2018 ASHS Annual Conference

Light intensity and nitrogen is required to increase leaf growth under CO₂ enriched conditions. The first, second, third, fourth, and fifth emerged leaf growth was investigated under 800 μmol·mol^-1 CO₂ during 40 weeks with two light intensity (150 and 300 μmol∙m^-2∙s^-1) and four nitrogen concentrations (N1 (0.013 kg∙L^-1), N2 (0.033 kg∙L^-1), N3 (0.053 kg∙L^-1), and N4 (0.073 kg∙L^-1)). Phosphate (0.013 kg∙L^-1) and potassium (0.013 kg∙L^-1) was supplied at each treatment. At N2, total number of leaves increased in the plants under 300 μmol∙m^-2∙s^-1 than the plants under 150 μmol∙m^-2∙s^-1. Survival rates were 100, 93, and 60 % in the plants with N1, N2, and N3, respectively, grown under 150 μmol∙m^-2∙s^-1. Survival rate was 100, 100, and 80 % in the plants with N1, N2, and N3, respectively, grown under 300 μmol∙m^-2∙s^-1. At N1, the length and width of the second, third, fourth, and five emerged leaves was not significant between 150 and 300 μmol∙m^-2∙s^-1. Leaf span decreased by increasing nitrogen supply, regardless of light intensity. Plants were not survived at N4 in 150 and 300 μmol∙m^-2∙s^-1. Overall, Plants survival could improve under 300 μmol∙m^-2∙s^-1 compared to 150 μmol∙m^-2∙s^-1 and nutrient supply at N2 is economic benefit for farmers, considering leaf span. This work was carried out with the support of “Cooperative Research Program for Agriculture Science & Technology Development (Project No. PJ01206901201801)” Rural Development Administration, Republic of Korea and a grant (NRF-2015R1C1A1A02037704) from Nation Research Foundation of Korea.