Effects of film mulching on photosynthetic characteristics and yield of potato in hilly area of Southern Ningxia
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DOI:10.7606/j.issn.1000-7601.2019.04.28
Key Words: film mulching  potato  photosynthetic fluorescence parameters  yield  black film  white film
Author NameAffiliation
WU Jia-rui College of Agriculture, Ningxia University, Yinchua, Ningxia 750021 
KANG Jian-hong College of Agriculture, Ningxia University, Yinchua, Ningxia 750021 
WU Na College of Agriculture, Ningxia University, Yinchua, Ningxia 750021 
LU Xing-li College of Agriculture, Ningxia University, Yinchua, Ningxia 750021 
MU Yu College of Agriculture, Ningxia University, Yinchua, Ningxia 750021 
SUN Jian-bo College of Agriculture, Ningxia University, Yinchua, Ningxia 750021 
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Abstract:
      In order to study the effects of different mulching materials on the photosynthetic characteristics and yield of potato in dry lands of Ningxia, the study used Qingshu No.9 as the experimental material with single-factor randomized block field experiment. In contrast to no coverage, the effects of black and white film covering on photosynthetic characteristics, fluorescence parameters, dry matter accumulation, and yield of potato were investigated.The results showed thatcovered conditionsincreased the net photosynthetic rate of potato by 0.4%~3.0%, the stomatal conductance and the intercellular CO2 concentration increased by an average of 31.45% and 6.58%, and the Fv/Fm, Fv/Fo, and PI significantly increased by 2.47%, 12.18%, and 20.93%, respectively, compared with the control. Under the condition of film covering, the transpiration rate was significantly reduced by 20.82% in the pre-harvest potato, and increased by 8.55% in the later period over the control. The heat dissipation quantum ratio (Fo/Fm) was 7.11%lower than that of the control. Compared with the non-mulching treatment, the dry matter accumulation of potato increased by 0.25%~1.86%, the rate of large and medium potato increased by 33.78%, 15.73%, and the yield per hectare increased by 43.08% under the condition of film mulching.Among them, the black film treatment index was better than the white film, and the yield of the black film was significantly higher than that of the white film and the control by 16.86% and 54.20%, respectively.Therefore, the film treatment can significantly improve the photosynthetic performance, fluorescence parameters, and yield of potato, effectively alleviate the potato senescence caused by adversity such as drought, thus reducing the harm of drought to potato. In the hilly area of southern Ningxia, the use of black mulching techniques for potato cultivation can delay leaf senescence and increase yield.
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