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Field studies on the value of organomineral fertilisers as amendments for perennial ryegrass (Lolium perenne L)

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  131620220,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: 10.13031/aim.20131620220) @2013
Authors:   Diogenes Luis Antille, Ruben Sakrabani, Richard J. Godwin
Keywords:   Urea, biosolids granules, organomineral fertilisers (OMF), ryegrass, Olsen’s P, soil P Index.

Abstract. A field-scale trial was established to investigate the agronomic efficiency of novel organomineral fertilisers (OMF) produced from nutrient-enriched sludge granules. Two OMF formulations were tested: OMF15 (15:4:4) and OMF10 (10:4:4) which were compared with urea and biosolids granules applied to a grass crop over a period of two years. The fertilisers were applied at N rates in the range of 0 (control) to 250 kg ha-1 at regular increments of 50 kg ha-1. Results showed that the calculated agronomic efficiencies with OMF were in the range of 25 to 35 kg kg-1 which were approximately double than those of biosolids and comparable to those obtained with urea (range of 30 to 37 kg kg-1). Olsen’s P in OMF-treated soil did not show significant changes (P>0.05); therefore, soil P Index was not affected. This result supported the reasons for the proposed OMF formulations and demonstrated the advantage of the products compared with biosolids which resulted in significant (P<0.05) increases in Olsen’s P. It was also demonstrated that the application of OMF at rates equivalent to the optimum N rate for the grass-soil system should not induce significant changes in soil P Index in the longer-term including application to soils with already satisfactory P levels. Fertiliser application strategies (N rates and timing of OMF application) are discussed which will enhance agronomic and environmental performance.

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