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Report, 1998

Förändring i markvattenhalt vid odling av sockerbetor och vårstråsäd

Olsson Lennart, Persson Patrik

Abstract

This work was a part of a larger project, which tries to estimate the risk of soil compaction in the subsoil when using heavy sugar beet harvesters, in relation to soil type and water content in the field at harvest time. The purpose of this study was to follow the changes in soil water con tent during the growing period, in a spring sown crop and in sugar beets. Two sites with different soil types were used during the period of growth 1997. The method used was to take soil samples for gravimetric water content every two weeks in 10 cm layers to 1 m depth. Saturated hydraulic conductivity and water retention was determined on soil cores in each 10 cm layer to l m depth. Meteorological data was collected from nearby weather stations. The calculated evaporation from the crop was compared with the potential. The water content in the subsoil changed more slowly than in the topsoil. The cereal crop absorbed more water than the sugar beets until the middle of the summer, but during late summer and autumn the water content in the soil was lower in the sugar beets than in the cereal crop. At both sites the profile was practically emptied on plant accessible water down to l meter during the summer. At one of the sites the calculated transpiration from 6 July to 8 August was approximately half of the potential, which indicates that the crops suffered from drought. At harvest time of the cereal crop the soil had low water con tent. The water content in the sugar beet field was larger at the time of harvest of the sugar beets. At harvest time of the cereal crop there was little risk of subsoil compaction because of the low soil water content. At the time of sugar beet harvest there was probably a risk of subsoil compaction. A possibility to avoid compaction would be to harvest the sugar beets before an expected large rainfall, although some losses of sugar may occur during the storage of the sugar beets

Keywords

jordbearbetning; jordpackning; betupptagare; jordart; vattenhalt; växtsäsong; fältförsök; skördetidpunkt

Published in

Meddelanden från Jordbearbetningsavdelningen
1998, number: 25
Publisher: Institutionen för markvetenskap, Avdelningen för jordbearbetning, Sveriges lantbruksuniversitet

Authors' information

Olsson, Lennart
Swedish University of Agricultural Sciences, Department of Soil Sciences
Persson, Patrik
Swedish University of Agricultural Sciences, Department of Soil Sciences

UKÄ Subject classification

Agricultural Science

URI (permanent link to this page)

https://res.slu.se/id/publ/30630