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Trials with Sulfur‐Coated Urea and Other Nitrogenous Fertilizers on Pinus radiata in New Zealand
Author(s) -
Mead D. J.,
Ballard R.,
Mackenzie M.
Publication year - 1975
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1975.03615995003900050046x
Subject(s) - coated urea , urea , pinus radiata , radiata , topsoil , sulfur , slash pine , nitrogen , chemistry , agronomy , sowing , nutrient , pinus <genus> , environmental science , botany , soil water , biology , soil science , vigna , organic chemistry
Sulfur‐coated urea fertilizers were included in six experiments with seedlings of Pinus radiata D.Don. The fertilizers were applied in notches alongside seedlings about 2 months after planting, and tree growth was measured for 2 or 3 years. After slash burning on a strongly weathered clay soil, slow‐release nitrogen fertilizers, including three formulations of S‐coated urea, proved more effective than urea. On a more fertile pumice soil, on both slash burnt and unburnt sites, no response to N fertilizers was detected. However, where the topsoil of this soil type had been either completely or partially removed (a log landing and a windrowed area, respectively) a response to N occurred. In these two disturbed areas S‐coated urea showed no advantage over conventional soluble NH 4 ‐N fertilizers. There were no differences between the effectiveness of the three formulations of S‐coated urea at any of the experimental sites.