Sorghum-sudan green manure; Its effect on nursery stock
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The use of sorghum-sudan green manure has recently attained popularity among nurserymen because of the assumption that toxic excretions of these hybrids control root-rot fungi. Greenhouse trials of 2-year duration have revealed that green manure of sorghum-sudan inflicts severe damage of tree seedlings, largely by eradication of mycorrhiza-forming fungi. Early plowing under of green manure, periodic watering, and late fall seeding of nursery crop may alleviate phytotoxicity of the sorghum-sudan residues, but the biocidic properties of these plants defeat the primary purpose of using green manure in contemporary nurseries, namely the biodegradation of toxic compounds.
Key wordsBiocidic properties Biodegradation Cylindrocladium floridanum Detoxification period Greenhouse-trials Green manure Hyden grass Hydrocyanic acid Mycotrophic organs Phytotoxicity Pinus radiata Pinus resinosa Pinosa strobus Root-rot fungi Soil productive capacity Sorghum-sudan hybrids Tree nurseries Wisconsin, USA
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