Point out problem and deficiency existing in this research, the prospect and imagination of follow-up study.
指出本研究中存在的问题与不足，以及后续研究的展望与设想。
Phosphorus deficiency, which seriously limits yields and distribution of crops, is a problem extensively existing in soils around the globe.
土壤缺磷是世界范围内普遍存在的问题，它严重限制了作物的产量及分布。
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