Effects of Biogas Slurry Combined with Chemical Fertilizer on Growth and Quality of Potted Cherry Radish
The experiment was conducted to study the effects of biogas slurry combined with chemical fertilizer on plant growth and quality of potted cherry radish,in order to provide a theoretical reference for the rational utilization of biogas slurry and the realization of high quality and high yield of crops.The cherry radish variety of'Astor'imported from Netherlands was used as material,and two factors were set as application method and applying ratio of biogas slurry.The fertilizer application methods included nitrogen base application and base application+top dressing.Nitrogen base application was divided into single application of chemical fertilizer(CF)and biogas slurry(CB).Nitrogen base application+top dressing used biogas slurry combined with chemical fertilizer under the premise of the same amount of nitrogen,and the proportions of nitrogen re-placed by biogas slurry was 25％(25BSF),50％(50BSF),75％(75BSF)and 100％(100BSF).The effects of different application methods of biogas slurry combined with chemical fertilizer on germination rate,germination potential,chloroplast pigment content in leaves,growth and development,and fruit quality of cherry radish were studied with no fertilization(CK)as control.The results were as follows.(1)With the in-crease of biogas slurry application rate,the germination rate of cherry radish seeds showed a trend of first in-creasing and then decreasing,and the germination potential showed a gradually downward trend.The germina-tion rate in 75BSF treatment was the highest,which was 3.57％and 10.56％higher than that in CK and CF treatments,respectively.(2)CB,25BSF,50BSF,75BSF and 100BSF treatments could increase the chloro-plast pigment content in leaves,growth index value,and soluble sugar and Vc contents of cherry radish.With the proportion increase of biogas slurry instead of chemical fertilizer,the value of each index showed a trend of first increasing and then decreasing,among which,the contents of chlorophyll a,chlorophyll b,total chloro-phyll and carotenoids in 75BSF treatment increased by 54.84％,40.63％,50.96％and 48.78％,respectively,compared with CK,and increased by 28.00％,25.00％,27.42％and 29.79％compared with CF treatment,respectively.The cherry radish in 75BSF treatment obtained the highest fleshy root fresh weight,fleshy root dry weight,canopy fresh weight and canopy dry weight,which increased by 89.16％,88.89％,70.37％and 34.29％compared with CK,and increased by 13.72％,27.50％,33.72％and 17.50％compared with CF treat-ment,respectively.The 75BSF treatment was beneficial to the accumulation of soluble sugar and Vc in cherry radish,which increased by 65.76％and 78.53％compared with CK,and increased by 35.22％and 25.14％compared with CF treatment,respectively.Overall,the 75BSF treatment had the best effect on growth promo-tion of cherry radish.In summary,the application of biogas slurry combined with chemical fertilizer could im-prove the growth and development of cherry radish plants and the synthesis of chloroplast pigments effectively,and then promote the improvement of plant biomass and nutritional quality,which was a fertilization strategy to reduce the amount of chemical fertilizer,consume biogas slurry,increase crop yield and improve nutritional quality,so biogas slurry could be used to replace chemical fertilizer nitrogen by 75％.
Biogas slurry combined with chemical fertilizerCherry radishGermination rateChloro-plast pigment contentFruit quality
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