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Three experiments were carried out to evaluate the applicability of the intensive management system to barley production in Quebec. In the first experiment, the effects of three levels of nitrogen fertilizer and ethephon (Cerone) on the performance of cultivars were tested. The aim of the second experiment was to test the effects of fungicide application and row width. In the third experiment, conventional and intensive management techniques were tested on three soil types. / High levels of nitrogen increased the grain protein content and thus improved the feed quality of spring barley. Application of ethephon reduced plant height but also reduced the number of grains per head. A fungicide by row width interaction resulted in a reduced seed size and weight in the narrow rows. The effects of intensive management on yield were inconsistent and were influenced to a large extent by the prevailing weather and soil conditions.

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Plant growth regulator(s) (PGR) can be used as lodging inhibitors and/or yield promoters for spring barley (Hordeum vulgare L.). From 1987 to 1990 four field experiments were conducted to monitor barley main-stem apical development and to determine the effects of chlormequat (CCC) and ethephon on the development, physiology and yield of spring barley. Our data provide a description of barley apical development and the general pattern of leaf and spikelet primordium production under field conditions. In general, PGR treatment reduced the apical dominance of dominant sinks allowing the survival and greater development of more subordinate sinks. Early application of either CCC or ethephon retarded development of the main-stem apex from shortly after application to the awn elongation stage and reduced the number of aborted spikelet primordia, thus increasing the potential number of grains per spike and sometimes grain yield. Ethephon applied at ZGS 39 reduced plant height and lodging. Early application (ZGS 30) of ethephon, alone or in combination with CCC increased the number of spikes m$ sp{-2},$ but not grain yield. The number of spike-bearing shoots per unit area or per plant was increased by early PGR treatment, primarily by enhancement of tiller number rather than tiller survival. Early application of CCC or ethephon to spring barley is not justified, and caution must be taken when using ethephon at the currently recommended rate and stage for lodging control. Post-anthesis application of ethephon can efficiently enhance grain fill and yield of spring barley.

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No description available.

No description available.