Influence of rootstocks on growth, yield and fruit quality of Kinnow mandarin
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Date
2021
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Punjab Agricultural University, Ludhiana
Abstract
The present study entitled "Influence of rootstocks on growth, yield and fruit quality of
Kinnow mandarin" was carried out during 2020-21 in the Department of Fruit Science,
Punjab Agricultural University, Ludhiana. Kinnow mandarins budded on six rootstocks viz.
Kuharske, Rich 16-6, Swingle, Troyer, Carrizo, and Rough Lemon were used in this study.
Carrizo rootstock had the highest mean rootstock: scion diameter ratio (0.94), followed by
Rough Lemon (0.92), significantly greater than all other rootstocks. However, the bark
thickness of rootstock and scion was significantly higher in Troyer (2.1 mm) and Swingle (2.1
mm) rootstocks, respectively. The largest tree canopy volume of Kinnow trees was recorded
on Carrizo rootstock (10.89 m3), significantly higher than all other rootstocks. However, the
least was recorded on Swingle rootstock (2.25 m3). The mean fruit weight and fruit yield of
Kinnow were significantly higher on Carrizo (186.25 g, 68.27 kg/tree), followed by Rough
Lemon (168.58 g, 63.62 kg/tree), which were significantly higher than all other rootstocks.
Swingle rootstock had the highest mean yield efficiency (9.77 kg/m3) compared with
different rootstocks. A significantly higher photosynthesis rate was recorded on Carrizo
(5.41μmol m-2 s-1). Kinnow trees had the highest fruit TSS/acidity (12.94) and juice content
(52.5%) budded on Carrizo (12.94), followed by Rough Lemon (11.85, 50.2%) rootstock,
which was significantly higher than all other rootstocks. However, Kinnow fruits on Rough
Lemon recorded the highest ascorbic acid levels ((31.10 mg/100ml juice), and it was at par
with Carrizo (30.25mg/100ml juice). Citrus Colour Index (CCI) values for fruit epicarp, pulp,
and juice were the highest on Swingle (24.7), Troyer (11.3), and Carrizo (11.1), respectively,
which indicated that these rootstocks had higher colour development. The leaf macro and
micronutrient levels were also varied in Kinnow tree budded on different rootstocks.
Nitrogen, phosphorous, and potassium contents were higher in Rich 16-6 (2.45 %), Troyer
and Rich 16-6 (0.18 %), and Troyer (0.94%), respectively. The magnesium, zinc, calcium,
and iron contents were maximum in Kinnow leaves budded on Swingle rootstock. However,
Carrizo recorded significantly higher Mn (54.17 ppm) content. The study concluded that
Carrizo and Rough Lemon rootstock are promising rootstocks for Kinnow mandarin for
higher fruit quality and yield. Furthermore, Swingle rootstock is highly dwarf rootstock for
having higher yield efficiency and better fruit colour development.
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Citation
Mashaal, Jamaluddin (2021). Influence of rootstocks on growth, yield and fruit quality of Kinnow mandarin (Unpublished M.Sc. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.