Effect of foliar spraying of some chelated microelements on growth, yield and chocolate spot disease severity of faba bean [electronic resource].

Includes references.

Field experiment using three faba bean cultivars namely Sakha 1, Sakha
4 and Giza 716 was carried out to study the efficacy of foliar spraying chelated Fe, Mn
and Zn individually on vegetative growth, yield and its components, some biochemical
constituents and its relation to chocolate spot disease severity caused by Botrytis fabae
Sard. during two successive seasons 2017/2018 and 2018/2019 at Etay El-Baroud
Agricultural Research Station Farm, El-Beheira Governorate. Sakha 1 cv. had the highest
shoot dry weight and leaf area/plant in both seasons. Sakha 4 cv. was the earliest
flowering and maturity in the first and second seasons, respectively. Sakha 4 cultivar
had the tallest plant and the heaviest 100-seed weight in both seasons, but Giza 716 had
the highest number of pods/plant, seed yield !plant and seed yieldHed. in the first season,
however Sakha 4 cv. was surpassed the other cultivars in the second season. Chelated
Fe, Mn and Zn foliar spray had excellent effects in increasing faba bean growth and yield
compared to the fungicide Mancozeb and control treatments. Zn treatment significant
increased mean values of shoot dry weight, leaf area/plant, number of branches/plant
and seed yield/plant in both seasons. Also, it had the first grade in case of the plant
height and seed yield/fed. in the first season, only. Fe treatment significantly increased
number of pods/plant and 100-seed weight in the first season, and seed yieldHed. in the
second season. Giza 716 cv. had the highest content of chlorophyll a, chlorophyll band
ch,lorophyll a+b in both seasons. Sakha 4 cv. had the highest percentage of the seed
carbohydrates and protein contents. In case of peroxidase and polyphenol oxidase
activities, Giza 716 cv. had the first grade. Fe significantly increased chlorophyll a in the
first season and chlorophyll b and chlorophyll a + b in both seasons. Zn treatment
significantly increased seeds total carbohydrates%, total protein %, leaves peroxidase
and polyphenol oxidase activities. Sakha 1 cv. had the least chocolate spot disease
severity in the first season and Giza 716 in the second season. The three tested faba
bean cultivars sprayed with Mancozeb reduced disease severity in both seasons
followed by Fe in the first season and Zn in the second one. Data clear that there were
negative association between disease severity and peroxidase and polyphenol oxidase
activities in all cases. So it could be concluded that the used micronutrients could resist
the detrimental effects of Botrytis fabae on the plant growth and improve yield
production.

Summary in Arabic.