Impact of soil and foliar application of boron on physiological aspects of cabbage (Brassica oleracea var. capitata L.)
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Date
2019
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Orissa University of Agriculture and Technology, Bhubaneswar
Abstract
A field experiment entitled “Impact of soil and foliar application of boron on physiological aspects of cabbage (Brassica oleracea var. capitata L.)” was conducted in AICRP on micronutrient at central farm of OUAT, Bhubaneswar during Rabi-2018. The ten number of treatments on borax fertilizer mixed with recommended dose of fertilizer was fitted in a randomized block design with three replications. Cabbage cultivar 'Swara-F1' was sown in the field and treated with soil application of B@1.0kg/ha and different frequencies of foliar spraying @0.25%, 0.5%, 0.75% and 1.0% in the form of borax at mid (45 DAT) and late (75 DAT) crop growth stages. Observations on plant height, leaf number, leaf area plant-1, chlorophyll index by SPAD, were recorded from 45 DAT in 15 days interval till harvest. Biochemical parameters on chlorophyll, carotenoid, carbohydrate, protein and proline content, along with quality parameters like ascorbic acid, flavonoids, niacin and riboflavin content were estimated at head initiation and harvest stage. Boron content and uptake, NPK estimation, relative growth rate, crop growth rate, dry matter partitioning and yield attributes were determined during the course of investigation and were statistically analyzed. The data revealed that growth parameters like plant height, leaf number, leaf area plant-1, chlorophyll index by SPAD, relative growth rate, crop growth rate, dry matter partitioning was increased maximum at FS @0.5% borax twice was followed by soil application B@ 1.0 kg ha-1. Various biochemical, quality and yield parameters showed superiority at FS@ 0.5% borax twice at critical stages of cabbage plant. All the characters showed significantly positive correlation with yield except proline which was negatively correlated. This confirmed that boron facilitates the translocation of assimilates towards the economic sink. Moreover a reduction in growth, yield and quality of cabbage was observed when the plants were treated with higher concentration of B in the form of borax at FS@0.75% to 1.0% once/twice as visible toxic symptoms of leaf burning was marked. Boron retention is lowest in acid soils, but increases rapidly in the soil pH range of 5.7 to 6.1, indicating that Boron availability to plant is dependent on soil pH. The above findings suggest that the use of boron to foliage is more effective than soil application because boron is utilized by the plant right at the site where they are used as quite fast acting. Consequently, this study will help to understand the interaction between different frequencies of boron as foliar spray will with soil application and the productivity of cabbage crop.
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Th-5674
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