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University of Saskatchewan (2012)

The Adoption of Conservation Tillage Innovation on the Canadian Prairies

Awada, Lana

Titre : The Adoption of Conservation Tillage Innovation on the Canadian Prairies

Auteur : Awada, Lana

Université de soutenance : University of Saskatchewan

Grade  : Doctor of Philosophy (PhD) 2012

Résumé
One of the major innovations in Canadian agriculture over the last five decades has been the introduction of conservation tillage. Conservation tillage - a term that includes minimum or mulch tillage and zero-tillage (ZT) - was mainly introduced to combat land degradation and promote agricultural sustainability. By the end of the 1970s, conservation tillage, with all its components, had taken shape and was ready for adoption on the Prairies. Although some farmers had adopted ZT by the late 1970s and had found it profitable, this technology was not adopted on any major scale until the 1990s. This thesis addresses the puzzle of why, if there was evidence of profitability, did the majority of farmers not adopt ZT during the 1980s. To solve this puzzle, this study examines the distributional consequences of ZT technology across both the different sectors involved in the provision of ZT and the different farmers that adopted this technology. In other words, this study determines the sectors that gain or lose from the adoption of ZT technology, and identifies the characteristics of farmers that affect the adoption of this technology. To analyze the distributional impacts across the different sectors, an equilibrium displacement model is built to examine the welfare implications of the switch from traditional tillage to zero tillage on agricultural input suppliers in the spring wheat industry in 1989. The results reveal that the move to zero tillage decreases the rent accruing to the fuel sector, increases the rent received by the owners of land, machinery, herbicide and other variable inputs (e.g., seed, fertilizer), and has no effect on the rent to farm-owned labour. The aggregate change in the return to the industry is positive, with most of the increase accruing to land owners. Two critical factors of ZT profitability were land ownership and the effectiveness of ZT equipment technology. Therefore, there is evidence that ZT was profitable for the group of farmers who own land and found the ZT equipment effective in 1989. To examine the distributional impacts across the different farmers, a heterogeneous farmer decision-making model is built under a waiting option framework. The theoretical model shows the importance of neighbourhood and farmer characteristics in the adoption of zero tillage. Neighbourhood and farmer characteristics factors are empirically tested using a panel dataset from 1991 to 2006 constructed at the census consolidated subdivision (CCS) level for the three Prairie provinces - Alberta, Saskatchewan and Manitoba - of Canada. The results of the empirical analysis show that CCSs closer to other CCSs with relatively high adoption of ZT tend, themselves, to have higher ZT adoption over time (neighbourhood effect). The results also show that education, farm ownership, large farm size, and soil erosion-high risk level positively influence the percentage of land under ZT technology. Distance to research station and brown soil type are found to be negatively impact the percentage of land under ZT. Knowing the distributional impacts of technical change across the different sectors and across the different farmers is an important element to policy-makers and other groups involved in funding agricultural R&D investment decisions.

Mots clés : zero tillage, adoption of innovations, equilibrium displacement model, neighbourhood effect

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Page publiée le 13 février 2017, mise à jour le 31 août 2019