Revegetation of river silt deposits
1990
Gray, M.H. (MAF Technology, Gisborne (New Zealand)) | Korte, C.J. (MAF Technology, Bulls (New Zealand))
Approximately 8000 ha of land in the Gisborne-East Coast Region, New Zealand were covered in river silt during Cyclone Bola in March 1988. Silt was up to 1.5 m deep, had a mean pH of 7.9, and was often poorly drained. An experiment was conducted to provide recommendations on revegetation by oversowing. Establishment was successful when seed was sown while the silt surface was still damp, but unsuccessful after the silt surface dried. Lolium multiflorum, L. perenne, and Bromus willdenowii all established, with the first species being most vigorous. Legumes (Trifolium repens, T. fragiferum, Medicago sativa) established sparsely, but Trifolium spp developed full ground cover by summer. All species, except Lolium multiflorum, responded positively to diammonium phosphate fertiliser. Lolium multiflorum without fertiliser yielded more than other species with fertiliser
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