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生长在美国东南部低海岸平地排水不畅立地上的火炬松(Pinus taeda L.),在造林时施磷(P)常常显示出惊人的持久的生长反应(Gent等,1986)。虽然许多火炬松人工林对单独施磷的反应能持续整个轮伐期,但在造林时施氮N+P,还可从再一次施P中获益,持续地提高生长量,而在轮伐期中期单独施N肥,常导致迅速又短暂的生长反应,还可能引起P应力。通常根据诊断检验的结果决定是单独施P,还是与N结合施P。
Pinus taeda L., which grew poorly drained on the lower coast of the southeastern United States, often shows a surprisingly long-lasting growth response during afforestation (Gent et al., 1986). Although many Pinus taeda plantation responses to phosphorus alone can last for the entire rotation period, applying N + P at the site of afforestation can also benefit from further application of P to sustainably increase growth, whereas on rotation N fertilizer alone in mid-term, often leads to rapid and transient growth response, but also may cause P stress. Usually based on the results of diagnostic tests to decide whether P alone, or combined with N application of P.