EFFECTS OF SOIL SALINITY LEVELS AND PLANT WATER STRESS AT VARIOUS SOYBEAN GROWTH STAGES

1977 ◽  
Vol 57 (3) ◽  
pp. 925-927 ◽  
Author(s):  
A. R. SEPASKHAH
Keyword(s):  
Water Stress ◽  
Yield Components ◽  
Seed Weight ◽  
Growth Stages ◽  
Plant Water ◽  
Plant Water Stress ◽  
Greenhouse Study ◽  
Salinity Levels ◽  
Glycine Max L ◽  
100 Seed Weight

The effects of plant water stress at flower induction, flowering, podding and pod-filling stages on yield and yield components of soybean (Glycine max (L.) Merr.) were determined at three salinity levels in a greenhouse study. At all salinity levels, plant water stress was more critical in the pod-filling stage, and reduced seed yield and 100-seed weight.

scholarly journals Higher flower and seed number leads to higher yield under water stress conditions imposed during reproduction in chickpea

2015 ◽  
Vol 42 (2) ◽  
pp. 162 ◽  
Author(s):  
Raju Pushpavalli ◽  
Mainassara Zaman-Allah ◽  
Neil C. Turner ◽  
Rekha Baddam ◽  
Mandali V. Rao ◽  
...  
Keyword(s):  
Water Stress ◽  
Seed Yield ◽  
Yield Components ◽  
Seed Weight ◽  
Relative Yield ◽  
Seed Number ◽  
Flower Number ◽  
Total Seed ◽  
100 Seed Weight ◽  
Pod Number

The reproductive phase of chickpea (Cicer arietinum L.) is more sensitive to water deficits than the vegetative phase. The characteristics that confer drought tolerance to genotypes at the reproductive stage are not well understood; especially which characteristics are responsible for differences in seed yield under water stress. In two consecutive years, 10 genotypes with contrasting yields under terminal drought stress in the field were exposed to a gradual, but similar, water stress in the glasshouse. Flower number, flower + pod + seed abortion percentage, pod number, pod weight, seed number, seed yield, 100-seed weight (seed size), stem + leaf weight and harvest index (HI) were recorded in well watered plants (WW) and in water-stressed plants (WS) when the level of deficit was mild (phase I), and when the stress was severe (phase II). The WS treatment reduced seed yield, seed and pod number, but not flower + pod + seed abortion percentage or 100-seed weight. Although there were significant differences in total seed yield among the genotypes, the ranking of the seed yield in the glasshouse differed from the ranking in the field, indicating large genotype × environment interaction. Genetic variation for seed yield and seed yield components was observed in the WW treatment, which also showed differences across years, as well as in the WS treatment in both the years, so that the relative seed yield and relative yield components (ratio of values under WS to those under WW) were used as measures of drought tolerance. Relative total seed yield was positively associated with relative total flower number (R2 = 0.23 in year 2) and relative total seed number (R2 = 0.83, R2 = 0.79 in years 1 and 2 respectively). In phase I (mild stress), relative yield of seed produced in that phase was found to be associated with the flower number in both the years (R2 = 0.69, R2 = 0.76 respectively). Therefore, the controlled drought imposition that was used, where daily water loss from the soil was made equal for all plants, revealed genotypic differences in the sensitivity of the reproductive process to drought. Under these conditions, the seed yield differences in chickpea were largely related to the capacity to produce a large number of flowers and to set seeds, especially in the early phase of drought stress when the degree of water deficit was mild.

scholarly journals Leaf compatible “eco-friendly” temperature sensor clip for high density monitoring wireless networks

2017 ◽  
Vol 4 (1) ◽  
pp. 55-60 ◽  
Author(s):  
Valeria Palazzari ◽  
Paolo Mezzanotte ◽  
Federico Alimenti ◽  
Francesco Fratini ◽  
Giulia Orecchini ◽  
...  
Keyword(s):  
Decision Support ◽  
Water Stress ◽  
Temperature Sensor ◽  
Irrigation System ◽  
Fuel Oil ◽  
Plant Water ◽  
Temperature Differential ◽  
Water Pump ◽  
Plant Water Stress ◽  
System A

This paper describes the design, realization, and application of a custom temperature sensor devoted to the monitoring of the temperature differential between the leaf and the air. This difference is strictly related to the plant water stress and can be used as an input information for an intelligent and flexible irrigation system. A wireless temperature sensor network can be thought as a decision support system used to start irrigation when effectively needed by the cultivation, thus saving water, pump fuel oil, and preventing plant illness caused by over-watering.

scholarly journals Reducing the Excessive Evaporative Demand Improved the Water-use Efficiency of Greenhouse Cucumber by Regulating the Trade-off between Irrigation Demand and Plant Productivity

HortScience ◽  
2018 ◽  
Vol 53 (12) ◽  
pp. 1784-1790 ◽  
Author(s):  
Dalong Zhang ◽  
Yuping Liu ◽  
Yang Li ◽  
Lijie Qin ◽  
Jun Li ◽  
...  
Keyword(s):  
Water Stress ◽  
Water Use Efficiency ◽  
Water Flow ◽  
Water Use ◽  
Plant Productivity ◽  
Plant Water ◽  
Evaporative Demand ◽  
Plant Water Stress ◽  
Irrigation Demand ◽  
Use Efficiency

Although atmospheric evaporative demand mediates water flow and constrains water-use efficiency (WUE) to a large extent, the potential to reduce irrigation demand and improve water productivity by regulating the atmospheric water driving force is highly uncertain. To bridge this gap, water transport in combination with plant productivity was examined in cucumber (Cucumis sativus L.) grown at contrasting evaporative demand gradients. Reducing the excessive vapor pressure deficit (VPD) decreased the water flow rate, which reduced irrigation consumption significantly by 16.4%. Reducing excessive evaporative demand moderated plant water stress, as leaf dehydration, hydraulic limitation, and excessive negative water potential were prevented by maintaining water balance in the low-VPD treatment. The moderation of plant water stress by reducing evaporative demand sustained stomatal function for photosynthesis and plant growth, which increased substantially fruit yield and shoot biomass by 20.1% and 18.4%, respectively. From a physiological perspective, a reduction in irrigation demand and an improvement in plant productivity were achieved concomitantly by reducing the excessive VPD. Consequently, WUE based on the criteria of plant biomass and fruit yield was increased significantly by 43.1% and 40.5%, respectively.

Is the Keetch–Byram drought index (KBDI) directly related to plant water stress?

2006 ◽  
Vol 234 ◽  
pp. S27 ◽  
Author(s):  
Gavriil Xanthopoulos ◽  
Georgios Maheras ◽  
Vassiliki Gouma ◽  
Markos Gouvas
Keyword(s):  
Water Stress ◽  
Drought Index ◽  
Plant Water ◽  
Plant Water Stress
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