Responses of Potato Leaf and Soil Water Potential to Furrow-Ridge and Film-mulching Treatments in the Rain-fed Region of Loess Plateau
Experiment was conducted in the semi-arid rain-fed region of Loess Plateau,where rain-fed agriculture occupies a very important position and water is the main limitation in these areas.In this paper,we explored responses of potato leaf and soil water potential to furrow-ridge and film-mulching treatments.The results showed that potato planted by furrow and ridges with film mulched had a significant impact on leaf and soil water potential.In different soil layers,the diurnal variation pattern of soil water potential was different at different growth stages.In 0-20 cm soil layer,the diurnal variation pattern of soil potential of potato by the treatment of soil ridge (NM) at the stage of anthesis,the diurnal variation pattern of soil potential of potato by the treatment of soil ridge with plastic-covered (M) at tuber expansion period,the diurnal variation pattern of soil potential of potato by the treatments of plastic-covered ridge (M) and double-ridge with film covered (DR) at maturity were going down at first,and then going up at late afternoon,the diurnal variation of other treatments were going down gradually.In 20-40 cm soil layer,the diurnal variations patterns of soil potential of potatoes by all treatments were going down gradually.The diurnal variation patterns of leaf water potential had two different styles:double trough type and single trough type.All treatments were of the same trend.At the stages of anthesis and tuber expansion period,the diurnal variation patterns of leaf water potential were double trough type and the troughs occurred at about 13:00 and 17:00.At maturity stage,the diurnal variation pattern of leaf potential was single trough type and the trough occurred at about 17:00.The trend of soil and leaf water potential was decreased firstly and then increased with the growth periods.The 20-40 cm soil layer was the most important soil layer to leaf water potential.In this soil layer,soil ridge has kept soil under the soil ridge having the best moisture status,leading to leaf water potential of such a treatment being the highest.If the precipitation before the maturity stage is very small,potato planted by the treatment of NM will bear less soil water stress as a result of smaller transpiration rate.If the precipitation before the maturity stage is sufficient,potato planted by the treatment of M and DR can rich larger harvest relying on their greater transpiration rate.
soil water potentialleaf water potentialpotatofurrow and ridgesmulching
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NSTL
万方数据
维普
