RESEARCH ARTICLE


Over-Drilling New Zealand Tussock Rangeland with or without a Previous Legume Phase



David Scott*
P.O. Box 60, Lincoln, New Zealand


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Scott et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* *Address correspondence to this author at the P.O. Box. 115, Lake Tekapo, New Zealand; Tel: 03 6806 718; E-mail: scottd_hc@xtra.co.nz


Abstract

A nineteen year trial at Lake Tekapo compared the longer term trends of over-drilling legume and grasses into either previous undeveloped tussock country or following a previous legume phase. Tall oat grass (from summer sowing) and cocksfoot (from spring sowing) were the most successful of the sown grasses. They remained a low proportion of the swards but greater with prior herbicide treatment, sown with an experimental drill giving partial cultivation and with starter nitrogen fertiliser. Perennial lupin became the main species in the previous undeveloped block and was increasing in the previous developed block. The analysis stage considered the inclusion of covariates for contoured location responses as well as treatment effects in such multi-plot field trials on uneven ground.

Keywords: New Zealand, rangeland, pasture development, perennial lupin, cocksfoot, tall oat grass, experimental design.