| Water consumption characteristics and growth dynamics of potato under mulched drip irrigation with soil water deficit regulation |
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| DOI：10.7606/j.issn.1000-7601.2017.03.13 |
| Key Words: water deficit mulched drip irrigation potato water consumption growth indexes |
| Author Name | Affiliation | | LI Jing | Department of Agricultural Water Resources Engineering, School of Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHANG Heng-jia | Department of Agricultural Water Resources Engineering, School of Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHOU Hong | Department of Agricultural Water Resources Engineering, School of Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| An experiment was conducted to determine the effect of water deficit on soil moisture, water consumption, growth, and tuber yield of potato under mulched drip irrigation in Hexi oasis region, with “Qingshu No.168” selected as the experimental cultivar. There were mild (55%～65% of field capacity，FC) and medium water deficit (45%～55%FC) at both tuber initiation and tuber bulking stages, mild water deficit at tuber starch accumulation stage, resulting in five water deficit treatments. The non-soil-water-deficit (65％～75％FC) was taken as control. Results indicated that soil water content varied more in 0～40 cm than 40～60 cm soil layer. The stored soil water for the mild and medium deficit at potato tuber bulking was 8.1％ and 18.7％ lower than that for full irrigation(P＜0.05), and the daily water consumption decreased by 60.0％ and 73.0% respectively. The leaf area index (LAI), leaf area duration (LAD), and relative growth rate (RGR) of potato were compensatory increased by re-watering after various water deficit at tuber initiation, while the LAI, LAD, and RGR decreased in the plants subjected to mild and medium water deficit at tuber bulking and mild deficit at starch accumulation, with tuber yield reduced by 22.3%, 26.5%, and 38.7% compared with that of full irrigation. Therefore, green leaf area should be maintained by sufficient water supply at late growth stages of potato, which is beneficial to tuber yield. |
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