Information of PhD thesis Production and handling techniques for sap from inflorescence stalk of Nypa Palm after harvesting in a number of ecological zones in the Mekong Delta Major Crop Science Code[.]
Information of PhD thesis Production and handling techniques for sap from inflorescence stalk of Nypa Palm after harvesting in a number of ecological zones in the Mekong Delta Major: Crop Science Code: 62620103 Full Name: Le Thi Thanh Thuy Supervisors: Ass/Prof Dr Tran Van Hau The study was cariied-out at: Faculty of Agriculture and Applied Biology, Can Tho University Summary of thesis a) Investigating the current state of farming and the economic efficiency of Nypa palm b) ) Surveying bloom, blossom seasons and fruit development in freshwater, brackish water and seawater c) Stimulation techniques for sap exudation from inflorescence stalk in three waters above: - Determining the time of impact - Identifying the cycle and period of impact d) Treatment techniques after harvesting sap: - Surveying changes of sap after exudation - Determining the concentration of CaO and Na2S2O5 with prolonged effects in sap preservation These new results of the thesis: a) Leaves were the only product harvested from Nypa palm with low economic efficiency 800.000VND “lá đứng” and 1.800.000VND “lá chầm”/ 1.000m2/ year b) Nypa palm bloomed in two periods of time: January to March and November to December Fruit stalk growed to a maximum size since six months from bloom Fruit stalk weight, fruit stalk perimeter (height and width), length and size of inflorescence stalk in seawater were always smaller than those in freshwater and brackish water The number of fruits in total/ fruit stalk and healthy fruit ratio made no difference in the three waters c) The impact that may get sap from inflorescence stalk: clearing all outer layers of the stalk, bending the stalk by hand in the same direction 12 times, using a wooden pestle pat lengthwise the stalk on both sides (32 times/ side) and using the smaller side of the pestle hit four times at the stalk root in the same place with the impact cycle days/ time which was taken continuously in weeks in the seawater and freshwater and weeks or weeks in brackish water when inflorescence stalks age 4.5 to 6.0 months (70-100 cm, the perimeter of width and height) The average sap productivity in freshwater, brackish water and seawater were 880 ml; 1,190 ml and 800 ml/ stalk/ day, the time of sap harvesting were 46 days (brackish water) and 57 days (seawater) Brix degree, sucrose, total sugar in seawater were always higher freshwater and brackish water d) The sap was damaged and lost the sense of form, taste and color after hours since beginning exudation To maintain the quality of sap up to hours after exudation, using CaO (the concentration 1.0 g/ L) or up to 15 hours using Na 2S2O5 (the concentration 1.6 or 1.8g/ L) Applications Proposing a stimulation process for exudation of Nypa Palm (The valid decision from the Director of National Office of Intellectual Property of Vietnam provided the invention “The sap production process from inflorescence stalk of Nypa Palm”, number: 77672/QĐ-SHTT date 23/12/2014) and identified sap preservatives during haversting From that opening up the potential exploitation of Nypa palm, creating new resources for food processing industry such as sugar, alcohol, vinegar… Supervisor Ass Prof Tran Van Hau Doctorian Le Thi Thanh Thuy CERTIFICATION OF CANTHO UNIVERSITY Rector ... and height) The average sap productivity in freshwater, brackish water and seawater were 880 ml; 1,190 ml and 800 ml/ stalk/ day, the time of sap harvesting were 46 days (brackish water) and 57... 46 days (brackish water) and 57 days (seawater) Brix degree, sucrose, total sugar in seawater were always higher freshwater and brackish water d) The sap was damaged and lost the sense of form,... to hours after exudation, using CaO (the concentration 1.0 g/ L) or up to 15 hours using Na 2S2O5 (the concentration 1.6 or 1.8g/ L) Applications Proposing a stimulation process for exudation of