Effect of pre-harvest spray of PGRs, urea and micronutrient on growth, yield and quality of lime cv. Rangpur lime
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Date
2022-09-19
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College of Horticulture and Forestry, Central Agricultural University, Pasighat -791102
Abstract
The Present research was carried out during the year 2020-2021 at Department of Fruit Science, College of Horticulture and Forestry, Pasighat, Arunachal Pradesh. The experiment was laid out in randomized block design (RBD) with 10 treatments and 4 replications. With background study this present investigation entitled, “Effect of pre-harvest spray of PGRs, urea and micronutrient on growth, yield and quality of lime cv. Rangpur lime”.
Results in the investigation recorded significant effect on reducing fruit drop (33.47%) by increasing fruit set (41.13%) by minimizing fruit granulation (18.40%) and lowest titratable acidity in treatment T9 (NAA@ 20ppm+ GA3 @ 20ppm+ 0.5% ZnSO4+1% Urea) as compared to other treatments and control while, improvement in yield, plant reproductive and fruit physiological parameters with maximum increase in fruit retention (46.21 %) with fruit weight (171.38 g) with juice content (113.25 ml), fruit yield (129.70 kg/tree), number of fruits/tree (814.25 fruits/tree), fruit length (7.48 cm), fruit breadth (7.08 cm) was observed in the treatment T10 (NAA @ 30 ppm + GA3 @ 30 ppm + 0.5% ZnSO4+ 1% Urea). lt was also noted that bio-chemical quality parameters viz., TSS (8.55 oB), vitamin C (38.52 mg/ 100g), total sugar (3.86 %), reducing sugars (1.11 %) and were found significant increase in treatment T10¬. Non-significant results were recorded in non-reducing sugar (2.48 %) of rangpur lime in treatment (T10).
Thus, foliar spraying of T10 (NAA @ 30 ppm + GA3 @ 30 ppm + 0.5% ZnSO4 + 1% Urea) T10 may be recommended to farmers for better yield and fruit quality and T9 (NAA@ 20ppm+ GA3 @ 20ppm+ 0.5% ZnSO4+1% Urea) may be recommended for industrial purpose with minimum granulated fruits and less number of seeds per fruit. Fruits recorded with less number of seeds were stored for longer days in treatment T9 (29 days).
Description
With consideration to generating quality planting material many rootstocks used for different citrus species out of which ‘Rangpur lime’ is one of the widely used rootstock for Nagpur mandarin, sweet orange, Coorg mandarin and, Khasi Mandarin in India. Because of its tolerance to salt and drought, early fruit set, lengthy fruit retention on the tree, and resistance to the tristeza virus, the cultivar is used as a rootstock all over the world.