Properties of soils in the Swedish long-term fertility experiments: VII. Changes in topsoil and upper subsoil at Örja and Fors after 50 years of nitrogen fertilization and manure application

Autor: Martina Schön, Holger Kirchmann, Thomas Kätterer, Gunnar Börjesson, Karin Hamnér
Rok vydání: 2013
Předmět:
Zdroj: Acta Agriculturae Scandinavica, Section B - Soil & Plant Science. 63:25-36
ISSN: 1651-1913
0906-4710
Popis: We tested the hypothesis whether fertilization has an impact on subsoil development using data from two long-term soil fertility experiments. We chose treatments without nitrogen (N) and high N fertilizer addition in two crop rotations with and without ley and farmyard manure application. The soil properties measured included soil organic matter, microbial composition, aggregate stability, readily dispersible clay and micronutrient content in topsoil (0–30 cm) and upper subsoil (30–40 cm). Studies of two adjacent soil profiles revealed that the upper subsoil of an N-fertilized treatment had more soil organic matter, darker colour, more aggregation, more fine roots and was 10 cm thicker than that of the no-N treatment. This pronounced subsoil development in treatments with higher yields (high N input) was corroborated by carbon mass determinations based on systematic sampling including bulk density. Soil organic matter contents were higher in N-fertilized than unfertilized treatments, either with ...
Databáze: OpenAIRE
Externí odkaz:
Nepřihlášeným uživatelům se plný text nezobrazuje