Influence of nitrogen levels, vermicompost and Azotobacter on phenology, yield and quality attributes of mango (Mangifera indica L.) cv. Amrapali under high density planting
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Date
2018-09-27
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Department of Horticulture (Pomology), BAU, Sabour
Abstract
Mango (Mangifera indica L.) of family Anacardiaceae is one of the most popular fruit of the tropical and sub-tropical region. In recent years high density planting is being promoted due to higher income per unit area. The high density planting is achieved by closer planting of 3.0 m X 2.5m in place of traditional planting distance of 10m×10m using dwarf varieties like Amrapali. The closer planting along with other cultural practices enhance the use efficiency of resources like land, water, fertilizer and solar radiation to its maximum potential. Application of vermicompost and bio fertilizer has been found to be beneficial in different fruit crops. Also, application of inorganic fertilizers like N, P and K are need to be standardize under high density planting. Thus, present investigation was undertaken with the objectives to standardize the nitrogen requirement of mango under high-density planting and to study the effect of levels of nitrogen, vermicompost and Azotobacter on phenology, yield and quality attributes of mango under high-density planting.
The experiment was laid out in factorial randomized block design with three replications as three factors namely nitrogen, vermicompost and Azotobacter. The four levels of nitrogen (60g, 80g, 100g, 120 g/plant), three levels of vermicompost (0 kg/tree, vermicompost @ 4.0 kg/plant and in-situ vermicomposting) and two levels of Azotobacter (0 g/tree and Azotobactor @ 200 g/plant) were taken for the experiment. The maximum fruit set (17.97%) was found with combined application of nitrogen 100 g/tree + vermicompost @ 4.0 kg/tree + Azotobacter @ 200 g/tree (N3×V1×A1). The heaviest fruit of 203.85 g was found with combined application of nitrogen @ 120 g/tree + in-situ vermicomposting along with Azotobacter @ 200 g/tree which was statistically equal with nitrogen @120g/tree + in-situ vermicomposting in the absence of Azotobacter and nitrogen @120g/tree + vermicomposting @ 4.0 kg/tree in the absence of Azotobacter. The highest number of fruits/plant (82.35) was noted with the application of interaction of nitrogen @ 100 g/tree along with vermicompost @ 4.0 kg/tree. The plant supplied with nitrogen @ 100 g/tree along with vermicomposting @ 4.0 kg/tree and Azotobacter @ 200g/tree (N3×V1×A1), gave the maximum TSS/acidity ratio (185.12), total carotenoid (18.75 mg/100g pulp) and total sugars (18.31 %). Soil health in terms of organic carbon, pH and nutrient content and microbial population improved with the application of nitrogen @ 120g + in-situ vermicomposting along with Azotobactor @ 200 g/plant.