In 2006, Cambodian Agriculture Research and Development Institute (CARDI) bred a high-quality tomato ‘Neang Pich’ variety. Since ‘Neang Pich’ is susceptible to Sclerotium rolfsii (S. rolfsii), it is severely affected the production major tomato growing regions. This study was conducted to evaluate the effect of seven S. rolfsii tolerant rootstocks on growth and yield in graft cultivation of ‘Neang Pich’ tomato. ‘Neang Pich’ seedlings were used as scion and non-grafted control. Six eggplant genotypes (‘2017053’, ‘2017062’, ‘17CJVC2’, ‘No. 80’, ‘VI041979A’, ‘VI041996’) and a commercial tomato variety (‘Hulk’) were used as rootstock. The grafted and non-grafted tomatoes were grown in a plastic greenhouse and open field. The survival rate of plants did not differ between plastic greenhouse (80.2%) and open field (79.5%). The top and root fresh weight of plants grown in a plastic greenhouse increased by 77% and 11% compared to the open field and the dry weight increased by 48% and 10%, respectively. The top (309 g) and root (18.9 g) fresh weight, and the top (90.5 g) and root (6.39 g) dry weight depending on rootstock were the highest in plants grafted onto ‘2017062’. The yield of tomatoes in a plastic greenhouse (19.5 MT/ha) was 65% higher than that of open field (11.8 MT/ha). The yield of tomatoes depending on rootstock were the highest in ‘2017062’ (17.8 MT/ha). The effect of cultivation practice and grafting on pH and sugar content (oBrix) of the fruit was non-significant difference (p0.05). The scion diameter, top fresh weight, fruit weight and yield (MT/ha) were significant difference (p0.05) in the interaction effect between tomato cultivation practices (plastic greenhouse and open field) and rootstock.

INTRODUCTION
MATERIALS AND METHODS
    Experimental site and plant materials
    Raising of seedlings and graft preparation
    Inoculum preparation of S. rolfsii
    Field preparation and cultivation
    Plot design
    Data collection and analysis
RESULTS AND DISCUSSION
    Plants survival rate and stem diameter in a plasticgreenhouse and open field
    Plants survival rate and stem diameter dependingon rootstock
    Plants height, fresh and dry weight grown in a plasticgreenhouse and open field
    Plants height, fresh and dry weight depending onrootstock
    Characteristics and yield of fruits in a plastic greenhouseand open field
    Characteristics and yield of fruit depending on rootstock
    Conclusion and recommendation
적 요
ACKNOWLEDGMENTS
REFERENCES

• Ouch Sreyneth(Cambodian Agriculture Research and Development Institute (CARDI), Phnom Penh, Kingdom of Cambodia)
• Thun Vathany(Cambodian Agriculture Research and Development Institute (CARDI), Phnom Penh, Kingdom of Cambodia)
• Orn Chhourn(Cambodian Agriculture Research and Development Institute (CARDI), Phnom Penh, Kingdom of Cambodia)
• Young-Ju Song(Korea Partnership for Innovation of Agriculture (KOPIA) Cambodia Center, Phnom Penh, Kingdom of Cambodia)
• Eung-Ho Lee(Korea Partnership for Innovation of Agriculture (KOPIA) Cambodia Center, Phnom Penh, Kingdom of Cambodia) Corresponding author