Effects of hydrochar application on the dynamics of soluble nitrogen in soils and on plant availability

Journal of Plant Nutrition and Soil Science - Tập 177 Số 1 - Trang 48-58 - 2014
Inge Bargmann1, Matthias C. Rillig1, Andrea Kruse2,3, Jörg‐Michael Greef4, Martin Kücke4
1Freie Universität Berlin, Institute of Biology, Plant Ecology, Altensteinstraße 6, 14195 Berlin, Germany
2Karlsruhe Institute of Technology (KIT), Institute for Catalysis Research and Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
3University Hohenheim, Institute of Agricultural Engineering, Conversion Technology and Life Cycle Assessment of Renewable Resources, Garbenstraße 9, 70599 Stuttgart, Germany
4Julius Kühn-Institut, Institute of Crop and Soil Science, Bundesallee 50, 38116 Braunschweig, Germany

Tóm tắt

AbstractBefore hydrochars can be applied as soil amendments in agriculture, information about how hydrochar application affects soil nutrient cycles and plant growth are necessary. In this study, incubation experiments were performed to investigate hydrochar effects on N concentrations (NO$ _3^- $, NH$ _4^+ $) in soils with different N pools (soil N, fertilizer N). A set of pot trials with three crop species (barley, phaseolus bean, leek) was conducted to determine hydrochar effects on plant N availability and biomass production after mineral‐N fertilization. Results of the incubation experiments show that hydrochar reduced the concentration of mineral N in soil within the first week after incorporation, especially that of nitrate. This was particularly evident, when hydrochars with high C : N ratio, high DOC and low mineral‐N contents were applied. Hydrochars promoted biomass production of barley and phaseolus bean in pot trials, which can be partly attributed to an increase in soil pH after hydrochar incorporation. Dry‐matter yield of leek tended to decrease after hydrochar application. Hydrochars with high C : N ratio decreased the plant's N content, an effect that was strongest with increased hydrochar concentration. Hydrochars with low C : N ratio did not affect the crop's N uptake. Our results show that the use of hydrochars as amendment in arable field or horticultural pot production will require an adjustment of N‐mineral‐fertilization strategies.

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Journal of Plant Nutrition and Soil Science

Tập 177 Số 1

48-58

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