Tag Archives: Stability

Genotype x Environment Interaction and Stability for Grain Yield of Buckwheat (Fagopyrum Tataricum Geartn)

Manoj Kandel(1) and Jiban Shrestha*(2)

 

(1). Nepal Agricultural Research Council, Hill Crops Research Program (HCRP), Baiteshwor-4, Kabre, Dolakha, Nepal.

(2). Agriculture Botany Division, Nepal Agricultural Research Council, Khumaltar, Lalitpur, Nepal.

(*Corresponding author: manojkandel24@gmail.com).

Received: 23/08/20219                               Accepted: 05/09/2019

Abstract

Stability analysis is an important step in developing cultivars. Seven buckwheat genotypes were evaluated at hilly regions of Nepal namely Dolakha, Ramechhap, Solukhumbu, Kaski, Dailekh, Surkhet, Jumla and Doti districts during winter seasons of 2017 and 2018 using randomized complete block design with three replications to identify stable and high yielding genotypes. The genotype × environment interaction for grain yield was significant (P≤0.05). The genotypes ACC#2227-1 (1.62 t/ha) and ACC#2223-1 (1.52 t/ha) were found higher sensitive to environment and produced higher mean grain yield across the locations. Joint regression analysis showed that genotypes ACC#2227-1 and ACC# 2223-1 had regression coefficient of 1.41 and 1.33, respectively. The coefficient of determination (R2) for genotypes, ACC#2227-1 and ACC#2223-1 were higher. The GGE biplot analysis showed that ACC#2227-1 and ACC#2223-1 were more stable and adaptive across the locations; therefore, they can be taken for general cultivation.

 Keywords: Buckwheat, G×E interaction, Stability, Grain yield.

Full paper in English: PDF

Yield Stability Parameters of Sugar Beet (Beta vulgaris L.) Cultivars in Iran

Saeed Sadeghzadeh Hemayati(1), Abazar Rajabi*(1), Mohammadreza Orazizadeh(1)

(1). Sugar Beet Seed Institute, Agricultural Research, Education and Extension Organization, Karaj, Iran.

(* Corresponding author: Dr. Abazar Rajabi: E-Mail: rajabi@sbsi.ir).

Received: 18/04/2017                                 Accepted: 19/07/2017

Abstract

The present study focused on estimating yield stability of sugar beet cultivars in Iran. The data were collected from pilot studies on imported and domestic cultivars. Twenty-one cultivars of sugar beet were compared in 12 main spring growing regions of Iran in 2014, in randomized complete block design, with three replications. The effect of location and cultivar was significant (P≤0.05) on root yield. Among the cultivars, Pauletta and Fernando had the highest root yield (75.8-80.5 t/ha), followed by SBSI034 and BTS 335 (70 t/ha), whereas Canaria, Rasta, Torbat, Novodoro, Tucan, Morly, Aria, Pars, Antec, Nagano, Rosier, Iris, Flores, Boomrang, Sanetha, and Ekbatan had the lowest root yield (56.2-67.2 t/ha). The significance of location × cultivar interaction (P≤0.05) showed that cultivars did not have uniform performance at different locations. Estimation of different stability parameters revealed that Fernando, Pauletta, SBSI-034 and BTS-335 had high root yield and stability, while Boomrang, Iris, Isabella, Morly, Novodoro, Rasta, and Rosier were found to be cultivars with low yield and stability. Pars, Torbat, Iris, Flores, Morly, Ekbatan, BTS-335, Canaria, Antec, and Rosier displayed moderate stability. The estimation of the reliability of root yield for different cultivars at different levels of agriculture development indicated that Pauletta, Fernando, SBSI-034, TBS-335 and Aria had higher reliability than the other cultivars under both modern and subsistence farming conditions.

Keywords: Location × cultivar interaction, Sugar beet, Stability, Root yield.

Full paper in English: PDF