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The effect of bio-compost application on crop yield and nitrogen dynamic in the soil

  • R. Schulz
  • H. Al-Najar
  • J. Breuer
  • V. Römheld
Part of the Developments in Plant and Soil Sciences book series (DPSS, volume 92)

Abstract

Since 1997 bio-compost with and without optimised mineral N fertilisation is applied to maize, winter wheat and summer barley (crop rotation) in a randomised field experiment on a Luvisol in south-west Germany. The aim of this experiment is to evaluate the effect of bio-compost application on crop yield and N-net mineralisation in soil. In the bio-compost application treatment (100 kg total N ha−1 a−1, that is about 7.5 t DM) with optimised mineral N fertilisation yield of summer barley (1999) and maize (2000) was higher than in the optimised mineral N treatment without bio-compost application. Similar results were obtained with the higher bio-compost application rate (400 kg total N ha−1 a−1, that is about 30 t DM) without additional mineral N fertilisation. The yield increase can be attributed to an improvement of soil structure in the Luvisol. During the vegetation period of summer barley net-N-mineralisation on the field plots of the bio-compost treatments with additional mineral N fertilisation was lower than in plots without additional mineral N application. The higher Nmin values after harvest (Sept. 1999) in bio-compost treatments with additional mineral N-fertilisation can be partially attributed to the remineralisation of immobilised N at the end of the growth period.

Key words

bio-compost nitrogen mineralisation nitrogen immobilisation nitrogen dynamic 

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Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • R. Schulz
    • 1
  • H. Al-Najar
    • 1
  • J. Breuer
    • 2
  • V. Römheld
    • 1
  1. 1.Institute of Plant Nutrition (330)University of HohenheimStuttgartGermany
  2. 2.Institute of Agricultural Chemistry (710)University of HohenheimStuttgartGermany

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