低容量和超低容量喷雾所用的喷洒药液浓度很高，而每亩喷洒药液的量很少，施药后药剂在作物表面上不是以液膜的形式覆盖，而是以雾滴覆盖，雾滴与雾滴之间有一定的距离，这种在单位面积上沉积的雾滴数量，就叫做雾滴覆盖密度，常以作物表面上每平方厘米覆盖多少个雾滴来表示。
由试验得出，喷头前方的雾滴覆盖率和当量直径较大，而沉积密度的最大值出现在喷头前方较远处。
The results of the experiments showed that the droplets deposition and diameter were bigger and the maximum of the droplets deposition appears far from the front of the nozzles.
在喷雾试验中主要以雾滴在作物上的覆盖密度、雾滴均匀程度和施药量为标准。
Test the spray droplet main crops in the coverage density, and uniformity of droplet spray volume as the standard.
棚室内距地面高度0.4 ~ 0.8 m范围内，雾滴的覆盖率和沉积密度基本不随高度变化。
The spraying coverage and droplets density would not change at the height of 0.4 ~ 0.8m on the ground.
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