Effects of Supplying Phosphorus on Growth and Nutrient Status of Mytilaria laosensis Seedlings

Abstract:

In order to understand the effect of supplying phosphorus (P) on growth and nutrient status of Mytilaria laosensis, its growth character, nutrient content and accumulation, and uptake efficiency of P were studied treated with different P levels under soil culture. The results showed that with the supplying P increment, the plant height, biomass, and nutrient accumulation increased initially and then decreased, and the base diameter rose firstly and then kept stable. As supplying P levels increased, the changes in nutrient content of leaves and whole plant were not different, nitrogen (N) content had no obvious change, the content of potassium (K) decreased firstly and then increased, while the P content obviously enhanced, the uptake efficiency of P showed the trend of drop-rise-drop. Supplied with 30 mg P per plant, the biomass of leaves and root, the N accumulation in leaves and uptake efficiency of P were the highest. The plant height, biomass of stem, total biomass, K and P accumulation in leaves, N, P and K accumulation in the plant reached peak supplied 45 mg P per plant. As supplied 60 mg P per plant, the plant height, biomass, nutrient accumulation and uptake efficiency of P declined significantly. Therefore, the optimum supplying P level for plant growth of M. laosensis seedlings was 30-45 mg per plant, and beyond that, some obvious inhibitory effects would occur.

Key words:Mytilaria laosensis;Phosphorus;Growth;Nutrient status