Author(s): Dr. Nguyen Trinh Nhat Hang

Abstract: MD2 pineapple (Ananas comosus L.) was an imported cultivar into Vietnam, which was introduced to the model of growing pineapple on acid sulfate soil of Tien Giang province in 2019. Planting density and flowering rate were major factors incluencing pineapple productivity. Experimenting with planting density and flowering treatment on MD2 pineapples grown in acid sulphate soil of Tan Phuoc dictrict, Tien Giang province aim to determine the plant spacing corresponding to appropriate density and flowering treatment substance to increase flowering rate and yield of MD2 pineapple. The present study were two experiments that were arrange in a randomized complete blocks design (RCBD). The trial (1) was four planting density including T1 (38400 plants/ha), T2 (34100 plants/ha), T3 (30700 plants/ha), T4 (40000 plants/ha). The trial (2) was five dose of flower forcing such as 5 g/L CaC2, 10 g/L CaC2, 15 g/L CaC2, 30ml/L Ethephon and 60ml/L Ethephon. The results indicated that fruit weight without crown produced by treatments T1, T2, T3 (1.575 kg/fruit, 1.543 kg/fruit and 1.605 kg/fruit, respectively) were greater than control T4 (1.390 kg/fruit). Treatment T1 was highest in fruit yield (28.73 tons/ha). At Ethephon 60 ml/L had an earlier flowering time (23.8 days), the a higher percentage of flowering (94.2%). Ethephon 30 ml/L - 60 ml/L were lower shoot crown weight (265.1 g/crown - 288.5 g/crown).

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