Effects of water stress at different growth stages on comprehensive fruit quality and yield in different bunches of tomatoes in greenhouses

A field research was carried out in the years of 2005, 2006 and 2007 in order to determine the effect of irrigation and water stress imposed at different growth stages on quantity and quality traits of Virginia tobacco plants. A randomized complete block design with four treatments and three replications was applied at the Rasht tobacco research station. Treatments were: no irrigation (dryland farming) as the complete water stress (WS0), water stress till the end of flower bud forming stage (WS1), water stress till the end of flowering stage (WS2) and full irrigation (WS3) as control in each cropping season. The combined analysis of variance showed that the effect of water stress on all the traits related to yield, quality traits and all the traits related to yield components except number of leaves, was significant (P < 0.01). The interaction between year and water stress showed that the treatment of WS0 in all three experimental years significantly (P < 0.05) affected the fresh and dry leaf yield, plant height and sugar and nicotine percentage. The comparison of means of three years (average of three years) also revealed that the treatment of WS0 significantly (P < 0.05) affected all of the traits which were related to tobacco quantity and quality except for the number of leaves. Moreover, the level of water productivity in recognition of each water volume unit for three experimental years for the treatments of WS1, WS2 and WS3 were 1.223, 0.873 and 0.594 kg/m3, respectively, in the case of average dry leaf yield. Consequently, the results indicate that with optimizing irrigation application we can reach the higher level of productivity.

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Wheat response to water stress condition at different growth stages in Amibara, Ethiopia

African Journal of Agricultural Research ◽

10.5897/ajar2019.13919 ◽

2019 ◽

Vol 14 (32) ◽

pp. 1493-1498

Author(s):

M. Hassen Jemal ◽

T. Wondimu ◽

R. Borena Fikadu ◽

N. Kebede ◽

A. Niguse ◽

...

Keyword(s):

Water Stress ◽

Stress Condition ◽

Growth Stages ◽

Water Stress Condition ◽

Response To Water ◽

Different Growth Stages

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SENSITIVITY OF CROP PLANTS TO WATER STRESS AT SPECIFIC DEVELOPMENTAL STAGES: REEVALUATION OF EXPERIMENTAL FINDINGS

Israel Journal of Plant Sciences ◽

10.1080/07929978.1995.10676596 ◽

1995 ◽

Vol 43 (2) ◽

pp. 99-111 ◽

Cited By ~ 17

Author(s):

Zvi Plaut

Keyword(s):

Water Stress ◽

Irrigation Water ◽

Field Experiments ◽

Developmental Stages ◽

Growth Period ◽

Soluble Solids ◽

Growth Stages ◽

Mild Stress ◽

Uniform Reduction ◽

Different Growth Stages

It has been suggested that in many crops differences in sensitivity to water stress occur at different growth stages. Since identical amounts of water may be applied, irrespective of whether a crop is exposed to relatively severe and short periods of stress or to extended periods of mild stress, the responses to such differing conditions should be compared. Unfortunately, such a comparison has not been conducted in most studies on sensitivity to water stress at different growth stages. In the present study, based on three field experiments conducted for different purposes, such a comparison was made for three crops: corn, sunflower, and tomato. In corn, distinct responses of ear and kernel yields to the timing of water stress were found. Withdrawal of irrigation water during flowering and cob formation resulted in greater yield losses than during other stages, indicating that this is a critical growth stage. However, slight and uniform reduction of water during the entire growth period resulted in significantly less damage to kernel or ear production, although the total amount of water applied was similar to that under staged withdrawal. In sunflowers, the withdrawal of irrigation water even at noncritical growth stages caused a more marked reduction in grain yield than did a uniform reduction throughout the entire season. In tomatoes, on the other hand, the withdrawal of irrigation water during specific growth stages caused minimal damage to fruit and total soluble solids yield as compared with fully irrigated control; reduction of irrigation water throughout the season brought about a significant decrease in yield. The difference between these crops is interpreted on the basis of the determinance of their floral meristems.

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Response to water stress of soil enzymes and root exudates from drought and non-drought tolerant corn hybrids at different growth stages

Canadian Journal of Soil Science ◽

10.4141/cjss2010-057 ◽

2012 ◽

Vol 92 (3) ◽

pp. 501-507 ◽

Cited By ~ 35

Author(s):

Fengbin Song ◽

Xiying Han ◽

Xiancan Zhu ◽

Stephen J. Herbert

Keyword(s):

Alkaline Phosphatase ◽

Water Stress ◽

Osmotic Stress ◽

Root Exudates ◽

Soil Enzymes ◽

Growth Stages ◽

Corn Hybrids ◽

Drought Tolerant ◽

Response To Water ◽

Different Growth Stages

Song, F., Han, X., Zhu, X. and Herbert, S. J. 2012. Response to water stress of soil enzymes and root exudates from drought and non-drought tolerant corn hybrids at different growth stages. Can. J. Soil Sci 92: 501–507. Drought tolerant corn hybrids (Zea mays L.) are an excellent model to evaluate the effect of water stress on rhizosphere functions. The purpose of this study was to investigate the influences of water stress on soil pH, enzyme activities, and root exudates from corn. Two corn hybrids, Baidan 9 (drought tolerant) and Baidan 31 (non-drought tolerant) were grown in soil-filled pots for pH and enzyme assays and in hydroponics culture for root exudate analysis. Water stress was imposed at four growth stages: seedling, elongation, tasseling and grain-filling stages. Soil pH was lower in the rhizosphere than bulk soil, but was not affected by water deficiency. Water stress increased protease activity at the seedling stage, but reduced its activities at other stages compared to the control. A significant positive correlation was observed between pH and alkaline phosphatase activity under water stress. Compared to Baidan 31, the rhizosphere of drought-tolerant Baidan 9 had greater protease and catalase activities at all growth stages, greater alkaline phosphatase, lower acid phosphatase and greater invertase activities at elongation, tasseling and filling stages. Osmotic stress increased the organic acid concentration (malic, lactic, acetic, succinic, citric and maleic acids) in root exudates of Baidan 9 and Baidan 31; as well there was a greater fumaric acid concentration in Baidan 31 under osmotic stress than without stress. The increased soil enzyme activities and organic acids exuded from the rhizosphere of plants under water stress might contribute to drought tolerance in corn hybrids.

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