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| DOI：10.13522/j.cnki.ggps.2017.11.002 |
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| Effects of Regulated Deficit Drip Irrigation on Growth and Yield of Sugar Beet |
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FENG Zeyang, LI Guolong, LI Zhi, ZHANG Yongfeng, ZHANG Shaoying
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Sugar Beet Physiological Institute, Inner Mongolia Agricultural University, Hohhot 010018, China
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| Abstract: |
| We present the results of a field experiment aimed to elucidate the effects of regulated deficit drip irrigation on growth traits, yield and water use efficiency of sugar beet. The results showed that over the vegetative developmental period, a moderate water deficiency by keeping soil moisture content at 50%～60% of the field capacity had a compensatory effect on leaf area, dry root weight, net photosynthetic rate and transpiration rate after re-wetting, whilea severe water deficiency with soil moisture being 40%～50% of the field capacity had an inhibitory effect on the growth of the plant. It was also found that a deficit irrigation during the root swelling period had less effects on growth and physiological development of the plant than that during the vegetative developmental period. Considering the yield and water use efficiency, it was concluded that an irrigation amount of 1147.78 m3/hm2 over the vegetative development stage and another 635.54 m3/hm2 over the root swelling stage are optimal for deficit irrigation. |
| Key words: drip irrigation; regulated deficit irrigation; sugar beet; water use efficiency; yield |
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