Chinese fir(Cunninghamia lanceolata) is one of the most important timber tree species in the southern China . However for long period production practice indicated continuous planting on the plot leads to productivity decline and soil degradation. Aluminum toxicity on chinese fir was considered that an important reason why continuous planting on the plot leads to soil degradation. Since the majority of phosphorus in the soil exist in the form of insoluble phosphorus, phosphorus deficiency is an impo...
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