THE EFFECT OF SOIL CATENA AND PHOSPHORUS ON THE YIELD OF WHEAT IN WESTERN MANITOBA

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Abstract
An investigation of the yield and plant response to phosphorus on Black Chernozemic soils occurring in catenary sequence indicated that a large proportion of the total variance was attributable to fields and to the interaction between fields and soils. It is evident from the results that no simple relationship exists between the productivity of the soils in the catenas sampled and their morphological characteristics. This variability is thought to be due in part to changes in microclimatic factors as affected by the shape, size and aspect of the drainage areas sampled and by seasonal and yearly fluctuations in meteorological factors, and also due in part to the effect of these changes on the competitive ability of weeds.Plant response to phosphorus was related to the topographic position of the soil. The lowest topographic position (Gleyed-Calcareous Black) of the Miniota association required approximately twice as much phosphorus to maximize profits from wheat as the better drained (Orthic-Black) locations. Similar results were obtained by sampling the Carroll soil association. However, within the Waskada association an interaction between plant response to phosphorus and topographic position was obtained in only one year out of four.
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