代换性养分(exchangeable nutrient) 水溶性养分(water soluble nutrient) 溶解在土壤溶液中的养分，作物可以直接吸收利用，这种养分对作物是高度有效的。
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water soluble rice nutrient 水溶性稻米营养素
The first cut herbage were selected to study the effect of different harvest time and drying methods on the content of nutrient as water soluble carbohydrate (WSC).
研究了不同刈割期和干燥方法对第一茬牧草水溶性碳水化合物(wsc)等营养成分的影响。
Water-soluble nutrient concentrations in runoff of phosphorus, potassium and bromine ions in the beginning minutes of runoff, runoff in high concentrations, followed by rapid decay.
径流中养分浓度水溶性磷、钾离子和溴离子在开始产流几分钟内，径流浓度很高，随后迅速衰减。
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