Studies on nature of fruit drop, yield and quality of Kinnow mandarin
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Date
2022-12
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Chaudhary Charan Singh Haryana Agricultural University hisar
Abstract
The experiment entitled “Studies on nature of fruit drop, yield and quality of Kinnow mandarin” was conducted at the experimental orchard, Department of Horticulture, CCS Haryana Agricultural University, Hisar during 2019-20 and 2020-21 to find out the best concentration of foliar application of growth regulators, nutrients and fungicides in improvement of growth, yield, quality and nutrient status of leaves. There were eighteen treatments, i.e., 2,4-D 10 ppm, 2,4-D 15 ppm, GA3 15 ppm, GA3 20 ppm, Urea 1%, Urea 1.5%, Zinc Sulphate 0.5%, Zinc Sulphate 0.75%, Bavistin 1000 ppm and their combinations with three replications by taking one replication per plant on 9-year-old Kinnow plants.
The foliar application of growth regulators, nutrients and fungicides treatments and their combinations had significant effect on fruit drop, growth, yield and quality of Kinnow mandarin. Foliar application of 2,4-D 15 ppm + Urea 1.5% + Zinc Sulphate 0.75% + Bavistin 1000 ppm in Kinnow mandarin recorded lower June fruit drop in the order of 13.65% and 15.77% during 2019-20 and 2020-21, respectively and pre-harvest drop in the order of 25.65% and 34.21% during 2019-20 and 2020-21, respectively as compared to control. The growth parameters i.e., plant spread, trunk diameter, leaf area, fruit retention and leaf chlorophyll content were found maximum with foliar application of 2,4-D 15 ppm + Urea 1.5% + Zinc Sulphate 0.75% + Bavistin 1000 ppm. Plant height, fruit length, fruit breadth and fruit weight were effectively improved by foliar application of GA3 20 ppm + Urea 1.5% + Zinc Sulphate 0.75% + Bavistin 1000 ppm. Foliar application of 2,4-D 15 ppm + Urea 1.5% + Zinc Sulphate 0.75% + Bavistin 1000 ppm was significantly improved number of fruits per tree and yield. Kinnow mandarin fruits sprayed with 2,4-D 15 ppm + Urea 1.5% + Zinc Sulphate 0.75% + Bavistin 1000 ppm resulted in 27.42% and 30.64% higher yield during 2019-20 and 2020-21, respectively as compared to control. Kinnow fruit quality in terms of TSS, acidity, TSS/acid ratio, ascorbic acid, juice content, rag content, peel content and peel thickness were significantly affected by foliar application of 2,4-D 15 ppm + Urea 1.5% + Zinc Sulphate 0.75% + Bavistin 1000 ppm. Number of seeds per fruit and seed weight were not significantly affected by foliar application. Maximum leaf N, Zn, S and Fe were recorded with foliar spray of 2,4-D 15 ppm + Urea 1.5% + Zinc Sulphate 0.75% + Bavistin 1000 ppm, however leaf P and K were not significantly affected by foliar application of plant growth regulators, nutrients and fungicides.