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Abstract
To study the effects of systemic nematicides on soil biological activity, fenamiphos or oxamyl was applied to 2500 m2 plots of grazed pasture in coastal Wairarapa, with normal pasture and high clover plots as untreated controls. This paper provides the background for associated biological and biochemical studies. The dominant soil was a Typic Haplaquoll and the following soil groups were also present: Aeric Fluvaquent.; Mollic Udifluvent.; Fluvaquentic Hapludoll.; and Dystric Eutrochrept — a soil map and profile descriptions are given. Pasture production was 9.2 t/ha over the trial period (376 days) and was apparently limited by the summer moisture deficit. Soil moisture tended to exceed field capacity in winter and be at about wilting point in summer. Rainfall totalled 1182 mm over 377 days. Soil temperature to 50 cm was monitored, and data for 18 periods at 6 depths were tabulated. At 5 cm, fortnightly averages were 10.1–20.9°C. Fenamiphos residues were still detectable a year after application, but oxamyl residues persisted only 70 days.
