Effects of nitrogen concentration on growth and leaf nutrient content of longan in lysimeter

The effects of nitrogen concentration on growth and leaf nutrient content of longan was studied on two year old grafted 'Do' longan trees were grown in lysimeter filled with fine sand. The experimental design was CRD with 0, 56, 112, 224 and 448 mg L-1 N of nitrogen concentration. The results suggested that the concentration of nitrogen at 56, 112, 224 and 448 mg L-1 N had the higher plant height than at 0 mg L-1N. The concentration at 448, 112 and 224 mg L-1 N gave the higher number of flushed leaves per plant than at 56 and 0 mg L-1 N. The percentage of leaf flushing, shoot length, shoot diameter, leaf width and leaf length were non significant. The concentration of 448 mg L-1 N had the highest leaf area and dry leaf weight. The rate of N had no effect on flowering, panicle length and panicle diameter. The concentration of N at 0 mgL(-1)N had the lowest N and highest P concentration in leaf while increasing N decreased P concentration in leaf. The N concentration at 112, 56 and 224 mg L-1 N gave higher value of Ca concentration in leaf than at 0 and 448 mg L-1 N. No treatment had effect on K and Mg concentrations in leaf.