The Use of Modified Leonardite for Water Convolvulus Growing in Clay Soil

Abstract

The objective of this research is to study the effect of modified leonadite on growth and yield of water convolvulus growing in clay soil. The experimental design was Randomized Complete Block Designs consisted of water convolvulus grown in 2 x 1 meters of plot size, with 3 replications and 3 treatments. The treatments were (1) without modifying leonardite, (2) with modified leonardite at the rate of 2.5 tons per Rai, and (3) with modified leonardite at the rate of 5 tons per Rai. Statistical analysis were Analysis of Variance and Duncan’s New Multiple Range Test (DMRT) at 0.05% of confidential level. The research was conducted at Bang Duea sub-district, Muang Pathum Thani District, Pathum Thani Province. The result found that all treatments were not significantly different between plant height, number of leave and yield at 7, 14 and 21 days after planting (P>0.05). The application of modified leonardite at the rate of 5 tons per Rai had taller plant for water convolvulus at 7 days after planting (p<0.05). Water convolvulus had highest fresh weight at 14 days after planting (p<0.05) and the highest of fresh weight and dry weight were at 21 days after planting (p<0.05). There were not significantly different between plant height and stem diameter of water convolvulus at 7, 14 and 21 days after planting under all treatments. Water convolvulus with modified leonardite at the pace of 5 tons per Rai had highest fresh and dry weight at 7 days after planting (p<0.05), highest fresh weight at 14 days after planting (p<0.05) and highest number of leaves, fresh weight (p<0.05) and total yield at (p<0.01) at 21 days after planting.