Abstract
The benefits and environmental impacts of using fertilizers rather than legumes to promote more sustainable agricultural production systems are in question. The objective of this study was to demonstrate the long-term consequences of withholding fertilizer N and P on wheat (Triticum aestivum L.) yields, and to determine if inclusion of legume-green manures (GM), or hay crops in rotations can maintain wheat yields. A 34-yr crop rotation experiment being conducted at Indian Head, Saskatchewan, on a Udic Haploboroll with heavy clay texture, was used to assess the influence of fertilizer (N and P), sweetclover (Melilotus officinalis L.) GM, and alfalfa-bromegrass (Medicago sativa L. - Bromus inermis Leyss.) hay on yield trends of hard red spring wheat grown on wheat stubble in rotations of varying cropping intensity [...]
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