Abstract
Rice cultivation requires large quantities of irrigation water and mineral fertilizers. This provides an opportunity for the recycling of the plant nutrients in anaerobically digested pig slurry, large amounts of which are generated in Chinese pig farms. Hence, to promote the sustainable development of livestock and poultry breeding and rice production, a micro-plot field experiment was carried out to assess whether or not slurry can replace mineral fertilizers in rice paddy production in terms of plant tillering, grain quality, and yields. The results indicate that the total N content of the slurry can serve as an alternative source of N when compared to the control (450 kg ha−1 commercial compound fertilizer (N/P2O5/K2O = 15:15:15) as basal fertilizer, 300 kg ha−1 urea (N% = 46), and 150 kg ha−1 commercial compound fertilizer as top-dressed fertilizer). No negative effects on plant growth or grain yield were observed, although there may be a potential risk due to an increase in grain Cu concentration. The amylose content and gel consistency of the rice grains were enhanced significantly by the use of slurry as a basal fertilizer, but the grain protein and total amino acid contents decreased. The results suggest that anaerobically digested pig slurry can replace mineral fertilizers in rice production when applied as a basal dressing together with urea and commercial compound fertilizer as top-dressed fertilizers.
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The work was financially supported by Zhejiang Provincial Science and Technology Innovation Team Project (No. 2013TD12-12), Zhejiang Environmental Protection Scientific Research Program (No.2011B21), Zhejiang Provincial Public Techniques Research and Social Development Project (No. 2012C23058), and the National Natural Science Foundation of China (NSFC, No. 41201229). And, the authors would like to thank the anonymous reviewers and the editors for their comments to improve the paper.
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Zhang, J., Wang, M., Cao, Y. et al. Replacement of mineral fertilizers with anaerobically digested pig slurry in paddy fields: assessment of plant growth and grain quality. Environ Sci Pollut Res 24, 8916–8923 (2017). https://doi.org/10.1007/s11356-015-5125-z
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DOI: https://doi.org/10.1007/s11356-015-5125-z