FACTORS AFFECTING GROWTH AND YIELD OF WINTER OILSEED RAPE (BRASSICA-NAPUS), 1985-89

Citation
Je. Leach et al., FACTORS AFFECTING GROWTH AND YIELD OF WINTER OILSEED RAPE (BRASSICA-NAPUS), 1985-89, Journal of Agricultural Science, 122, 1994, pp. 405-413
Citations number
16
Categorie Soggetti
Agriculture,"Agriculture Dairy & AnumalScience
ISSN journal
00218596
Volume
122
Year of publication
1994
Part
3
Pages
405 - 413
Database
ISI
SICI code
0021-8596(1994)122:<405:FAGAYO>2.0.ZU;2-Q
Abstract
Effects of agronomic factors on yield of winter oilseed rape were exam ined in multifactorial experiments, with a single-low (low erucic acid , high glucosinolate) cultivar (Bienvenu) in 1984/85 to 1987/88 and a double-low (low erucic acid, low glucosinolate) cultivar (Ariana) in 1 986/87 to 1988/89. Establishment of September-sown plots was better th an that of August-sown plots in 1984, 1987 and 1988, but not in 1985 w hen September was very dry. The total dry matter (DM) (kg/ha) of Augus t-sown plots was much greater than that of September-sown plots throug hout autumn and winter but by harvest the plant DM of late-sown plots was slightly greater. Combine-harvested yields of late-sown plots were greater than those of early-sown plots in 1984/85 (cv. Bienvenu) but not in 1988/89 (cv. Ariana); effects of sowing date on yields were sma ller in other seasons, although late-sown plots generally had larger y ields. Insecticide treatments increased combine-harvested yields in 19 87/88 (cv. Bienvenu) and 1988/89 (cv. Ariana) and increased hand-harve sted yields in 1984/85, by increasing the number of plants/M2. Fungici de spray treatments increased yields in all years except 1989, by incr easing 1000-seed weights. Application of growth regulator sprays incre ased yields in 1986/87 to 1988/89; effects on cv. Ariana were associat ed with increased numbers of pods/plant. There were no consistent effe cts of spring nitrogen rates or timing on yield or yield components.