Singh, S. RomenDevi Senjam, BidyaraniHazarika, B.N.2018-07-072018-07-072018-06-21http://krishikosh.egranth.ac.in/handle/1/5810058004The present investigation was conducted to evaluate the effect of foliar application of different plant growth regulators (PGR) and urea on Assam Lemon. It was carried out on 7 years old trees of uniform size at the Fruit Research Farm, Department of Fruit Science, College of Horticulture and Forestry, Pasighat, Arunachal Pradesh during the Winter and Summer seasons of the year 2017. The experiment was laid out in Randomized Block Design (RBD) with 9 treatments and 5 replications. The treatments applied were: T1 (NAA @ 10 ppm + 1% urea), T2 (2,4-D @ 10 ppm + 1% urea), T3 (NAA @ 20 ppm + 1% urea), T4 (2,4-D @ 20 ppm + 1% urea), T5 (NAA @ 10 ppm + 2,4-D @ 10 ppm + 1% urea), T6 (NAA @ 20 ppm + 2,4-D @ 20 ppm + 1% urea), T7 (NAA @ 10 ppm + 2,4-D @ 10 ppm), T8 (NAA @ 20 ppm + 2,4-D @ 20 ppm) and T9 (Control).The present investigation was conducted to evaluate the effect of foliar application of different plant growth regulators (PGR) and urea on Assam Lemon. It was carried out on 7 years old trees of uniform size at the Fruit Research Farm, Department of Fruit Science, College of Horticulture and Forestry, Pasighat, Arunachal Pradesh during the Winter and Summer seasons of the year 2017. The experiment was laid out in Randomized Block Design (RBD) with 9 treatments and 5 replications. The treatments applied were: T1 (NAA @ 10 ppm + 1% urea), T2 (2,4-D @ 10 ppm + 1% urea), T3 (NAA @ 20 ppm + 1% urea), T4 (2,4-D @ 20 ppm + 1% urea), T5 (NAA @ 10 ppm + 2,4-D @ 10 ppm + 1% urea), T6 (NAA @ 20 ppm + 2,4-D @ 20 ppm + 1% urea), T7 (NAA @ 10 ppm + 2,4-D @ 10 ppm), T8 (NAA @ 20 ppm + 2,4-D @ 20 ppm) and T9 (Control). Experimental results revealed that the imposition of different treatments had a significant effect on reducing fruit drop and improving the yield and quality of the fruits. Maximum number of fruits/plant at harvesting stage (67.60), yield/plant (8.29 kg), fruit length (8.84 cm), fruit diameter (5.36 cm), fruit fresh weight (118.68 g/fruit), pulp content (81.58 g/fruit), juice content (40.47 ml/fruit), reducing sugar (0.51%), ascorbic acid (48.56 mg/100 g) with minimum fruit drop (13.91%) was recorded by treatment T6 (NAA @ 20 ppm + 2,4-D @ 20 ppm + 1% urea) whereas, maximum TSS (9.880B), total sugar (1.66%) with minimum titratable acidity (3.10%) was recorded by treatment T5 (NAA @ 10 ppm + 2,4-D @ 10 ppm + 1% urea). However, non-significant effect was found in plant height, canopy spread and shelf life parameters. Therefore, application of recommended dose of fertilizers (100:100:100g NPK/plant/year) along with foliar spray of NAA @ 20 ppm + 2,4-D @ 20 ppm + 1% urea twice (two weeks after fruit setting and fully developed stage) can be recommended to the Assam Lemon growers to increase the yield and productivity.ennullThesis