Abstract:

The principle, technique and its application of vector diagnosis were introduced systematically in the paper. The nutrient-limited status, interactions among nutrients and fertilization effect in Eucalyptus grandis plantation in Naxi County, Sichuan, were analyzed here based on the principle and technique of vector diagnosis. The results showed that potassium was the first nutrient-limited factor, phosphorus second one, nitrogen was not limited, and boron was deficient. Moreover, phosphorus fertilizer antagonized the effects of calcium and magnesium fertilizers, but promoted the boron fertilizer effect. On the whole, the fertilization effect would continue for more than three years.

Key words: Eucalyptus grandis, foliar diagnosis, vector diagnosis, nutrient-limited, fertilization effect