The study of effective fertilizer applications in off-season longan (Dimocarpus longan Lour.) production

Abstract

     A good fertilizer management, according to plant development, is an important method for longan production to promote growth for good quantity and quality. For the fertilizer application with 7 fertilizer formulae on “Daw”, 7-9 years old longan trees for 3 years during March 2017 to July 2020. The results showed that all treatments were no significant differences among treatments over 3 years on number of fruits per kilogram in the first year ranged from 110.82-121.93 fruit/kg, and tended to decrease in the second year (104.10-120.77 fruit/kg) and the third year (91.14-115.31 fruit/kg), this indicated the increase in fruit size. The yields per tree in 3 years were ranged from 24.68-46.28 kg/tree, 11.00-35.13 kg/tree and 21.03-46.86 kg/tree, respectively. There were no significant differences over 3 years in aril weight ranged from 6.23-6.87 g, 7.33-8.24 g and 6.16-7.73 g and total soluble solid ranged from 19.08-21.68 °Brix, 17.61-19.22 °Brix and 19.19-21.23 °Brix, respectively