Effects of phosphorus supply levels on the growth and nutrient utilization of <i>Pinus massoniana</i> lamb hybrid saplings.

With increasing fertilizer intensity, needle nitrogen and phosphorus content and the nitrogen-to-phosphorus ratio showed an increasing trend ( Figure 4 ), indicates that increased external phosphorus supply promoted uptake of both nitrogen and phosphorus in P. massoniana needle. 3.3 Factor contribution analysis The distribution of all indicators varied across three dimensions: variety (V), fertilization (P), and their interaction (V×P) ( Figure 3B ).

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