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CROPPING SYSTEMS

Legume Cover Crops with Winter Cereals in Southern Manitoba

Establishment, Productivity, and Microclimate Effects

Dep. of Plant Sci., Univ. of Manitoba, 222 Agriculture, Winnipeg, MB, Canada R3T 2N2

* Corresponding author (m_entz{at}umanitoba.ca)

Received for publication August 1, 2000. The opportunity to include late-season cover crops in northern cropping systems has been enhanced with the adoption of winter cereal production; however, cover crop feasibility has not been evaluated in these regions. Field experiments were conducted at two sites in Manitoba in 1998 and 1999 to (i) assess establishment and dry matter (DM) production of legume cover crops that were relay-cropped [alfalfa (Medicago sativa L.) and red clover (Trifolium pratense L.)] or double-cropped [chickling vetch (Lathyrus sativus L.) and black lentil (Lens culinaris Medik. subsp. culinaris)] with winter cereals [winter wheat (Triticum aestivum L.) and fall rye (Secale cereale L.)], (ii) assess the effect of relay cover crops on cereal grain yield, and (iii) characterize the effects of a red clover cover crop on the microclimate after winter wheat harvest. Establishment and midseason DM of the relay crops were not affected consistently by cereal crop type. Legume DM at freeze-up was similar in winter wheat and fall rye systems and ranged from 190 to 1800 kg ha^-1, with moisture availability being the critical factor. Across all site-years, final DM for red clover, alfalfa, chickling vetch, and lentil averaged 1157, 690, 746, and 634 kg ha^-1. Relay crops did not affect main-crop grain yield but did significantly reduce main-crop DM production in some cases. The red clover cover crop created a moderating effect on late summer and fall surface (5-cm height) air temperatures and decreased soil moisture availability. Including relay and double crops in winter cereal-based cropping systems appears feasible in southern Manitoba.

Abbreviations: DM, dry matter

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