نبذة مختصرة : Sitka spruce seedlings were grown with divided root systems in sand culture and the application of N, P, and K was varied while maintaining a complete supply of other nutrients. There was a localized stimulation of the growth of roots to which nutrients were applied and N produced the greatest stimulation; P was also important but K did not enhance growth. Measurements of Ca and Mg concentrations in the roots showed that differential root growth, which is influenced by the concentration of N and P in the bathing medium, could not be adequately explained by the effect of N or P on the uptake of the immobile cations. The two parts of the divided root system appeared to compete for assimilates; the enhanced growth of one root was accompanied by reduced growth in the other, and vice versa .
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