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时针式喷灌机最大的问题是蒸发损失较为严重,灌水不均匀。如美国新墨西哥州,俄克拉何马州,以及西南其他一些州,喷灌蒸发损失都较严重,当白天风速10英里/时,蒸发损失10～15％,当风速为20英里/时,蒸发损失迅速增加到30％或更多。于是美国得克萨斯州农业试验站的灌溉专业人员,结合畦沟蓄水,在时针式喷灌机的管道上,开了一系列出水口,每口间距1～2米,并装有管径19毫米的聚氯乙烯竖管,离地面0.3～0.46米。管道出水口装有大小不同的量水孔,以便每平方米地面所灌的水量都一
The biggest problem of the hourglass sprinkler is the evaporation loss is more serious, uneven irrigation. For example, in New Mexico, Oklahoma, and other South West states, sprinkler evaporation losses are more severe, with evaporative losses of 10-15% at day 10 mph and evaporative losses rapidly at 20 mph Increase to 30% or more. As a result, Irrigation professionals at the Texas Agricultural Experiment Station in the United States, in conjunction with the Suo ditch water storage, opened a series of outlets on the pipe of the hour-light irrigation machine, each with a distance of 1 to 2 meters and a 19-mm diameter PVC standpipe, 0.3 ~ 0.46 meters above the ground. Pipe outlet equipped with different sizes of water holes, so that every square meter of water on the ground is a