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.
- Published Version
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|
|Deposited By:||Koistinen, Riitta|
|Deposited On:||04 Jan 2010 13:18|
|Last Modified:||12 Apr 2010 07:42|
|Refereed:||Peer-reviewed and accepted|
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