试验结果表明，土壤缺钾是该试验的主要养分限制因子之一；
The potash deficiency in soil is proved the restricting factor in this experiment.
密植对土壤养分环境的压力，造成多因子、多梯度的养分限制因子；
The high density planting affecting soil nutrinent environment causes nutrinent limitation from many factors and many stairs.
采用土壤养分状况系统研究法。在摸清土壤养分限制因子前提下，平衡施肥。
By using soil nutrient state system study method, balancing soil fertilization have been adopted after the soil nutrient limitation factors had been made clear.
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