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Nutrient supply from organic amendments applied to unvegetated soil, lettuce and orchardgrass

Hammermeister, A.M.; Astatkie, T.; Jeliazkova, E.A.; Warman, P.R. and Martin, R.C. (2006) Nutrient supply from organic amendments applied to unvegetated soil, lettuce and orchardgrass. Can. J. Soil Sci., 86, pp. 21-33.

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Online at: http://pubs.aic.ca/doi/pdf/10.4141/S05-021

Summary

Organic sources of nutrients are increasingly being used in horticultural and certified organic production. The nutrient-supplying potentials of poultry manure compost (PM), feather meal (FM), alfalfa meal (AA) and vermicastings (VC) and an unamended control were measured in a growth room experiment. The amendments were applied at rates equivalent to 200, 400 and 800 kg total N ha-1 to a soil of low fertility. Nitrogen supply rates and concentrations were measured over 6 mo in unvegetated pots using PRS™ probes and KCl extraction, respectively. Biomass of lettuce (Lactuca sativa L.) and orchardgrass (Dactylis glomerata L.) and N uptake of orchardgrass were measured. Repeated measures analysis revealed significant amendment × rate × time interaction effects for N supply rate and concentration. Of total N applied, available N was 50 to 70% in the FM and PM treatments, 10 to 40% in the AA treatments, and 10% in the VC treatments. High rates of FM and PM were toxic to lettuce but produced good orchardgrass yields. VC was safe for lettuce but low N availability limited long-term orchardgrass growth. Higher application rates did not result in corresponding increases in nutrient supply. Consideration should be given to balancing the ratio of available nutrients in amendments with plant requirements.


EPrint Type:Journal paper
Keywords:Apparent nitrogen recovery, plant N uptake, feather meal, alfalfa meal, vermicastings, poultry manure compost
Subjects: Soil > Nutrient turnover
Soil
Research affiliation: Canada > Nova Scotia Agricultural College
ISSN:0008-4271
DOI:10.4141/S05-021
Deposited By: Hammermeister, Dr. Andrew
ID Code:19295
Deposited On:17 Aug 2011 07:07
Last Modified:17 Aug 2011 07:07
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted
Additional Publishing Information:ISSN (electronic): 1918-1841

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