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NGÔ MINH DŨNG. 2021. Compact fluorescent light manipulation to enhance off-season flowering for dragon fruit crop (Hylocereus undatus (Haw) Britt. and Rose). PhD Thesis. The Institute of Agricultural Sciences for Southern Vietnam.
Thứ hai, 10-05-2021 | 09:23:46

ABSTRACT

 

The study aims at identifying CFL (compact fluorescent light) treatment specified with low power of 20W, which significantly replaces 60W light to induce dragon fruit crop blooming.

 

Surveys on Bình Thuận, Tiền Giang, Tây Ninh were conducted on 2013 December. 100% farms used CFL manipulation to enhance off-season flowering for dragon fruit crop số hộ trồng thanh. 60W light treatment obtained 35-40 flower buds/hill; 15-17 kg/hill. However, electric consumption increased the production cost.

 

CFL treatment released its light profile similar to phytochrome absorption and photon density at red and far red profile. CFL23 is well adapted to dragon fruit crop based on enhancing red and far red profile. The treatment included 9 CFLs to be improved at field conditions. Three of all are useful. Treatment CFL 6, 5, and 9 expressed 20.28 μmol.m-2.s-1, 18.53 μmol.m-2.s-1 and 18.29 μmol.m-2 .s-1, respectfully. The experiments were conducted at Bình Thuận, Tiền Giang and Tây Ninh, in three continuous seasons. CFL- 20W NN R (CFL 6) impacts off-season blooming as well as 60W lamp treatment.

 

For cv. White DF, treatment of 60W lamp obtained 28.3 flower buds and 13.3 kg per hill. Treatment of CFL 20W NN R obtained 27.7 flower buds and 12.8 kg per hill.

 

For cv. Red DF, treatment of 60W lamp obtained 29.8 flower buds and 12.3 kg per hill. Treatment of CFL 20W NN R obtained 28.2 flower buds and 11.7 kg per hill.

 

New treatment of CFL 20W NN R saved one hour of lighting for both cultivars White and Red DF. It means 33.47% to be decreased in production cost due to electric saving. Farmers in Tay Ninh, Binh Thuan  can save VND 38.4 million /ha/year.

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