Response of pea (Pisum sativum L.) to mepiquat chloride under varying application doses and stages

Abstract

Grown as a monoculture, peas (Pisum sativum L.) exhibit severe lodging after flowering and lodging causes yield reductions considerable. This study was conducted to investigate the effects of dose (untreated, 25, 50, 75 and 100 g a.i. ha )1 ) and stage (late vegetative, early blooming and early pod filling) of mepiquat chloride (MC) application on the growth, lodging control, seed yield and yield parameters of pea (Pisum sativum L.) under field conditions in Erzurum, Turkey in 2002 and 2003. Application doses of 25, 50, 75 and 100 g a.i. ha )1 significantly reduced stem height by 5.3 %, 7.2 %, 7.5 % and 6.4 % and increased stem width by 7.5 %, 12.7 %, 12.3 % and 15.7 % respectively, when compared with the untreated control, and thereby reduced the tendency of the crop to lodging. Increases of the seed yield under different application doses of MC ranged between 13.7 % and 20.1 % over the untreated control. However, in all parameters investigated, except for stem width, higher application doses of MC gave no clear advantages compared with the application dose of 25 g a.i. ha )1 . Seed yield was also significantly influenced by application stage of MC and application at early blooming stage of crop, MC significantly increased seed yield by 11.4 % and 10.2 % when compared with the late vegetative and the early pod filling stages respectively. Furthermore, the interaction of application dose and stage was significant, and spraying of pea plants with 25 g a.i. -ha )1 MC at early blooming stage has the most beneficial effects on the characters evaluated.

Sunflower response to repeated foliar applications of Paclobutrazol

“…In addition, the inconsistent performance of many plant growth regulators in the field and the diverse effects on plant growth related to the timing of application (i.e. crop growth stage), the application rate of plant growth regulators, as well as the variable effects of the environmental conditions are considered major limitations in the use of many plant growth regulators (Scarisbrick et al, 1985;Leitch & Kurt, 1999;Elkoca & Kantar, 2006) and require studies under diverse environmental conditions. Data on the use of PBZ for reduction of plant height in sunflower under field conditions are limited.…”

Effect of Some Plant Growth Regulators With Retarding Activity on Spring Pea for Grain

“…Existing tall pea varieties are highly prone to lie down. The lying down in the period of pod forming leads to reduction of leaf area, the content of chlorophyll and photosynthetic activity of chloroplasts, which ultimately results in reduced yields of pea grain and fodder with deteriorated quality (Amelin, 1997(Amelin, a, 1997bKertikov, 1999;Elkoca and Kantar, 2006).…”

“…The investigations of Sanghavi et al (1980), Chandra et al (1989), Sarma (2003, 2006), Elkoca and Kantar (2006) show that the spraying of peas plants during the vegetation with chlorocholine chloride (CCC, Chlormequat, Cikocel) leads to reduced height, increased stem thickness and reduced tendency to lying down. A positive effect on increasing of germination of seed during storage and germination of seeds on the field (Kanp et al, 2009), the contents of chlorophyll Sarma, 2003, 2006;Kanp et al, 2009), the mass of 1000 seeds and harvest index (Chandra et al, 1989) and increase the yield of seeds (Elkoca and Kantar, 2006) was established by treatment with chlorocholine chloride.…”

“…A positive effect on increasing of germination of seed during storage and germination of seeds on the field (Kanp et al, 2009), the contents of chlorophyll Sarma, 2003, 2006;Kanp et al, 2009), the mass of 1000 seeds and harvest index (Chandra et al, 1989) and increase the yield of seeds (Elkoca and Kantar, 2006) was established by treatment with chlorocholine chloride.…”

Management of poppy (Papaver somniferum L.) stand height using growth regulators

“…Spitzer et al (2011) found similar results also in sunflower. Elkoca and Kantar (2006) investigated the effects of different doses of mepiquat chloride on growth, lodging control, seed yield, and yield parameters in pea (Pisum sativum L.) under field conditions in Turkey. Application rates of 25, 50, 75, and 100 g a.i./ha significantly reduced stem height, increased stem width, and thereby reduced the tendency of the crop to lodge.…”