4Quinlan J D.Chemical composition of developing and shed fruits of Laxton's fortune apples.Journal of Horticultural Science,1969(44): 97-106.
5Whittinghill K A,Hobbie S E.Effects of pH and calcium on soil organic matter dynamics in Alaskan tundra.Biogeochemistry,2012 (111): 569-581.
6Wuddivira M N,Camps-Roach G.Effects of organic matter and calcium on soil structural stability.European Journal of Soil Science,2007,3(58): 722-727.
7Behera S K,Shukla A K.Spatial distribution of surface soil acidity,electrical conductivity,soil organic carbon content and exchangeable potassium,calcium and magnesium in some cropped acid soils of india.Land Degradation & Development,2015.26(1): 71-79.
8Cocucci M,Mignani Z M.A possible relationship between bitter pit and membrane transport in apples.Acta Horticultruae,1983,138: 43-50.
9Li W L,Xu F L,Chen S X,Zhang Z N,Zhao Y,Jin Y K,Li M J,Zhu Y,Liu Y X,Yang Y,Deng X.A comparative study on Ca content and distribution in two Gesneriaceae species reveals distinctive mechanisms to cope with high rhizospheric soluble calcium.Frontiers in Plant Science.2014,5: 14.