Publication Date
1997
Description
In seed production experiments with timothy (Phleum pratense L.) split application of 25 kg N ha-1 as early as possible in spring (mean date 17 April) plus 50 kg ha-1 at the start of tiller elongation (mean date 19 May) increased seed yields compared to only one application of 75 or 100 kg N ha-1 in mid-May. On plots not receiving nitrogen until mid-May, the seed yield increase resulting from an additional application of 25 kg N ha-1 at heading (mean date 19 June) could be related to the ratio between measured and critical per cent nitrogen in plant dry matter at that stage. The optimal amount of nitrogen was related to tiller density in spring and rainfall in July, but not to soil mineral nitrogen.
Citation
Aamlid, T S., "Towards a Model for Nitrogen Application to Seed Crops of Timothy (Phleum pratense)" (2024). IGC Proceedings (1997-2023). 22.
https://uknowledge.uky.edu/igc/1997/session24/22
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Towards a Model for Nitrogen Application to Seed Crops of Timothy (Phleum pratense)
In seed production experiments with timothy (Phleum pratense L.) split application of 25 kg N ha-1 as early as possible in spring (mean date 17 April) plus 50 kg ha-1 at the start of tiller elongation (mean date 19 May) increased seed yields compared to only one application of 75 or 100 kg N ha-1 in mid-May. On plots not receiving nitrogen until mid-May, the seed yield increase resulting from an additional application of 25 kg N ha-1 at heading (mean date 19 June) could be related to the ratio between measured and critical per cent nitrogen in plant dry matter at that stage. The optimal amount of nitrogen was related to tiller density in spring and rainfall in July, but not to soil mineral nitrogen.
