Åsa Myrbeck
Swedish University of Agricultural Sciences
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Featured researches published by Åsa Myrbeck.
Acta Agriculturae Scandinavica Section B-soil and Plant Science | 2014
Åsa Myrbeck; Johan Arvidsson; Thomas Keller
Delaying tillage and incorporation of arable crop residues in autumn may limit accumulation of soil mineral nitrogen (SMN) and reduce nitrogen (N) leaching. However, on clay soils, high water content during late tillage can impair soil structure and fertility. This study investigated the effects of tillage timing on SMN (0–90 cm depth), soil physical properties in the topsoil and yield in two Swedish clay soils differing in clay content. SMN generally increased during autumn and also with earlier tillage. On a heavy clay soil (Ultuna; ∼60% clay), SMN increased throughout winter until spring and the amount of N leached was probably small. In contrast, on a clay loam soil in southernmost Sweden (Rydsgård; ∼35% clay), SMN decreased during winter by up to 26 kg ha−1. In general, measured soil water content (w) was lower than 0.9 × plastic limit (PL) at the time of early tillage (mouldboard ploughing or stubble cultivation), while it exceeded 0.9 PL at the time of normal and late tillage. The proportion of small aggregates produced by tillage was negatively correlated to relative soil water content at the time of tillage (w/PL). Conventional methods to determine soil physical qualities (bulk density, saturated hydraulic conductivity, aggregate tensile strength) did not show any clear differences between treatments. However, plant emergence and yield were significantly reduced after late compared with early tillage at Ultuna, a trend that has persisted from 2000 until the present. These results suggest that the suitability of delayed autumn tillage as a means to reduce SMN accumulation and N leaching varies between Swedish clay soils. A reduction in N leaching can be achieved on lighter clay soils in warmer and moister areas, whereas the effects may be small on heavier clay soils in central Sweden, where repeated late tillage carries a risk of yield reduction.
Soil Use and Management | 2002
C.A. Watson; H. Bengtsson; M. Ebbesvik; A.K. Loes; Åsa Myrbeck; E. Salomon; J.J. Schröder; E.A. Stockdale
Soil & Tillage Research | 2002
Inge Håkansson; Åsa Myrbeck; Ararso Etana
Geoderma Regional | 2015
Christopher Poeplau; Helena Aronsson; Åsa Myrbeck; Thomas Kätterer
European Journal of Agronomy | 2012
Åsa Myrbeck; Maria Stenberg; Johan Arvidsson; Tomas Rydberg
Soil & Tillage Research | 2012
Åsa Myrbeck; Maria Stenberg; Tomas Rydberg
Soil Use and Management | 2014
Åsa Myrbeck; Maria Stenberg
Archive | 2005
Maria Stenberg; Åsa Myrbeck; Börje Lindén; Tomas Rydberg
Archive | 2012
Johan Arvidsson; Ararso Etana; Åsa Myrbeck; Tomas Rydberg
Archive | 2003
Åsa Myrbeck; Johan Arvidsson; Thomas Keller