Effect of Gibberellic Acid Spray during Ontogeny of Mustard on Growth, Nutrient Uptake and Yield Characteristics

Abstract

In a field trial conducted during 1993-1994, mustard {Brassica funcea L. Czern & Coss.) cv. Varuna was sprayed with either deionised water or 10'' M GAj at 40 (vegetative stage), 60 (flowering stage) or 80 (pod fil! stage) days after sowing (DAS) to select the suitable growth stage for spray for augmenting productivity of the crop. Shoot length per plant, leaf number per plant, leaf area per plant, dry weight per plant and leaf area index and accumulation of N. P and K were recorded at 100 DAS. Pods per plant, seeds per pod. 1000 seed weight, seed yield, biological yield, harvest index and seed yield merit were computed at harvest. Growth, NPK accumulation and yield were maximal when spraying was done at 40 DAS. However, spraying at 40 and 60 DAS gave at par values for most of the growth and yield parameters. It was also noted that there was a significant difference in spray treatment at different growth stages only when GA, was sprayed and not when water was sprayed.

Effect of Macronutrients and Gibberellic Acid on Photosynthetic Machinery, Nitrogen-Fixation, Cell Metabolites and Seed Yield of Chickpea (Cicer arietinum L.)

“…The observed increase in seed protein content due to foliar application and due to pre-sowing seed treatment of GA is not surprising. An improvement in protein synthesis may result from the application of GA and P and S, hence higher values for seed protein content [96][97][98][99][100]. These results broadly corroborate with the findings of [87] on GA application and of on P and S although on basal application.…”

Effect of auxin and gibberellic acid on growth and yield components of linseed (Linum usitatissimum L.)

“…Albizia lebbeck, Senna siamea, Prosopis africana and Parkia biglobossa (Ebofin et al 2003) and in Lagenaria siceraria (Vwioko and Longe 2009) also supported the results of the present research. Khan et al (1998) reported that foliar application of gibberellic acid at the pre-flowering A Rastogi et al…”

The influence of gibberellic acid and sulfur fertilization rate on growth and S-use efficiency of mustard (Brassica juncea)

“…The spray stage 40 DAS has been identified as the most suitable. The other spray stages and concentrations of GA 3 application were found less effective (Khan et al, 1998(Khan et al, , 2002a. The treatments were arranged in a randomised block design with four replications.…”

“…It was hypothesised that if plants were managed for better use of N, photosynthesis and enhanced shoot growth with the use of GA 3 , it could lead to increased S-use efficiency (SUE) of the crop. Research has shown that GA 3 promotes growth (Rood et al, 1990;Khan, 1996;Khan et al, 1998Khan et al, , 2002a; Nagel et al, 2001), photosynthesis (Khan 1996;2002b;Khan and Samiullah, 2003) and nitrogen utilization (Khan et al, , 1998(Khan et al, , 2002bNagel and Lambers, 2002). The reported research was, therefore, conducted to determine the effects of GA 3 spray at the whole plant level on growth, photosynthesis, N accumulation and its implication on SUE (proportion of applied S recovered by the plants) of mustard under different levels of S.…”