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Trials with Sulfur-Coated Urea and Other Nitrogenous Fertilizers on Pinus radiata in New Zealand¹

ABSTRACT

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 NH₄-N fertilizers. There were no differences between the effectiveness of the three formulations of S-coated urea at any of the experimental sites.

¹ Contribution from Forest Research Institute, Rotorua, New Zealand.

² Officers of Forest Research Institute, Private Bag, Rotorua, New Zealand.

Received for publication February 18, 1975. Accepted for publication May 1, 1975.