Bлияние химичесkого состава растений зеленого удобрения на гумусообразование в дерново – подзолистой почве

Vytauto Didžiojo universitetasŽemės ūkio akademij

Effect of the Chemical Composition of Green Manure Crops on Humus Formation in a Soddy-Podzolic Soil

The effects of different types of green manure (Trifolium pratense L., Dactylis glomerata L., and Secale cereale L.) and the time of its input into the soil (autumn and spring) on the contents of humus and labile humus substances in a soddy podzolic soil and the relationship between the formation of humus and the chemical composition of the applied biomass were studied. Green manure had a positive effect on the accumulation of humus in the soil. When the plants were plowed into the soil in the fall, the amount of humus formed in the soil in the first year was 0.1% higher in comparison with the spring application of green manure. The most active synthesis of new humus substances took place upon the following properties of the plant bio mass: C : N = 15–25, the cellulose content of 20–28%, and the lignin content of 14–17%. The highest amount of labile humus substances was formed during the decomposition of the biomass with the C : N ratio above 20, the cellulose content of 19–20%, and the lignin content of 14–16%Vytauto Didžiojo universitetasŽemės ūkio akademij

Interdisciplinary analysis of soil acidification hazard and its legacy effects in Lithuania

An analysis of factors influencing effective soil acidification management is reported. This analysis was conducted simultaneously at both national and local levels. These investigations were accomplished in three stages: (i) validation of acid soil spatial patterns using systems analysis and geoinformation methods; (ii) spatial statistical analysis of soil pH diversity using a statistical grid method; and (iii) development of the concept of soil acidity management. Results indicate the national spatial distribution of topsoil reaction is a natural and stable phenomenon related to Quaternary sub-surface deposits. However, secondary effects of topsoil liming are evident in both spatial and temporal soil reaction patterns