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    Comparison of three plant growth regulators and urea on a Canterbury dairy pasture

    Jiang, Shuang; Carey, Peter; Roberts, A.; Kerse, G.
    Abstract
    Two plant growth regulator (PGR) products currently available in New Zealand and a new Ravensdown PGR product-ExpressTM*, all based on gibberellic acid (GA3), were applied to a Canterbury dairy pasture in late winter (August) and early spring (September) and their effect on dry-matter (DM) yield was measured. PGR treatments were compared with both an application of liquid urea (20 kg N/ha) alone and a urea plus Express treatment. In the first harvest of both winter- and spring-initiated trials, a month following PGR application, the PGR treatments produced significant increases in DM yield ranging from 18-51% over the control. These increases, however, did not extend to the second harvest in either trial for any of the PGR agents. The application of urea increased production in the 1st harvest by ~36% in both trials but this was increased to over 60% when combined with ExpressTM. No effect of the PGR was apparent in the second harvest where the urea treatment alone was the highest DM producer. These trials showed some benefit in the use of PGR products when there is a need to boost pasture growth in early spring but these benefits largely disappeared after the first month following application.Some future research may be useful to further optimise parameters for the use of PGR products.... [Show full abstract]
    Keywords
    gibberellic acid; plant growth regulators; Urea; pasture
    Fields of Research
    0703 Crop and Pasture Production; 079902 Fertilisers and Agrochemicals (incl. Application)
    Date
    2011-02
    Type
    Conference Contribution - published (Conference Paper)
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    • Lincoln Agritech [64]
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    © The Authors & FLRC.
    Citation
    Jiang, S., Carey, P.L., Roberts, A., & Kerse, G.( 2011). Comparison of three plant growth regulators and urea on a Canterbury dairy pasture. In L.D. Currie and C L. Christensen (Eds.), Adding to the knowledge base for the nutrient manager: Occasional Report No. 24. Fertilizer and Lime Research Centre, Massey University, Palmerston North, New Zealand. Retrieved from http://flrc.massey.ac.nz/workshops/11/Manuscripts/Jiang_2011.pdf
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