Nutrition Studies on Eucalyptus II. N, P, K, Requirements of Eucalyptus Hybrid Seedlings

The paper describes the results of an investigation on nitrogen, phospborus and potassium requirements of Eucalyptus hybrid seedlings. The seedlings were grown in pots and supplied with 5 doses of N, P and K equivalent to 0, 100, 200, 300 aad 400 Iba./acre in all combinations. The seedlings showed marked deficiency symptomsin the absence or in some cases at lower levels of N and P. Survival of the plants is decreased with the increase in the dose of N while reverse is true with the increase in the dose of P, K has no significant effect on the survival of the plants. It was found that N and P each had significant effect on the growth of the plants, while reverse is true in the case of K. Interaction of these nutrients is not significant. As regards the uptake and interaction of the nutrients, the results indicate that the supply of K has synergistic effect on the accumulation of nitrogen while varying levels of N appear to show no specific trend in the uptake of K. Phosphorus uptake is not affected by the supply of N and K. The studies clearly indicate that N and P nutrients are of great importance in the growth of this species.