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Initial and subsequent effects of hydrochar amendment on germination and nitrogen uptake of spring barley

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The application of hydrochars as soil amendments could be an option to ameliorate soil quality
by enhancing nutrient and water-holding capacity of sandy soils. But when hydrochar application
is directly followed by sowing, it can decrease the soil mineral-N concentration and the germination
rate of crops. We currently lack evidence, whether these effects are persistent or transient
and thus can be avoided by adjusting the application strategy, e.g., by prolonging the period between
application and sowing. A set of pot trials with spring barley (Hordeum vulgare L.) was
performed to study the initial and subsequent effects of different hydrochar amendments on germination,
biomass production, and plant N availability. To this end, two subsequent cultivations
of barley were grown on hydrochar-amended soil–peat substrates. The first barley cultivation
was sown directly after hydrochar application. After the harvest, the same substrates were cultivated
with barley again. Germination, biomass production, and N concentration in the biomass
were reduced when sowing directly followed the application of hydrochars. Differences in germination
rate and biomass production between hydrochar treatments depended on the hydrochar
feedstock. A recultivation of the hydrochar-amended substrates 9 weeks after hydrochar application
showed no significant effects on germination and biomass production. The N concentration
in plants was still lower in the hydrochar treatments despite additional fertilization. The N
immobilized during the first cultivation period was not released in the following weeks. We conclude
that the germination-inhibiting substances in hydrochars were removed in the weeks after
soil incorporation. This is probably due to microbial degradation of hydrochar components and a
consecutive immobilization of mineral N. Hydrochar amendment had only short-term effects on
germination and biomass production of barley that can be avoided by applying hydrochar at
least 4 weeks prior to sowing. The N concentration in plants was persistently low even 4 months
after hydrochar application which can only be redeemed by adjusting the fertilization strategy.

Key words: hydrothermal carbonization / germination inhibition / nitrogen immobilization /
nitrogen availability

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Informasi Detail

Judul Seri

J. Plant Nutr. Soil Sci.

No. Panggil

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Penerbit

: WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim., 2014

Deskripsi Fisik

J. Plant Nutr. Soil Sci. 2014, 177, 68–74

Bahasa

English

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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PERTANIAN.

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Pernyataan Tanggungjawab

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