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Impact of biogas slurry fertilizer on growth, quality and biochemical characteristics of ornamental lettuce ‘Biscia Rossa’.

Juan Jiaxiang, Muhammad Khalid, Zhao Hong, Yang Leqi, Muhammad Bilal, Gao Zhaoliang, Tang Dongqin and Huang Danfeng

Biogas slurry is a good source of plant nutrients and substituting chemical fertilizers with biogas slurry not only achieve resource utilization of slurry, but also reduce the amount of fertilizer. The present study investigated the influence of different ratios of biogas slurry fertilizer (BSF) on the growth, yield and quality characteristics of ornamental lettuce ‘Biscia Rossa’. Results revealed that BSF significantly (p<0.05) improved the growth of ornamental lettuce on treatment with Z1 fertilizer; the plant height was increased by 12.66% and 16.75%, while leaf area was improved by 19.97% and 42.03%, in comparison with control group. The improvement in yield of ornamental lettuce was noted in varying degrees by BSF. The highest dry and fresh weights were observed in case of Z1 treated lettuce plants. The fresh weight was 33.52%, 44.77%, 43.96% and 49.04% higher than that of other 2 fertilizers and 2 control groups, respectively. Whereas the dry weight was 2.7 and 3.17-times greater than that of two control groups. The biogas slurry irrigation also considerably improved the quality of ornamental lettuce. Moreover, it was observed that vitamin C, anthocyanin, soluble sugar and protein were higher than that of control groups. Contrarily, the BSF led to decrease in nitrate-nitrogen content in ornamental lettuce

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