:Banana requires large quantities of nutrients for sustaining its production apart from its growth and development. As banana is a large plant with bigger size of the leaves, it exhausts major and minor elements from the soil in larger quantities and the soils require a continuous replenishment of nutrients. Banana being an exhaustive crop, proper manuring and fertilizer application has to be done for obtaining good yields, with better quality fruits. The inorganic nutrients are absorbed by the plants in readily assimilable form whereas the organic manures take time for distribution of nutrients as they need to undergo decomposition in soil. Application of inorganic fertilizers in split doses along with organic manures in combination with biofertilizers in an integrated manner is the best practice for sustaining production, yield and quality in banana as the indiscriminate usage of inorganic fertilizers deteriorates the soil health through volatilization and mineralization and causes loss of nutrients through leaching besides polluting the environment.
Cultivation of 'Red Globe' grapes are gaining popularity in India's mild tropical climate owing to its bold berries, attractive red colour, and better shelf life, thus fetching a better price in the market. 'Dogridge' is the preferred rootstock in India because of its wide adaptability to different soils and climatic conditions, besides its tolerance to drought and salinity. Though most of the commercial grape varieties are grafted on 'Dogridge' rootstock, the success of grafting 'Red Globe' onto 'Dogridge' is little, or it needs repeated grafting for vineyard establishment. Hence, to improve the grafting success on 'Dogridge' rootstock, we tried different combinations of scion treatments. The scions were treated with cytokinin compounds like kinetin or benzyl amino purine (BAP) or a combination of hormones with scion preconditioning or etiolating and compared with the control. Among these treatments, scions preconditioned on mother vines for five days combined with treating them with BAP @ 100 ppm for 60 seconds before grafting, improved the grafting success to 68%. Biochemical and enzyme studies also indicated higher activity of antioxidant enzymes like peroxidase and polyphenol oxidase in the same treatment. Scion preconditioning and BAP treatment helped better callus production and vascular connectivity between stock and scion, contributing to better graft success. The role of biochemical parameters and antioxidant enzymes in improving graft success has been discussed.
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