The effects of lodging and a paclobutrazol — chlormequat chloride mixture on the yield and quality of oilseed rape

Abstract

The effects of lodging and a plant growth regulator mixture on oilseed rape cv. Ariana were studied in three field experiments. Natural and artificially induced lodging treatments varying in time of imposition and severity were compared to a supported control. A mixture of paclobutrazol and chlormequat chloride was applied either as a spray or as paclobutrazol granules followed immediately by a chlormequat chloride spray.In 1987, severe lodging treatments reduced yield by up to 52%. Yield penalties varied with the time at which lodging was imposed. Yield was inversely correlated with the ground cover of volunteers growing from shed seed under lodged crops.In 1988, two experiments showed increased incidence of disease and decreases in seed yield and quality in lodged crops. Yield reductions were related to the severity of lodging. Lodging decreased oil contents and increased glucosinolate levels. PGR treatments reduced lodging and maintained yield at a level not significantly different to a supported control treatment. Oil contents were also similar in seed from PGR treated and control plots. Glucosinolate levels in PGR treated seed were similar to control levels in one experiment and intermediate to those from control and artificially lodged plots in another experiment.The results are discussed in relation to the use of PGRs to prevent lodging in 'double zero' varieties of oilseed rape, and the potential losses from using ground vehicles to apply pesticides after flowering.

Modification of growth, yield and lodging response of lentil to phosphorus by paclobutrazol

“…Excessive use of nitrogen and phosphorus fertilisers result in severe lodging, which is the major cause of yield loss (Gill, 1992). Crops that were naturally or artificially lodged were more susceptible to diseases and produced lower yields than crops that were mechanically supported or prevented from lodging by treatment with plant growth retardants (Baylis & Wright, 1990). Inhibitors of gibberellin biosynthesis, such as chlormequat chloride (Saini, Jolly & Singh, 1987) and paclobutrazol (Baylis & Huntley-Bull, 1991), have been used successfully to prevent lodging and increase seed and oil yields of brassica oilseed crops.…”

Interactive Role of Fungicides and Plant Growth Regulator (Trinexapac) on Seed Yield and Oil Quality of Winter Rapeseed

“…At Giessen it was observed that by reducing the concentration of Toprex from 0.5 to 0.35 L· ha −1 in combination with Ortiva increased lodging. Baylis and Wright (1990) [15] also observed similar results after applying paclobutrazole on winter rapeseed. 1000-grain weight (TGW) is an important yield component because large seed is more valuable.…”

“…These treatments protected plants from severe lodging compared to the control treatment. Lodging caused mechanical damage to seeds during harvesting [15], and damaged seeds led to increased PV. Severely lodged cv.…”

Enantioselective Degradation of (2RS,3RS)‐Paclobutrazol in Peach and Mandarin Under Field Conditions

“…However, compared with its excellent growth regulation effects, the fungicidal effect of this chemical is actually rather minor Accordingly, paclobutrazol is used as an important plant growth regulator in most cases. Other beneficial effects, such as improved bud production, fruit quality, and yield, are also recognized . Since its wide application on various crops worldwide and side effects, such as potential endocrine‐disrupting properties, concerns have arisen regarding the potential risk to humans and wildlife from exposure to its residue and metabolites …”

“…Other beneficial effects, such as improved bud production, fruit quality, and yield, are also recognized. 2,[4][5][6][7] Since its wide application on various crops worldwide and side effects, such as potential endocrine-disrupting properties, concerns have arisen regarding the potential risk to humans and wildlife from exposure to its residue and metabolites. 8,9 Moreover, paclobutrazol is a chiral compound because of the presence of asymmetrically substituted carbon atoms in the triazole alkyl moiety.…”