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Waste composts as nitrogen fertilizers for forage leys

Tontti, Tiina; Nykänen, Arja and Kuisma, Miia (2009) Waste composts as nitrogen fertilizers for forage leys. Agricultural and Food Science, 18 (1), pp. 57-75.

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Summary

Two field experiments, conventional grass ley and organic grass-clover ley, were established with barley as a nurse crop in spring 2000 and given either low or high fertilization with mineral fertilizer (Mineral) or composts. The compost types were municipal biowaste (Biowaste), biowaste + sewage sludge (BioSludge) and cattle manure (Manure). Plant yields and nitrogen (N) uptakes were measured for three years and efficiency of N utilization was estimated. In single application of compost, the total N was mainly in organic form and less than 10% was in inorganic form. Along with increasing amount of inorganic N applied in compost, the yield, N uptake and N recovery increased during the application year. The highest compost N recovery in the application year was 12%, found with Biowaste. In the following years the highest N recovery was found where the lowest total N had been applied. Clover performance was improved in the organic grass-clover ley established with BioSludge fertilization, producing total ley yield comparable with Manure compost. High total N application in composts caused high N surplus and low N use efficiency over three years. Generally, moderate compost fertilization is suitable for ley crops when supplemented with mineral N fertilizer or clover N fixation.


EPrint Type:Journal paper
Keywords:compost, biowaste, sewage sludge, yield, nitrogen
Subjects: Soil > Nutrient turnover
Research affiliation: Finland > MTT Agrifood Research
ISSN:1795-1895
Related Links:http://www.mtt.fi/english
Deposited By: Koistinen, Riitta
ID Code:16627
Deposited On:04 Jan 2010 13:18
Last Modified:12 Apr 2010 07:42
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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