| Experimental research of uniformity in center pivot sprinkler irrigation of alfalfa |
|
View Fulltext View/Add Comment Download reader |
| |
| DOI：10.7606/j.issn.1000-7601.2016.06.15 |
| Key Words: sprinkler irrigation uniformity coefficients drift losses canopy interception alfalfa |
|
| Hits: 1742 |
| Download times: 962 |
| Abstract: |
| In order to increase the uniformity in center pivot sprinkler irrigation of alfalfa and quantatively analyze the main influence factors, carried out the uniformity experiment of center pivot sprinkler irrigation of alfalfa in demonstration area of Angsu Town of Etuoke Banner of Erdos City. Using standard Wilcox-Swailes coefficient method calculated the uniformity coefficients of sprinkler irrigation under different wind condition, and quantitatively researched the influence of sprinkler irrigation to drift losses, the canopy interception losses, total losses of drift and canopy interception and soil water content. The results showed that: The wind speed will be significant influence to uniformity coefficient of sprinkler irrigation. When the average wind speed was 2.57 m·s-1 and 1.53 m·s-1, the uniformity coefficients of sprinkler irrigation were 0.88 and 0.92 respectively, it explained good uniformity of sprinkler irrigation. When the average wind speed was 3.34 m·s-1, the uniformity coefficients of sprinkler irrigation was 0.72, the uniformity was poor. When the sprinkler irrigation quota was 40 mm in research area, the maximal soil infiltration depth was 80 cm. After irrigation the soil water content in 0 to 40 cm depth was significantly increased, the water distribution in this soil layer by new added irrigation volume was accounted for 85% to 95%. The wind speed will be significantly affectetd the drift losses of sprinkler irrigation. The drift loss rate will be significantly increased with wind speed increasing. The impac of wind speed to canopy interception losses was poor than the drift losses, On the contrary the canopy interception loss rate will be lower when the larger wind speed. Even if when the wind speed was rather lower(1.53 m·s-1), the total losses rate of drift and canopy interception of sprinker irrigation was 11.0％ to 15.0％ in Alfalfa branching stage, the losses was too much. |
|
|
|