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Department of Soil Science, Univ. of Saskatchewan, 51 Campus Drive, Saskatoon, SK, Canada S7N 5A8
*Corresponding author (vankessel{at}sask.usask.ca).
ABSTRACT
The inclusion of a pulse crop in a rotation often leads to an increase in seed yield of the succeeding cereal crop. Landscape-scale and small-plot studies were established in 1993 to assess the N and non-N rotation benefit by pea (Pisum sativum L.) to the subsequent wheat (Triticum aestivum L.) crop. In the second rotation phase, wheat seed yields were 982 kg ha–1 greater and total N accumulation increased by 46 kg ha–1 in the pea-wheat rotation. Reduced leaf disease severity and grassy weed infestation were related to 91% of the yield advantage in the pea-wheat rotation, the non-N rotation benefit. A 129 N kg ha–1 increase in the A value (soil N supplying power) was related to 9% of the yield advantage in the pea-wheat rotation, the N benefit. In both rotations, seed yield was about 400 kg ha–1 lower in the high-catchment footslopes than the low-catchment footslopes and shoulders. The landform effect on seed yield in the pea-wheat rotation was related to greater soil water and N content in the high-catchment footslopes. Increased grassy weed infestation in the high-catchment areas of the wheat-wheat rotation was related to lower seed yields in this same area. The rotation benefit of pea to wheat was 34% greater in the landscape-scale vs. the small-plot study. Topographic variation interacted with factors responsible for the non-N rotation benefit. A landscape-scale assessment of the rotation benefit from legumes can be used to develop site-specific management strategies that consider the effect of crop rotation.
Contribution no. R787 of the Saskatchewan Centre for Soil Research.
Received for publication July 24, 1995.
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