水稻营养品质改良
rice nutritive quality improvement
水溶性稻米营养素
water soluble rice nutrient
不同营养水平
Undernutrition
different nutrient level
different nutritional condition
城市污水营养物
urban waste-water nutrient
大型贫营养水库
large oligotrophic reservoir
地表水营养物质
nutrients in surface water
碘营养水平
Iodine nutritional status
Iodine nutrition level