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Pre-incubation in soil improves the nitrogen fertiliser value of hair waste

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Abstract

Global generation of human hair waste and its disposal at landfills could contribute to the leaching of nitrates into ground water. High concentrations of nitrogen (N) and other elements suggest that the waste could be a source of plant nutrients and differences in ethnic hair types could affect nutrient release and fertiliser value. The objective of this study was to determine the effects of hair type, as an N source, and pre-incubation time on dry-matter yield, nutrient uptake by spinach (Spinacia oleracea L.) and residual soil nutrients. Salons in Pietermaritzburg provided bulk African and Caucasian hair waste, without distinguishing age, sex, health status or livelihood of the individuals. The hair waste was analysed for elemental composition. A pot experiment was set up under glasshouse conditions. The hair waste was incorporated (400 kg N ha−1) into a loamy oxisol and pre-incubated for 0, 28, 56 and 84 days before planting spinach. Potassium (K) and phosphorus (P) were corrected to the same level for all treatments. Spinach seedlings were then cultivated for 6 weeks. Shoot dry-matter and the uptake of all nutrients, except P, were increased by the pre-incubation of hair. African hair pre-incubated for 28 days resulted in greater dry-matter, N, K, Mn and S uptake than Caucasian hair. Increasing pre-incubation resulted in a decline in the residual soil pH and exchangeable K. The findings suggested that pre-incubation improves the N fertiliser value of hair and that African hair has greater value than Caucasian hair when pre-incubated for a short period.

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Funding

The National Research Foundation (NRF), through a rated researcher incentive (GUN95948), funded the research.

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  1. School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal, Private Bag X01, Scottsville, 3209, South Africa

    N. M. Malepfane & P. Muchaonyerwa

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  1. N. M. Malepfane
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  2. P. Muchaonyerwa
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Correspondence to N. M. Malepfane.

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Malepfane, N.M., Muchaonyerwa, P. Pre-incubation in soil improves the nitrogen fertiliser value of hair waste. Environ Monit Assess 190, 94 (2018). https://doi.org/10.1007/s10661-017-6429-x

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  • DOI: https://doi.org/10.1007/s10661-017-6429-x

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