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Fertilizer value and nitrogen transfer efficiencies with clover-grass ley biomass based fertilizers

Benke, Anna Pia; Rieps, Ann; Wollmann, Iris; Petrova, Ioana; Zikeli, Sabine and Möller, Kurt (2017) Fertilizer value and nitrogen transfer efficiencies with clover-grass ley biomass based fertilizers. Nutrient Cycling in Agroecosystems, 107, pp. 395-411.

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Document available online at: https://link.springer.com/article/10.1007/s10705-017-9844-z


Summary

In temperate regions, legume-based green manures are a key element of organic rotations.
However, specialized farms lack sufficient mobile organic fertilizers. To gain a better understanding of the N flows and the nitrogen (N) and phosphorus (P) fertilizer value of different clover-grass-based fertilizers (biogas digestate, compost, silage and fresh clover-grass obtained from clover grass ley biomass), we assessed their fertilizer value. Nitrogen and P offtake by the ryegrass was used to assess the shortterm effects. The data were completed using model calculations to assess the field-to-field N-transfer efficiencies and the overall N-transfer efficiencies.
The greatest plant N offtake was achieved with digestates (64%) and the lowest from the compost (6%) and solid farmyard manure (14%). The mineralization rate was positively related to the NH4+– N/total N ratio (P\0.01, r2 = 0.82). The model calculations indicate that the overall short-term N-transfer efficiencies are driven by the field to-field N-transfer efficiency and the field-to-crop transfer efficiency. However, in the long term, model calculations indicate that a high field-to-field N-transfer efficiency is the key strategic approach when aiming to achieve cropping systems with a high overall longterm N-transfer efficiency. Consequently, the results showed that aerobic decomposition (composting) significantly lowered field-to-field as well as field-tocrop N-transfer rates. The relative P use efficiency strongly differed among the fertilizers. In particular, freshly cut clover-grass and solid manure increased P availability and led to an increase of plant P offtake that was higher than the amount of P supplied.


EPrint Type:Journal paper
Keywords:Nitrogen, Phosphorus, Composts, Digestates, Biomass silages, Cut and carry, Animal manures, IMPROVE-P, CoreOrganicII
Subjects: Crop husbandry > Composting and manuring
Soil > Nutrient turnover
Research affiliation: European Union > CORE Organic II > IMPROVE-P
Germany > University of Hohenheim > Institute of Crop Science
H2020 or FP7 Grant Agreement Number:249667
Related Links:http://coreorganic2.org/coreorganic2.asp
Deposited By: Möller, PD Dr. Kurt
ID Code:32675
Deposited On:15 Jun 2018 07:39
Last Modified:15 Jun 2018 07:47
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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