WHEAT RESIDUE AND NITROGEN PLACEMENT EFFECTS ON WHEAT GROWTH IN THE GREENHOUSE

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Abstract
We measured the effects of winter wheat residue, residue placement, nitrogen fertilizer placement, and nitrogen rates on winter wheat growth in greenhouse pot and split root studies under conditions simulating cool-wet spring conditions in the Pacific Northwest. Phytotoxicity to winter wheat plants from decomposing winter wheat residue could not be demonstrated in these studies. When winter wheat straw was mixed with the soil, wheat plant yield decreased significantly, but the decrease was largely overcome by higher rates of N application; hence, in this case, N immobilization during straw decomposition, and not phytotoxicity, appeared to be a primary factor causing yield decreases. We measured the effects of winter wheat residue, residue placement, nitrogen fertilizer placement, and nitrogen rates on winter wheat growth in greenhouse pot and split root studies under conditions simulating cool-wet spring conditions in the Pacific Northwest. Phytotoxicity to winter wheat plants from decomposing winter wheat residue could not be demonstrated in these studies. When winter wheat straw was mixed with the soil, wheat plant yield decreased significantly, but the decrease was largely overcome by higher rates of N application; hence, in this case, N immobilization during straw decomposition, and not phytotoxicity, appeared to be a primary factor causing yield decreases. © Williams & Wilkins 1981. All Rights Reserved.

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