[Study on balanced application of NPK fertilizer on growth of Paeonia lactiflora with orthogonal design]

To study the level of NPK balanced fertilization on growth of Paeonia lactiflora in different growing periods.

This experiment was designed as orthogonal test of three factors and three levels. Fresh weight of root, number of bud, number of root division, length of the longest root and diameter of widest root were used as indicators.

Nitrogenous, phoshate and potash fertilizer affected the growth of the Paeonia lactiflora from the first to the third year. And the nitrogenous was the main factor during the fourth year.

NPK fertilizer, especially N and P fertilizer are needed during the first year of the Paeonia lactiflora. Only the nitrogenous fertilizer is needed in the fourth year.