Agronomic assessment of gibberellic acid and cytokinin plant growth regulators with nitrogen fertiliser application for increasing dry matter production and reducing the environmental footprint

Autor:	A. Ghani, J. Wyatt, S. Ledgard, W. Catto
Rok vydání:	2014
Předmět:	geography geography.geographical_feature_category chemistry.chemical_element Biomass General Medicine Biology Nitrogen Pasture chemistry.chemical_compound Agronomy chemistry Cytokinin Urea Dry matter Leaching (agriculture) Gibberellic acid
Zdroj:	Proceedings of the New Zealand Grassland Association. 76:177-182
ISSN:	1179-4577 0369-3902
DOI:	10.33584/jnzg.2014.76.2941
Popis:	Plant growth regulators (PGRs) are increasingly being used in agriculture for a variety of purposes. In pasture systems, the use of PGRs is relatively new and the effects of its application on plant productivity and physiology are poorly understood. A mowing trial was established in Waikato in early spring 2012. Key objectives from this study were: to determine effects of gibberellic acid (GA3) and cytokinin (CPPU) application with and without nitrogen (N) fertiliser application on pasture production, N concentration (%N), root biomass and potential reduction in N leaching from grazed pastures. Treatments (with five replicates) were: control, urea (40 kg N/ha), GA3 at two rates +/- urea, and CPPU at three rates +/- urea. Implications for grazed pasture and N leaching were modelled for a case study dairy farm. Application of GA3 alone showed a significant (P
Databáze:	OpenAIRE
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