目前个体从事果树生产的农民喷叶面肥或农药时多采用水桶盛装药液。我国农村水桶容量通常在15kg左右,因此用水桶直接配制药液具有计算简便、省工省时的优点,被各地果农广泛采用。但是在配制植物生长调节剂等低浓度药液时,往往很难保证浓度的准确性。例如:欲配制20×10~(-6)的萘乙酸溶液,需将1g纯度为90％的萘乙酸溶解后用45kg水稀 Currently engaged in the production of fruit trees farmers spray foliar fertilizer or pesticide more bucket filled with liquid medicine. The capacity of rural buckets in China is usually about 15kg, so the direct preparation of liquid buckets with buckets has the advantages of simple calculation, labor-saving and time-saving and is widely adopted by fruit growers all over the country. However, in the preparation of plant growth regulators and other low-concentration liquid, it is often difficult to ensure the accuracy of the concentration. For example: To prepare a 20 × 10 -6 naphthalene acetic acid solution, to be 1g purity of 90% naphthalene acetic acid dissolved with 45kg water diluted