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Effects of applying super absorbent polymer and potassium fertilizer on the yield index and chlorophyll fluorescence parameters of dry land potato.

GAO Tian-peng1**, GUO Rui1, WANG Dong4, GAO Hai-ning2, CHANG Guo-hua1,3, ZHANG Ming1,3, SUN Hai-li1   

  1. (1Centre of Urban Ecology and Environmental Biotechnology, Lanzhou City University, Lanzhou 730070, China; 2School of Life Sciences; Hexi University, Zhangye 734000, Gansu, China; 3School of Chemistry and Environmental Sciences; Lanzhou City University, Lanzhou 730070, China; 4School of Life Sciences, Lanzhou University, Lanzhou 730000, China)
  • Online:2013-05-10 Published:2013-05-10

Abstract: Taking the potato cultivar Longshu-3 as the object, this paper studied the tuber yield and chlorophyll fluorescence parameters under effects of different applications of super absorbent polymer and potassium fertilizer, aimed to approach the effects of applying super absorbent polymer and potassium fertilizer on the yield index and chlorophyll fluorescence parameters of dry land potato from the viewpoint of photosynthetic efficiency. Four treatments were installed, i.e., 0.5% of super absorbent polymer + 60 g·hm-2 of potassium fertilizer (C1), 60 g·hm-2 of potassium fertilizer (C2), 0.5% of absorbent polymer (C3), and no super absorbent polymer + no potassium fertilizer (CK). As compared with CK, the emergence percentage in treatment C1 increased significantly by 9.4%. The crown and stem diameter in treatments C1, C2, and C3 were all higher than those in CK, and, except the NPQ in treatment C3 being lower than that in CK, the mean diurnal Fv/Fm,(Fm′-Fo′)/Fm′,qP, and ETR in treatments C1, C2, and C3 werealso increased to some extent. The yield index was the highest in C1. All the results indicated that super absorbent polymer and potassium fertilizer had direct effects on the potato plant chlorophyll fluorescence parameters, manifesting in the increase of photosynthetic efficiency, and thus, improved the tuber yield of upland potato.

Key words: livestock and poultry industry, manure nutrient, nitrogen, phosphorus, spatiotemporal variability, environmental risk.