Effects of Regulated Drip Irrigation at Different Growth Stages on Yield, Quality and Water Use Efficiency of Potato in Oasis Region

doi:10.7668/hbnxb.201751588

Abstract

Abstract: In order to explore the effects of irrigation treatments at different growth stages on the growth dynamics, water consumption characteristics, quality, yield and water use efficiency of potato in Hexi Oasis, a field experiment was carried out, taking Qingshu 168 as the material and setting up two irrigation treatments:mild and moderate water deficits. The plant height, leaf area, yield and tuber organic matter content of potato were determined. The results showed that the yield of potato treated with mild water deficit in tuber forming period did not decrease significantly compared with CK, while the water use efficiency, commercial potato rate and bunched potato proportion increased by 22.07%, 10.09 percentage point and 8.20 percentage point respectively, and the dry matter, starch, protein and reducing sugar of potato tubers did not significantly reduced.The mild (WD5) and moderate (WD6) water deficits at tuber bulking stage reduced the potato yield by 15.77% and 18.93% respectively, reaching to a 0.05 significant level, and they were not beneficial to organic matter accumulation of potato tubers and decreased the contents of dry matter, protein and reducing sugar in potato tubers by 1.62 percentage point and 3.38 percentage point, 28.50% and 24.35%, and 34.38% and 46.88%, respectively. The mild (WD7) and moderate (WD8) water deficits at starch accumulation stage had less effect on yield, however, WD7 treatment increased the commercial tuber rate, protein content and reducing sugar content by 8.61 percentage point, 3.11% and 15.63% respectively, while the water use efficiency was not improved significantly. Therefore, in pursuit of higher yield and water use efficiency of potato, mild water deficit treatment at tuber formation stage is the best irrigation strategy in this experiment, but for seeking higher quality of potato, mild water treatment in starch accumulation period is the best.

Key words: Potato, Moisture treatments, Mulched drip irrigation, Yield, Quality

CLC Number:

S274.1

ZHANG Wanheng, ZHANG Hengjia, LI Fuqiang, WANG Zeyi, GAO Jia, BA Yuchun. Effects of Regulated Drip Irrigation at Different Growth Stages on Yield, Quality and Water Use Efficiency of Potato in Oasis Region[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2019, 34(5): 145-152. doi: 10.7668/hbnxb.201751588.

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