Hazarika, B.N.Daisinlung, M.Wangchu, L.2020-03-072020-03-072020-01-25http://krishikosh.egranth.ac.in/handle/1/5810144640The present experiment was conducted in the research farm of Fruit Science Department, College of Horticulture and Forestry, Pasighat to study the effect of foliar application of micronutrients on growth, yield and physicochemical attributes of aonla (Emblica officinalis Gaertn.) cv. NA-7 under the foothills of Arunachal Pradesh during the year 2018 from January till December. The treatments applied in the experiment are detailed hereunder: T1: Control, T2: Borax 0.2%, T3: ZnSO4 0.25%, T4: CuSO4 0.4%, T5: MnSO4 0.5%, T6: Borax 0.2% + ZnSO4 0.25%, T7: Borax 0.2% + CuSO4 0.4%, T8: Borax 0.2% + MnSO4 0.5 %, T9: ZnSO4 0.25% + CuSO4 0.4%, T10: ZnSO4 0.25% + MnSO4 0.5%, T11: CuSO4 0.4% + MnSO4 0.5%.The present experiment was conducted in the research farm of Fruit Science Department, College of Horticulture and Forestry, Pasighat to study the effect of foliar application of micronutrients on growth, yield and physicochemical attributes of aonla (Emblica officinalis Gaertn.) cv. NA-7 under the foothills of Arunachal Pradesh during the year 2018 from January till December. The treatments applied in the experiment are detailed hereunder: T1: Control, T2: Borax 0.2%, T3: ZnSO4 0.25%, T4: CuSO4 0.4%, T5: MnSO4 0.5%, T6: Borax 0.2% + ZnSO4 0.25%, T7: Borax 0.2% + CuSO4 0.4%, T8: Borax 0.2% + MnSO4 0.5 %, T9: ZnSO4 0.25% + CuSO4 0.4%, T10: ZnSO4 0.25% + MnSO4 0.5%, T11: CuSO4 0.4% + MnSO4 0.5%. Following results were obtained from the experiment. Significant differences were recorded in all the plant growth parameters viz. Plant height, Plant girth and Canopy spread over control. However, T6 viz. Borax 0.2% + ZnSO4 0.25% was noted to be significantly superior over all other treatments with maximum increment in plant height (0.44 m), plant girth (3.48 cm) and canopy spread in East-West direction (0.92m) while T9 viz. ZnSO4 0.25% + CuSO4 0.4% (0.83m) was found to give maximum canopy spread (N-S) among all treatments under study. Similarly, physical parameters of fruits were also significantly increased in all the treated plants as compared to control. However, maximum fruit width (3.89 cm), fruit length (3.83 cm) and fruit weight (42.14 g) were recorded with the application of treatment T6, while that of pulp: stone ratio highest in T4 (30.76). The yield parameter was recorded highest in T6 (24.36 kg/tree) and is at par with T7 (23.60 kg/tree) and T9 (22.64 kg/tree). The quality parameters of the fruits were also significantly enhanced with the application of micronutrients and the treated fruits were found superior in quality over control. The highest acidity content (1.91%) in fruit was recorded in control while the lowest acidity content (1.363%) was recorded in fruits treated with T6, at par with T7 and T9 whereas ascorbic acid content was recorded highest in T11 (539.37 mg/100g pulp) at par with T3, T4, T6 and T10 while maximum TSS (12%), Total sugar (6.18%), reducing sugar (3.45%) and non- reducing sugar (2.59%) was recorded to be highest in T6 and the lowest values noted in control. In the shelf life study, the maximum PLW (Physiological Loss in Weight) was recorded in T1 (14.83%) while the lowest value was recorded in T6 (10.83%). Correspondingly, the same observation was recorded for number of days kept in room temperature with maximum average storage days in T6 (7.00 days) and minimum average days in control (4.56 days). Thus, from the results of the experiment it can be concluded that treatment T6 viz. Borax 0.2% + ZnSO4 0.25% is the best micronutrients treatment for aonla crop cv. NA-7 and the same can be recommended to the farmers growing in large scale in the foothill regions of Arunachal Pradesh.ennullThesis