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Establishing tagasaste from seed in Waikato hill country

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posted on 2023-08-20, 21:25 authored by Katherine TozerKatherine Tozer, Caitlyn Dawbin, Rose GreenfieldRose Greenfield, Grant Douglas, Catherine CameronCatherine Cameron

Tagasaste (tree lucerne) can be difficult to establish from seed due to its hard seed coat and high levels of seedling mortality. Three experiments were performed. Experiment 1: Effect of gibberellic acid, potassium nitrate, seed nicking + soaking in warm water (38oC for 24 hours), soaking seeds in boiling water and a coldwater control on germination. The highest germination percentage occurred from the warm and boiling water treatments. Experiment 2: Effect of slug bait, rhizobia and phosphorus fertiliser on establishment of tagasaste seed which had been hand sown into a herbicide-treated pasture. Of the 1600 hand-sown seeds, emergence was negligible, and no treatments varied significantly from the untreated control. Greater pasture suppression is required for successful establishment. Experiment 3: Examined removal of 20%, 40%, 60% or 80% of the height of a seedling on tagasaste branching. Branch number was similar for all treatments 83 days after trimming the main stem. Removing 20% or 40% of the seedling height produced three-fold greater edible dry matter than when 80% of the seedling height was removed (P<0.001). Although pruning treatments did not affect branch number, a less severe pruning regime resulted in the regrowth of the greatest amount of edible dry matter.

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Rights statement

This work is licensed under a Creative Commons Attribution-Non Commercial-NoDerivatives 4.0 International License. Rights granted to the New Zealand Grassland Association through this agreement are non-exclusive. You are free to publish the work(s) elsewhere and no ownership is assumed by the NZGA when storing or curating an electronic version of the work(s).

Publication date

2023-05-16

Project number

  • Non revenue

Language

  • English

Does this contain Māori information or data?

  • No

Publisher

NZ Grassland Association

Journal title

Journal of New Zealand Grasslands

ISSN

2463-2872

Volume/issue number

84

Page numbers

41-48

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