We can see from the valuation of nutrient balance that the nutrient of revenue and expenditure of each region was nitrogen and phosphorus were surplus, potassium was deficit.

养分平衡评价可以看出各试区养分收支情况为氮磷是有盈余的，而钾处于亏缺状态。

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Of the three approaches, methods 1 and 3, using currency shares and empirics respectively to adjust for currency valuation effects, result in robust relationships between changes in currency-adjusted FX reserves and the BOP surplus, whereas method 2 using forex purchases as an alternative proxy for adjusted FX reserves is inferior.

FORBES: How Much Longer Can China Accumulate Reserves?