Articles
Responses of processing tomato (Solanum lycopersicum Mill) to regulated deficit irrigation under semi-arid conditions: yield and quality
Article number
1253_29
Pages
213 – 220
Language
English
Abstract
Water is one of the most limiting factors needed to sustain agricultural productivity.
It is important to determine the highest yield and quality per unit of irrigation water used.
A two year open-field experiment was conducted to study the effects of regulated deficit irrigation (RDI) on tomato paste yield and fruit quality in the semi-arid field conditions.
Irrigation treatments were conducted in a ratio of 66, 100 and 133% as determined from the amounts of total irrigation (IW)/total evaporation (CPE), for three growth stages, each at three-day intervals.
The three growth stages were classified as the first growth stage (S1) from planting up to first fruit set, the second growth stage (S2) from the first fruit set up to the first harvest, and the third growth stage (S3) from the first harvest up to the last.
Paste yield, ascorbic acid, pH, lycopene, β-carotene and total and reducing sugar were analyzed.
All examined traits related to fruit quality were affected by irrigation treatment depending on growth stages.
In both years of the experiment the highest paste yield was obtained through the highest level of irrigation (the T1 treatment). The lycopene content, varied between 24.09 and 41.54 mg 100 g‑1 in fresh fruit and 137.73 and 229.56 mg 100 g‑1 in dry fruit.
The β-carotene content in fresh and dried fruit ranged between 6.0 and 9.0 mg 100 g‑1 and 13.33 and 22.67 mg 100 g‑1, respectively.
RDI increased both reducing sugar and total sugar content.
The ascorbic acid content showed an increase with shortage irrigation.
It is important to determine the highest yield and quality per unit of irrigation water used.
A two year open-field experiment was conducted to study the effects of regulated deficit irrigation (RDI) on tomato paste yield and fruit quality in the semi-arid field conditions.
Irrigation treatments were conducted in a ratio of 66, 100 and 133% as determined from the amounts of total irrigation (IW)/total evaporation (CPE), for three growth stages, each at three-day intervals.
The three growth stages were classified as the first growth stage (S1) from planting up to first fruit set, the second growth stage (S2) from the first fruit set up to the first harvest, and the third growth stage (S3) from the first harvest up to the last.
Paste yield, ascorbic acid, pH, lycopene, β-carotene and total and reducing sugar were analyzed.
All examined traits related to fruit quality were affected by irrigation treatment depending on growth stages.
In both years of the experiment the highest paste yield was obtained through the highest level of irrigation (the T1 treatment). The lycopene content, varied between 24.09 and 41.54 mg 100 g‑1 in fresh fruit and 137.73 and 229.56 mg 100 g‑1 in dry fruit.
The β-carotene content in fresh and dried fruit ranged between 6.0 and 9.0 mg 100 g‑1 and 13.33 and 22.67 mg 100 g‑1, respectively.
RDI increased both reducing sugar and total sugar content.
The ascorbic acid content showed an increase with shortage irrigation.
Authors
N. Comlekcioglu, M. Simsek, I. Hayoglu, F. Kiroglu Zorlugenc
Keywords
lycopene, β-carotene, ascorbic acid, tomato paste, RDI
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