Journal of Food, Agriculture and Environment

Dependence of mobile humus substances formation on green manure plant species and their incorporation time

Author(s):

Liudmila Tripolskaja ¹*, Alvyra Slepetiene ², Danuta Romanovskaja ¹, Almantas Razukas ¹, Eugenija Bakšienė ¹

Recieved Date: 2014-02-26, Accepted Date: 2014-04-19

Abstract:

The aim of the study was to determine the impact of different plant species (Trifolium pratense L., Dactylis glomerata L. and Secale cereale L.) and their incorporation timing (spring and autumn) on formation of mobile humus substances (MHS) and to evaluate the dependence of their changes on plant chemical composition. Field experiment was conducted on sandy loam Luvisol. Content of mobile humus substances in arable soil layer (0-20 cm) was ascertained in 0.1 mol L^-1 NaOH. It was found that during the first year of green manure decomposition, the MHS content in soil increased by 8.7-11.2 mg/kg C, during the second year of decomposition, it increased by 9.0-11.3 mg/kg C, incorporation of orchard grass induced the increase of MHS content. Higher MHS content (+1.4-2.3 mg/kg C, P<0.05) formed after the biomass incorporation in spring, compared with autumn. Plant chemical composition influenced the formation of MHS. Regardless of the green manure incorporation time, the content of newly formed MHS strongly correlated (R² = 0.883-0.941, P<0.05) with the concentration of lignin in the plant aboveground part. Correlation of C:N ratio and fibre concentration with MHS content depended on the biomass incorporation time. Strong correlation between C:N ratio in plants and increase of MHS in soil during the first and second years of biomass decomposition (R² = 0.973, 0.998) was recorded after the incorporation of biomass in autumn, while with a fibre content (R² = 0.988, 0.953), it was recorded after the incorporation in spring.

Keywords:

Mineralization, lignin, cellulose, C:N, mobile humus

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Journal: Journal of Food, Agriculture and Environment
Year: 2014
Volume: 12
Issue: 2
Category: Agriculture
Pages: 473-477

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