Effects of fungicide treatments and variety on development, grain growth and yield of spring barley

摘要: SUMMARY The effects of four fungicide treatments for the control mildew on spring barley were assessed in three field experiments, one each years 1981, 1982, 1983. The (+/ - triadimenol seed treatment and +/ triadimefon foliar spray applied during early booting) chosen to mildew, hence affect yield determining processes, at different times life crop. Two experiments also tested nitrogen amounts third varieties differing their degree resistance. Mildew appeared too late production survival spikelets shoots, but reduced average grain weight by reducing rate growth. Grains upper part ear had a considerably lower growth final than grains central basal positions there was no evidence that size depended upon position within ear. incidence increased with increasing varietal susceptibility few significant interactions between these factors yield. achieved varied variety. Use two successive did not more use either alone. Amongst varieties, close correlation weight. Duration related or inversely correlated mean temperature period rapid sums similar it is suggested precise knowledge relationships incidence, may enable accurate predictions be made about likely responses treatments.