Water stress indicators and stress functions to calculate soil water depletion in deficit irrigated grapevine and kiwi

2017 ◽  
pp. 119-126 ◽  
Author(s):  
M.I. Ferreira ◽  
N. Conceição ◽  
A.C. Malheiro ◽  
J.M. Silvestre ◽  
R.M. Silva
Keyword(s):  
Water Stress ◽  
Soil Water ◽  
Soil Water Depletion ◽  
Stress Indicators ◽  
Water Depletion ◽  
Stress Functions

scholarly journals Effects of soil water depletion on the water relations in tropical kudzu

1999 ◽  
Vol 34 (7) ◽  
pp. 1151-1157
Author(s):  
Adaucto Bellarmino de Pereira-Netto ◽  
Antonio Celso Novaes de Magalhães ◽  
Hilton Silveira Pinto
Keyword(s):  
Water Stress ◽  
Stomatal Conductance ◽  
Water Content ◽  
Soil Water ◽  
Cover Crop ◽  
Soil Water Depletion ◽  
Pueraria Phaseoloides ◽  
Water Depletion ◽  
Relative Water ◽  
Dry Soil

Tropical kudzu (Pueraria phaseoloides (Roxb.) Benth., Leguminosae: Faboideae) is native to the humid Southeastern Asia. Tropical kudzu has potential as a cover crop in regions subjected to dryness. The objective of this paper was to evaluate the effect of soil water depletion on leaflet relative water content (RWC), stomatal conductance (g) and temperature (T L) in tropical kudzu. RWC of waterstressed plants dropped from 96 to 78%, following a reduction in SWC from 0.25 to 0.17 g (H2O).g (dry soil)-1.Stomatal conductance of stressed plants decreased from 221 to 98 mmol.m-2.s-1, following the reduction in soil water content (SWC). The day after re-irrigation, g of water stressed plants was 15% lower than g of unstressed plants. Differences in T L between waterstressed and unstressed plants (deltaT L) rose linearly from 0.1 to 2.2ºC following progressive water deficit. RWC and T L of waterstressed plants paralled RWC and T L of unstressed plants the day after reirrigation. The strong decrease in SWC found in this study only induced moderate water stress in tropical kudzu. In addition, tropical kudzu recover rapidly from the induced water stress after the re-irrigation.

scholarly journals Identifying Within-Field Spatial and Temporal Crop Water Stress to Conserve Irrigation Resources with Variable-Rate Irrigation

Agronomy ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1377
Author(s):  
Jeffrey D. Svedin ◽  
Ruth Kerry ◽  
Neil C. Hansen ◽  
Bryan G. Hopkins
Keyword(s):  
Electrical Conductivity ◽  
Water Stress ◽  
Soil Water ◽  
Variable Rate ◽  
Soil Electrical Conductivity ◽  
Soil Water Depletion ◽  
Crop Water ◽  
Water Depletion ◽  
Crop Water Stress ◽  
Variable Rate Irrigation

Addressing within-field and within-season variability of crop water stress is critical for spatially variable irrigation. This study measures interactions between spatially variable soil properties and temporally variable crop water dynamics; and whether modelling soil water depletion is an effective approach to guide variable-rate irrigation (VRI). Energy and water balance equations were used to model crop water stress at 85 locations within a 22 ha field of winter wheat (Triticum aestivum L.) under uniform and spatially variable irrigation. Significant within-field variability of soil water holding capacity (SWHC; 145–360 mm 1.2 m−1), soil electrical conductivity (0.22–49 mS m−1), spring soil water (314–471 mm 1.2 m−1), and the onset of crop water stress were observed. Topographic features and modelled onset of crop water stress were significant predictors of crop yield while soil moisture at spring green-up, elevation, and soil electrical conductivity were significant predictors of the onset of crop water stress. These results show that modelling soil water depletion can be an effective scheduling tool in VRI. Irrigation zones and scheduling efforts should consider expanding to include temporally dynamic factors, including spring soil water content and the onset of crop water stress.

Soil water depletion patterns of artificial forest species and ages on the Loess Plateau (China)

2018 ◽  
Vol 417 ◽  
pp. 137-143 ◽  
Author(s):  
Yu Liu ◽  
Hai-Tao Miao ◽  
Ze Huang ◽  
Zeng Cui ◽  
Honghua He ◽  
...  
Keyword(s):  
Soil Water ◽  
Loess Plateau ◽  
Soil Water Depletion ◽  
Forest Species ◽  
The Loess Plateau ◽  
Water Depletion

Irrigation Scheduling with Planned Soil Water Depletion

1994 ◽  
Vol 37 (5) ◽  
pp. 1491-1497 ◽  
Author(s):  
F. R. Lamm ◽  
D. H. Rogers ◽  
H. L. Manges
Keyword(s):  
Soil Water ◽  
Irrigation Scheduling ◽  
Soil Water Depletion ◽  
Water Depletion

scholarly journals Double-Double Row Planting Mode at Deficit Irrigation Regime Increases Winter Wheat Yield and Water Use Efficiency in North China Plain

Agronomy ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1315
Author(s):  
Xun Bo Zhou ◽  
Guo Yun Wang ◽  
Li Yang ◽  
Hai Yan Wu
Keyword(s):  
Winter Wheat ◽  
Soil Water ◽  
Water Use ◽  
Deficit Irrigation ◽  
Water Status ◽  
Row Spacing ◽  
Soil Water Depletion ◽  
Double Row ◽  
Water Depletion ◽  
Use Efficiency

Low water availability coupled with poor planting method has posed a great challenge to winter wheat (Triticum aestivum L.) productivity. To improve productivity and water use efficiency (WUE) under deficit irrigation, an effective water-saving technology that is characterized by three planting modes has been developed (uniform with 30-cm row spacing (U), double-double row spacing of 5 cm (DD), and furrow-ridge row spacing of alternated 20 cm and 40 cm (F)) combined with three irrigation regimes (50 mm water each at growth stage 34 (GS34) and GS48 (W1), and 100 mm water at GS48 (W2), or 100 mm each water at GS34 and GS48 (W3)). Results showed that DD increased yield by 9.7% and WUE by 12.6% due to higher soil water status and less soil water depletion and evapotranspiration compared with U. Although the soil water status, soil water depletion, evapotranspiration, and yield increased with increasing irrigation amount, more soil water depletion and evapotranspiration resulted in low WUE. The deficit irrigation was beneficial for improving WUE as W1 had significantly increased yield by 5.4% and WUE by 7.1% compared with W2. Yield and evapotranspiration showed a quadratic dynamic equation indicating that yield increased with increasing evapotranspiration. Considering WUE and relatively higher yield under deficit water, W1 combined with DD is suggested to be a good management strategy to be applied in winter wheat of water-scarce regions.

Soil Water Depletion and Root Distribution of Three Dryland Crops

2005 ◽  
Vol 69 (1) ◽  
pp. 197 ◽  
Author(s):  
T. S. Moroke ◽  
R. C. Schwartz ◽  
K. W. Brown ◽  
A. S. R. Juo
Keyword(s):  
Soil Water ◽  
Root Distribution ◽  
Soil Water Depletion ◽  
Water Depletion ◽  
Dryland Crops

Comparison of Water Relations and Osmotic Adjustment in Sorghum and Cowpea Under Field Conditions

1983 ◽  
Vol 10 (5) ◽  
pp. 423 ◽  
Author(s):  
KA Shackel ◽  
AE Hall
Keyword(s):  
Soil Water ◽  
Osmotic Adjustment ◽  
Leaf Conductance ◽  
Field Conditions ◽  
Soil Water Depletion ◽  
Pressure Potential ◽  
Water Depletion ◽  
Diurnal Patterns ◽  
Diurnal Range ◽  
Xylem Pressure Potential

Seasonal and diurnal patterns of xylem pressure potential, Ψx, and osmotic potential, Ψs, were compared using contrasting genotypes of sorghum [Sorghum bicolor (L.) Moench] and cowpea [Vigna unguiculata (L.) Walp.] under frequently imgated 'wet' and water-limited 'dry' field conditions. Generally, differences in Ψx and Ψs among genotypes within each species were small compared with differences between the two species. Sorghum exhibited a larger diurnal range and larger differences between wet and dry treatments for Ψx, Ψs, and estimates of bulk leaf turgor than did cowpea. Seasonal and drought- induced osmotic adjustment occurred in sorghum, but not in cowpea. Diurnal patterns of leaf conductance indicated that, under the dry treatment, cowpea avoided the occurrence of large plant water deficits by substantial reductions in leaf conductance, especially at midday, whereas sorghum maintained moderate values of leaf conductance throughout the day. Cowpea exhibited a larger diurnal range of leaf conductance and larger differences between wet and dry treatments than did sorghum. Differences were not observed between the species in overall soil water depletion or in root activity as estimated from profiles of soil water depletion until senescence occurred in cowpea. Sorghum genotypes that had been selected on the basis of differences in Ψs did exhibit significant differences in average values of leaf conductance and total soil water depletion, but the genotype that had the lowest Ψs (M35-1) also had the lowest leaf conductance and the least soil water depletion.

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