDITIONS