Effects of Coupling of Biogas Slurry,Potash and Calcium Fertilizer on Chlorophyll Fluorescence Parameters, Yield and Quality of Cucumber

Different concentration of biogas slurry and potash fertilizer and calcium fertilizer was designed to study their coupling effects on yield,quality,the growth and chlorophyll fluorescence parameters of potted cucumber(Cucumis sativus L.)under mushroom compost dregs cultivation in greenhouse.The results showed that compared with the treatment of the volumetric ratio of biogas slurry and water of 1∶2,the yield,quality and ETR increased with the treatment of the volumetric ratio of biogas slurry and water of 1∶3 in the same dosage of potash fertilizer and calcium fertilizer.However,under the same concentration of biogas slurry,the Vc and protein of fruit were positively correlated with the dosage of potash fertilizer and calcium fertilizer.Summarily,the optimal combination was solution of 0.62g K2SO4 and 4.22g Ca(H2PO4)2 in one liter of primeval biogas slurry and the mixture of the volumetric ratio of biogas slurry and water of 1∶3,compared with CK(Yamazaki cucumber nutrient solution).This treatment improved the content of yield,Vc,soluble sugar of fruit by 32.41%,92.08%,and 6.40%respectively,the nitrate content of fruit decreased by 22.76%,the ETR of leaves increased by 6.02%,and the Fo of leaves decreased by 8.40%.These findings suggested that solution of 0.62g K2SO4 and 4.22g Ca(H2PO4)2 in one liter of volumetric ratio of biogas slurry and water with 1∶3 could have a positive role on cucumber yield and the nutritional quality in mushroom compost dregs cultivation.