scholarly journals Effect of water stress at different growth stages on quantity and quality traits of Virginia (flue-cured) tobacco type

2010 ◽  
Vol 56 (No. 2) ◽  
pp. 67-75 ◽  
Author(s):  
M.H. Biglouei ◽  
M.H. Assimi ◽  
A. Akbarzadeh
Keyword(s):  
Water Stress ◽  
Block Design ◽  
Water Volume ◽  
Growth Stages ◽  
Research Station ◽  
Quality Traits ◽  
Effect Of Water ◽  
Leaf Yield ◽  
Number Of Leaves ◽  
Different Growth Stages

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 (WS<sub>0</sub>), water stress till the end of flower bud forming stage (WS<sub>1</sub>), water stress till the end of flowering stage (WS<sub>2</sub>) and full irrigation (WS<sub>3</sub>) 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 (<i>P</i> < 0.01). The interaction between year and water stress showed that the treatment of WS0 in all three experimental years significantly (<i>P</i> < 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 WS<sub>0</sub> significantly (<i>P</i> < 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 WS<sub>1</sub>, WS<sub>2</sub> and WS<sub>3</sub> were 1.223, 0.873 and 0.594 kg/m<sup>3</sup>, 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.

scholarly journals EFFECT OF WATER STRESS ON YIELD AND YIELD COMPONENTS OF BREAD WHEAT GENOTYPES.

2017 ◽  
Vol 48 (3) ◽  
Author(s):  
Mohammed & Kadhem
Keyword(s):  
Water Stress ◽  
Grain Yield ◽  
Bread Wheat ◽  
Yield Components ◽  
Block Design ◽  
Research Station ◽  
Stress Treatment ◽  
Wheat Genotypes ◽  
Effect Of Water ◽  
Yield And Yield Components

A field experiment was conducted during 2014 -2015 and 2015-2016 seasons at the  Field Crops Research Station Abu Ghraib, to study the effect of water stress, on yield and yield components of  bread wheat genotypes .The water stress treatment were 25% (S1) and 75% (S2) depletion of soil available water . The experiments was conucted using a split plot with in arrangement Randomized Complete Block Design with three replications. Water stress treatments were assigned to the main-plot, while, 27 wheat genotypes  were assigned to sub-plots. The results indicated that water stress treatment (S2)  significantly decreased  the number of spikes m-2,  number of grain.spike-1, 1000 grain weight and grain yield. The genotypes showed a differences in all characters studied. The genotype 26 produced the highest number of spikes m-2(355.8) and did not significantly differ from Bohooth10 347.2 spike.m-2.The Bohooth10 gave highest in the number of grain spike-1 (62.07) . The genotype 25 produced the highest weight of 1000 grains (40.05,37.09 gm)The genotype 26 produced highest grain yield (6.117 and 5.074 ton h-1 ) for two seasons, respectively but differed significantly from IPA99 which gave lowest  grains yield ( 3.395 and 3.020 Tun.h-1) for two seasons respectively.

scholarly journals Effect of Planting Method and Seeding Date on Leaf and Seed Production of Lettuce

2019 ◽  
pp. 1-12
Author(s):  
M. Shahinul ◽  
M. Rahman ◽  
M. M. R. Salim ◽  
B. Ahmed ◽  
M. H. Rashid
Keyword(s):  
Seed Production ◽  
Seed Yield ◽  
Block Design ◽  
Direct Seeding ◽  
Dry Matter Content ◽  
Quality Traits ◽  
Treatment Combination ◽  
Leaf Yield ◽  
Seeding Time ◽  
Planting Method

Aim: The objective of this study is to identify the suitable planting method and seeding time for leaf and seed production of lettuce. Place and Duration: A field study was carried out in Bangadandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur Bangladesh during 2012-13. Materials and Design: A commercial lettuce variety BSMRAU lettuce-1 was used in this study. The experiment was laid out in a randomized complete block design with three replications and two factors, namely planting method (M1 – transplanted seedling produced on nursery bed, M2 - transplanted seedling produced in polybag and M3 - direct seeding) and seeding time (T1 - 16 October, T2 - 1 November, T3 - 16 November, T4 - 1 December and T5 - 16 December). Results: Analyses of variance revealed with a statistically significant variation (p<0.01 or p<0.05) among the treatments. The treatment interaction revealed that the highest leaf yield 27.33 t/ha was harvested from M3T2, which was statistically similar with M2T2 (26.78 t/ha). On the other hand, the highest seed yield 412.00 kg/ha was harvested from the treatment combination of M3T2, which was statistically different from all other treatment combinations. Quality traits viz. dry matter content, fiber content and organoleptic test were also better in early seeding. Conclusion: Considering leaf yield, seed yield and quality traits, direct seeding at 1 November was found to be the most suitable treatment combination for leaf and seed production of lettuce in Bangladesh conditions. But transplanting with polybag raised seedlings may be suitable if the land is occupied by the pervious crops.

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

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

scholarly journals Soybean yield and yield components affected by the mycorrhiza and bradyrhizobium at different rates of starter nitrogen fertilizer

2017 ◽  
Vol 38 (4Supl1) ◽  
pp. 2409
Author(s):  
Mohammad Ali Aboutalebian ◽  
Masoumeh Malmir
Keyword(s):  
Nitrogen Fertilizer ◽  
Yield Components ◽  
Agricultural Research ◽  
Block Design ◽  
Fertilizer Application ◽  
Mycorrhizal Symbiosis ◽  
Research Station ◽  
Yield And Yield Components ◽  
Biological Yield ◽  
Number Of Leaves

In order to study interaction between mycorrhiza and bradyrhizobium on yield of soybean under different amounts of starter nitrogen fertilizer, a field experiment was conducted at the agricultural research station, Bu-Ali Sina University in 2015 growing season. A factorial experiment based on randomized complete block design was arranged with three replications. Experiment factors covering three levels of starter nitrogen of 0, 30 and 60 kg ha-1, bradyrhizobiumin two level of inoculated and non-inoculated and mycorrhiza including application and non-application levels. Results indicated that plant height, number of leaves per plant, yield and yield components and biological yield and mycorrhizal symbiosis percent affected by interaction of studied factors significantly. Maximum number of pod per plant achieved from combination of 30 kg Nitrogen and bradyrhizobium. Also both bio-fertilizer was able to increase number of pod per plant. Maximum 1000 seed weight obtained from inoculation of plants with bradyrhizobium and mycorrhiza simultaneously with no nitrogen utilization. Application of 60 kg ha-1 nitrogen caused to decreased mycorrhizal symbiosis about 20.22 percent in comparison with no use of starter fertilizer. Application bradyrhizobium and mycorrhiza under the application of 30 kg ha-1 nitrogen, produced the highest grain yield (511.67 g m-2) and biological yield (1223.16 g m-2).

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

1995 ◽  
Vol 43 (2) ◽  
pp. 99-111 ◽  
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.

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

2012 ◽  
Vol 92 (3) ◽  
pp. 501-507 ◽  
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.

Sign in / Sign up

Export Citation Format

Share Document