Abstract

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Title:: Effect of Rare Earth Composite Fertilizer on Leaf Photosynthesis and Fruit Quality of Apple

Author(s):: RUAN Fangyi; LI Yuntao; QIU Shuo; HAN Zhenbin; JIANG Zihao; (College of Chemistry and Chemical Engineering,Shaanxi University of Science and Technology,Xi′an,Shaanxi 710021)

Keywords:: rare earth; leaf fertilizer; apple; photosynthesis; fruit quality

Abstract:: The ‘Fuji’ apple was used as material,the effect of rare earth composite fertilizer(0.01,0.10,1.00 mg·L-1) on vegetative growth and photosynthesis of leaves were studied in order to provide reference for the rare earth fertilizer application in apple production.The results showed that when rare earth composite fertilizer with concentration of 0.01,0.10 and 1.00 mg·L-1 were spraying during growth season,the leaf chlorophyll contents,the net photosynthetic rate (Pn),the instantaneous carboxylation efficiency (Pn/Ci),the fast induction curves of chlorophyll fluorescence (OJIP curve) and the photosynthetic performance index (PIABS) were significantly improved.Meanwhile,it could alleviate the effect of photosynthetic midday-depress.Additionally,rare earth composite fertilizer treatment also increased the fruit hardness,soluble solid content,vitamin C content,total sugar content and titratable acid content.As a result,the spraying of rare earth composite fertilizer could significantly increase the leaf chlorophyll content and photosynthetic energy conversion efficiency of leaves,and ultimately improve fruit quality.