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Regulation of crop load and quality in sweet cherry cv. ‘Sweet Heart’ using blossom thinning Cover

Regulation of crop load and quality in sweet cherry cv. ‘Sweet Heart’ using blossom thinning

Open Access
|Sep 2024

Figures & Tables

Figure 1.

Phenological stages of sweet cherry; (A) dormant bud, (B) swollen bud, (C) green tip, (D) tight cluster, (E) white bud, (F) initial bloom, (G) final bloom, (H) petal fall.
Phenological stages of sweet cherry; (A) dormant bud, (B) swollen bud, (C) green tip, (D) tight cluster, (E) white bud, (F) initial bloom, (G) final bloom, (H) petal fall.

Figure 2.

Effect of blossom thinners on the vegetative characteristics of sweet cherry cv. ‘Sweet Heart’. ASEG, annual shoot extension growth; ATS, ammonium thiosulphate; NAA, naphthaleneacetic acid.
Effect of blossom thinners on the vegetative characteristics of sweet cherry cv. ‘Sweet Heart’. ASEG, annual shoot extension growth; ATS, ammonium thiosulphate; NAA, naphthaleneacetic acid.

Figure 3.

Effect of blossom thinners on the leaf chlorophyll content of sweet cherry cv. ‘Sweet Heart’. ATS, ammonium thiosulphate; NAA, naphthaleneacetic acid.
Effect of blossom thinners on the leaf chlorophyll content of sweet cherry cv. ‘Sweet Heart’. ATS, ammonium thiosulphate; NAA, naphthaleneacetic acid.

Figure 4.

Effect of blossom thinners on fruit set and fruit retention of sweet cherry cv. ‘Sweet Heart’. ATS, ammonium thiosulphate; NAA, naphthaleneacetic acid.
Effect of blossom thinners on fruit set and fruit retention of sweet cherry cv. ‘Sweet Heart’. ATS, ammonium thiosulphate; NAA, naphthaleneacetic acid.

Figure 5.

Effect of blossom thinners on return bloom and yield of sweet cherry cv. ‘Sweet Heart’. ATS, ammonium thiosulphate; NAA, naphthaleneacetic acid.
Effect of blossom thinners on return bloom and yield of sweet cherry cv. ‘Sweet Heart’. ATS, ammonium thiosulphate; NAA, naphthaleneacetic acid.

Effect of blossom thinners on fruit weight, increase in fruit weight, stone weight, flesh weight and fruit/stone ratio of sweet cherry cv_ ‘Sweet Heart’_

TreatmentFruit weight (g)Increase in fruit weight (%)Stone weight (g)Flesh weight (g)Fruit/stone ratio
T1 (Control)5.90 ± 0.770.000.43 ± 0.025.47 ± 0.7912.72 ± 0.27
T2 (ATS 1%)6.72 ± 0.1213.89 ± 0.240.45 ± 0.026.27 ± 0.1213.93 ± 0.81
T3 (ATS 1.5%)6.97 ± 0.1718.13 ± 0.040.44 ± 0.026.53 ± 0.1914.84 ± 1.20
T4 (ATS 2%)7.30 ± 0.1123.70 ± 0.050.45 ± 0.026.85 ± 0.0915.59 ± 0.70
T5 (NAA 20 ppm)6.70 ± 0.1813.50 ± 0.290.43 ± 0.026.26 ± 0.1514.22 ± 0.50
T6 (NAA 40 ppm)6.90 ± 0.1416.90 ± 0.250.43 ± 0.026.47 ± 0.1615.04 ± 1.30
T7 (NAA 60 ppm)7.07 ± 0.0918.60 ± 0.280.45 ± 0.026.55 ± 0.0714.71 ± 0.60
T8 (Corn oil 1%)6.50 ± 0.0810.10 ± 0.150.45 ± 0.026.05 ± 0.0813.44 ± 0.70
T9 (Corn oil 2%)6.80 ± 0.2115.20 ± 0.050.44 ± 0.036.36 ± 0.2014.45 ± 0.90
T10 (Corn oil 3%)6.87 ± 0.0916.40 ± 0.090.43 ± 0.036.44 ± 0.1014.97 ± 1.20
C.D (p ≤ 0.05)0.2820.264NS0.2800.690

Effect of blossom thinners on the chemical characteristics of sweet cherry cv_ ‘Sweet Heart’_

TreatmentSSC (°Brix)Total sugars (%)Titratable acidity (%)SSC/acid ratio
T1 (Control)17.37 ± 0.7712.82 ± 0.090.89 ± 0.0119.51 ± 1.45
T2 (ATS 1%)18.07 ± 0.3613.55 ± 0.260.87 ± 0.0120.77 ± 0.92
T3 (ATS 1.5%)18.77 ± 1.3814.57 ± 0.350.77 ± 0.0224.38 ± 2.19
T4 (ATS 2%)19.35 ± 0.6215.32 ± 0.090.74 ± 0.0226.14 ± 1.65
T5 (NAA 20 ppm)17.95 ± 0.2313.50 ± 0.080.87 ± 0.0220.63 ± 0.65
T6 (NAA 40 ppm)18.65 ± 0.6514.35 ± 0.310.80 ± 0.0223.31 ± 1.45
T7 (NAA 60 ppm)19.00 ± 0.9014.87 ± 0.250.76 ± 0.0225.00 ± 1.53
T8 (Corn oil 1%)17.45 ± 0.5313.10 ± 0.110.86 ± 0.0120.29 ± 0.80
T9 (Corn oil 2%)18.35 ± 0.2313.80 ± 0.080.88 ± 0.0120.85 ± 0.68
T10 (Corn oil 3%)18.50 ± 0.8114.10 ± 0.180.82 ± 0.0222.56 ± 1.20
C.D (p ≤ 0.05)0.1020.0610.0260.483

Effect of blossom thinners on colour intensity of sweet cherry cv_ ‘Sweet Heart’_

TreatmentL*a*b*Hue°Chroma
T1 (Control)24.46 ± 0.1129.49 ± 0.5910.71 ± 0.1819.95 ± 0.5531.28 ± 0.05
T2 (ATS 1%)23.94 ± 0.2130.93 ± 0.1512.04 ± 0.1721.25 ± 0.3933.17 ± 0.06
T3 (ATS 1.5%)23.03 ± 0.0631.84 ± 0.1312.46 ± 0.1821.35 ± 0.2934.18 ± 0.05
T4 (ATS 2%)22.98 ± 0.1032.21 ± 0.0613.25 ± 0.1222.34 ± 0.2034.81 ± 0.06
T5 (NAA 20 ppm)23.99 ± 0.1530.86 ± 0.1212.00 ± 0.3221.20 ± 0.5833.11 ± 0.09
T6 (NAA 40 ppm)23.74 ± 0.0531.75 ± 0.2012.36 ± 0.1021.25 ± 0.0734.06 ± 0.09
T7 (NAA 60 ppm)23.01 ± 0.2431.94 ± 0.1012.44 ± 0.0721.25 ± 0.1334.27 ± 0.03
T8 (Corn oil 1%)24.01 ± 0.3830.10 ± 0.1610.97 ± 0.1720.00 ± 0.3432.03 ± 0.14
T9 (Corn oil 2%)23.90 ± 0.2131.66 ± 0.2312.12 ± 0.1220.90 ± 0.3033.89 ± 0.03
T10 (Corn oil 3%)23.89 ± 0.1431.72 ± 0.1312.29 ± 0.1120.90 ± 0.5134.01 ± 0.20
C.D (p ≤ 0.05)0.2310.2230.1540.3820.081

Effect of blossom thinners on fruit volume, firmness, pedicel length and stone length of sweet cherry cv_ ‘Sweet Heart’_

TreatmentFruit volume (cm3)Fruit firmness (N)Pedicel length (mm)Stone length (mm)
T1 (Control)5.25 ± 0.503.81 ± 0.1438.19 ± 0.0111.45 ± 0.02
T2 (ATS 1%)5.90 ± 0.143.06 ± 0.1938.18 ± 0.0111.46 ± 0.02
T3 (ATS 1.5%)6.25 ± 0.502.57 ± 0.0538.20 ± 0.0211.45 ± 0.01
T4 (ATS 2%)6.55 ± 0.102.24 ± 0.1838.20 ± 0.0111.46 ± 0.01
T5 (NAA 20 ppm)5.75 ± 0.952.76 ± 0.2738.19 ± 0.0211.46 ± 0.01
T6 (NAA 40 ppm)6.22 ± 0.202.62 ± 0.3538.18 ± 0.0111.46 ± 0.02
T7 (NAA 60 ppm)6.42 ± 0.092.40 ± 0.1638.18 ± 0.0111.45 ± 0.02
T8 (Corn oil 1%)5.50 ± 0.573.25 ± 0.2038.19 ± 0.0211.46 ± 0.02
T9 (Corn oil 2%)5.92 ± 0.953.07 ± 0.2738.20 ± 0.0311.46 ± 0.01
T10 (Corn oil 3%)6.00 ± 0.012.71 ± 0.2038.19 ± 0.0211.46 ± 0.01
C.D (p ≤ 0.05)0.4060.198NSNS

Effect of blossom thinners on fruit length, diameter, thickness and L/D ratio of sweet cherry cv_ ‘Sweet Heart’_

TreatmentFruit length (mm)Fruit diameter (mm)Fruit thickness (mm)Fruit length/diameter ratio
T1 (Control)17.70 ± 0.2119.87 ± 0.1217.25 ± 0.570.89 ± 0.01
T2 (ATS 1%)18.80 ± 0.1420.97 ± 0.3317.85 ± 1.200.89 ± 0.01
T3 (ATS 1.5%)19.77 ± 0.3321.80 ± 0.4718.60 ± 0.860.90 ± 0.01
T4 (ATS 2%)22.05 ± 0.3122.85 ± 0.2319.90 ± 0.920.96 ± 0.02
T5 (NAA 20 ppm)18.65 ± 0.1720.75 ± 0.5517.75 ± 0.350.89 ± 0.02
T6 (NAA 40 ppm)19.42 ± 0.2621.75 ± 0.6118.10 ± 0.290.89 ± 0.01
T7 (NAA 60 ppm)20.85 ± 0.2622.42 ± 0.4919.80 ± 0.60.92 ± 0.02
T8 (Corn oil 1%)18.62 ± 0.1820.62 ± 0.7217.65 ± 1.400.90 ± 0.02
T9 (Corn oil 2%)19.00 ± 0.2121.40 ± 0.4017.92 ± 0.600.88 ± 0.01
T10 (Corn oil 3%)19.35 ± 0.1721.57 ± 0.4518.08 ± 0.700.89 ± 0.01
C.D (p ≤ 0.05)0.2380.4440.4410.019

Effect of blossom thinners on anthocyanin and ascorbic acid content of sweet cherry cv_ ‘Sweet Heart’_

TreatmentAnthocyanin (mg · 100 g−1)Ascorbic acid (mg · 100 g−1)
T1 (Control)18.42 ± 0.2912.22 ± 0.09
T2 (ATS 1%)19.37 ± 0.4812.72 ± 0.17
T3 (ATS 1.5%)19.77 ± 0.3813.40 ± 0.14
T4 (ATS 2%)20.87 ± 0.2913.64 ± 0.12
T5 (NAA 20 ppm)18.77 ± 0.4012.72 ± 0.17
T6 (NAA 40 ppm)19.57 ± 0.3513.30 ± 0.24
T7 (NAA 60 ppm)19.85 ± 0.2813.77 ± 0.12
T8 (Corn oil 1%)18.85 ± 0.1212.40 ± 0.14
T9 (Corn oil 2%)19.42 ± 0.2913.07 ± 0.09
T10 (Corn oil 3%)19.45 ± 0.3313.15 ± 0.12
C.D (p ≤ 0.05)0.3270.145

Chemicals and their concentrations used in different treatments_

TreatmentChemicalConcentration
T1Water spray (Control)
T2ATS1%
T3ATS1.5%
T4ATS2%
T5NAA20 ppm
T6NAA40 ppm
T7NAA60 ppm
T8Corn oil emulsion1%
T9Corn oil emulsion2%
T10Corn oil emulsion3%
DOI: https://doi.org/10.2478/fhort-2024-0020 | Journal eISSN: 2083-5965 | Journal ISSN: 0867-1761
Language: English
Page range: 311 - 321
Submitted on: Oct 18, 2023
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Accepted on: Jun 25, 2024
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Published on: Sep 9, 2024
In partnership with: Paradigm Publishing Services
Publication frequency: 2 issues per year

© 2024 Mir Uzma Parveze, Mohammad Maqbool Mir, Munib Ur Rehman, Umar Iqbal, Saba Q. Khan, F. A. Khan, Imran Khan, Sameera Qayoom, Irtiqa Mushtaq, Hamiyah K. Shah, Abdel-Rhman Z. Gaafar, Prashant Kaushik, published by Polish Society for Horticultural Sciences (PSHS)
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.