Yield and quality of head lettuce after 24-epibrassinolide application under optimal and reduced irrigation
2012
Koudela, M., Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Zahradnictvi | Hnilicka, F., Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Botaniky a Fyziologie Rostlin | Martinkova, J., Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Botaniky a Fyziologie Rostlin | Svozilova, L., Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Zahradnictvi | Dolezalova, J., Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Zahradnictvi
Field trials were carried out in 2009 and 2011 in order to evaluate the influence of 24-epibrassinolide on the yield and quality of head lettuce (cultivar Santoro - Rijk Zwaan) in optimal and reduced moisture conditions. Irrigation was carried out by microspraying. It was based on current values of efficient water capacity (EWC); the critical value of the EWC was 80% for optimally irrigated fields (irrigation O), and 50% for variants with reduced levels of irrigation (irrigation S). The total amount of irrigation water during the vegetative period was as follows: irrigation O - 131 mm in 2009 and 123 mm in 2011; irrigation S - 58 mm in 2009 and 63 mm in 2011. Three variants were in both irrigation conditions: A - no application of 24-epibrassinolide, B - 1 x 24-epibrassinolide applied immediately a fter planting, C - application of 24-epibrassinolide 2 x (immediately a fter planting and 14 days a fter the 1st application). The concentration of 24-epibrassinolide was 10**-6. The following variables were evaluated after the harvest: weight of single heads, number of marketable heads, marketable yield (in pcs/ha and t/ha), and concentrations of ascorbic acid and nitrates. The only significant effect of 24-epibrassinolide application was observed with the number of marketable heads per ha and irrigation O. In comparison with controls it increased on average by 11.1 % (variant B) and by 14.7 % (variant C).
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