P fertilization increased N, P and K accumulation in tree biomass and nutrient use efficiency in wood and biomass production.

施P肥还增加了树木N、P和K的养分积累量，提高了上述养分的利用效率。

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The H-N ratio in the production of synthetic ammonia is one of the most important parameters to increase the product yield which is an efficiency measure to keep the optimal production.

氢氮比是合成氨装置最为关键的参数之一，保持比值始终处于最佳状态是提高合成氨产量的有效措施。

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