Comparative studies of the effect of microbial inoculants and inorganic chemicals on growth, yield, yield contributing traits and disease suppression in two varieties of mustard green (Brassica juncea L.) under protected structure and open field conditions in mid hills of Uttarakhand
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Date
2022-06
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College of Forestry, Ranichauri Campus, V.C.S.G. Uttarakhand University of Horticulture and Forestry
Abstract
Mustard green (Brassica juncea L.) is a popular green vegetable grown in the plains and hills of Northern India. It is a rich source of vitamins, minerals, and protein. The present investigation was conducted during Rabi-2021 at the Vegetable Research Block, College of Forestry, Ranichauri, V.C.S.G. Uttarakhand University of Horticulture and Forestry in Mustard Green (var. Local and UHF VR 12-1) with an aim to study the effect ofmicrobial inoculants and inorganic chemicals on growth, yield, yield contributing traits and disease suppression in two varieties of mustard green (Brassica juncea L.) under protected structure and open field conditions in mid hills of Uttarakhand. The experimental data for field studies were laid out in RBD comprising nine treatments and one Control, while laboratory studies were evaluated using a CRD comprising six treatments and Control. In field under open and protected structure conditions, bio-agents (Trichoderma asperellumTh-14, Pseudomonas fluorescens Psf-12, and Bacillus subtilisBs-2), fertilisers (Sulphur and Boron), and the fungicide (Ridomil Gold) were used. The treatments under laboratory conditions were comprised of Bio-agents (Th-14, Psf-12 and Bs-2), fertilizers (Boron and Sulphur) and the fungicide Ridomil Gold through the mode of application of seed treatment only for recording seed quality parameters. To study the effect of colonization of bioagents on nutritional composition of pre-colonized FYM and non- colonized FYM, three bioagents namely Th-14, Psf-12 and Bs-2 were used and non-colonized FYM served as Control for the comparative studies.
The treatment T4 (Seed bio-priming with Th-14 + FYM pre-colonized by Th-14+ one drenching at 45 days of transplanting with Th-14) recorded the highest plant height, chlorophyll content, leaf length, leaf width, number of leaves per plant, leaf yield, plant height, number of branches per plant, number of siliquae per plant, length of siliqua, and seed yield followed by T7, whereas Control, in both open and protected conditions, recorded the lowest.Similarly, T4 (Seed bio-priming with Th-14 + FYM pre-colonized by Th-14+ one drenching at 45 days of transplanting with Th-14) also showed minimum disease incidence (Damping off and Alternaria blight) and disease severity (Alternaria blight) followed by T9 whereas Control revealed maximum disease incidence and severity. In laboratory studies, maximum first count per cent, germination per cent, root, shoot and seedling length, seedling fresh and dry weight, vigour index-I and II were found when seeds were treated with T1 (Seed treatment with Trichoderma asperellum Th-14) when compared to other treatments and Control.In the study related to the nutritional composition of pre-colonized FYM and non-colonized FYM, organic carbon, nitrogen, phosphorous, and potassium content were found to be maximum in Trichoderma asperellumTh-14 pre-colonized FYM and minimum was reported in Control.
From the present investigation, it may be concluded that, seed treatment with Trichoderma asperellumTh-14 improved all the seed quality parameters in both the studied varieties of Vegetable Rai. The application of seed bio-priming with Trichoderma asperellumTh-14 + FYM pre-colonized by Th-14 was found to be the most effective and promising for enhancing growth, yield and resistance to damping off and Alternaria blight disease in Brassica juncea under both open and protected structure conditions. The nutritional composition was found to be enhanced in FYM pre-colonized with Trichoderma asperellum Th-14. When compared to open and protected conditions, the protected condition offered the best results as all the studied growth, physiological and yield parameters performed well under protected conditions. Disease incidence and severity of Alternaria blight were high in open field environments, whereas disease-free circumstances existed in protected settings. The variety UHF VR 12-1 was found best with respect to all the studied traits when compared with the local variety under present materials and environmental conditions.
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M.Sc. Agriculture