Efficacy of Salicylic Acid as a Cofactor for Ameliorating Effects of Water Stress and Enhancing Wheat Yield and Water Use Efficiency in Saline Soil

ABSTRACT Understanding the critical period of weed competition is indispensable in the development of an effective weed management program in field crops. Current experiment was planned to evaluate the critical growth period ofSetaria and level of yield losses associated with delay in weeding in rain-fed drip irrigated wheat production system of Saudi Arabia. Field experiment was conducted to evaluate the effect of weeding interval (07-21, 14-28, 21-35, 28-42 and 35-49 days after sowing) and drought stress (75% and 50% of field capacity) on Setaria growth, wheat yield and water use efficiency. Season long weedy check and wellwatered (100% FC) plots were also maintained for comparison. Weeding interval and drought stress significantly (p ≤ 0.05) affected the growth and yield of Setaria and wheat. Drought stress from 75% to 50% FC resulted in reductions of 29-40% in Setaria height, 14-27% in Setaria density and 11-26% in Setaria dry biomass. All weeding intervals except 35-49 DAS significantly suppressedSetaria growth as compared with control. Delay in weeding increased weed-crop competition interval and reduced wheat yield and yield contributors. Therefore, the lowest yield of 1836 kg ha-1 was attained for weeding interval of 35-49 DAS at 50% FC. Water use efficiency and harvest index increased with decreasing FC levels but reduced with delay in weeding. Correlation analysis predicted negative association ofSetariadensity with wheat yield and yield contributors and the highest negative association was for harvest index (-0.913) and water use efficiency (-0.614). Early management of Setaria is imperative for successful wheat production otherwise yield losses are beyond economical limits.

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Water Stress Effects on Growth, Yield and Water Use Efficiency of Hemarthria Compressa

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.212-213.578 ◽

2012 ◽

Vol 212-213 ◽

pp. 578-585

Author(s):

Zhong Wen Yang ◽

Jun Ying Jin ◽

Xin Yi Xu

Keyword(s):

Water Stress ◽

Water Use Efficiency ◽

Water Use ◽

Control Period ◽

Growth Yield ◽

Control Treatment ◽

Sensitive Period ◽

Total Biomass ◽

Use Efficiency ◽

Hemarthria Compressa

Water stress is an important approach to use water resources efficiently and remit the agricultural water shortage. Hemarthria compressa is one of perennial grasses, a pasture of high quality, which has abundant species resources in China. To explore the response of the growth, yield and water use efficiency(WUE) of Hemarthria compressa under water stress, this study, adapting pot experiment, imposed three water stress degree (LD, MD and SD) treatments and a control treatment on Hemarthria compressa. The data of growth indicators during control period, yield and total water consumption were obtained. The results show a noticeable inhibitory action of water stress on the growth of Hemarthria compressa. Along with the intensifying of water stress, plant height increment, leaf area, total biomass, dry matter of each organ and yield decreased, and the root-shoot ratio increased firstly and inclined to slump finally. Plants under the middle water stress treatment achieved the greatest WUE of 38.25 kg/m3. The first 10d in the water control period was the most sensitive period of the pasture responding to water stress.

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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 ◽

10.21273/hortsci13129-18 ◽

2018 ◽

Vol 53 (12) ◽

pp. 1784-1790 ◽

Cited By ~ 4

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.

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WHEAT YIELD AND WATER USE EFFICIENCY UNDER CONTRASTING RESIDUE AND TILLAGE MANAGEMENT SYSTEMS IN A SEMIARID AREA OF MOROCCO

Experimental Agriculture ◽

10.1017/s0014479702000285 ◽

2002 ◽

Vol 38 (2) ◽

pp. 237-248 ◽

Cited By ~ 30

Author(s):

R. Mrabet

Keyword(s):

Water Use Efficiency ◽

Water Use ◽

Wheat Yield ◽

Conventional Tillage ◽

Wheat Crop ◽

No Tillage ◽

Partial Removal ◽

No Till ◽

Management Technology ◽

Use Efficiency

Wheat (Triticum aestivum) production using no-tillage is becoming an increasingly accepted management technology. Major obstacles to its adoption in Morocco, however, are exportation of wheat straw from the field and stubble grazing. Among pertinent solutions is the control of these practices. A four-year field study was conducted to determine the effect of residue level under no-tillage on wheat grain and total dry-matter yields, water use and water-use efficiency, and to compare this with conventional tillage systems. The aim was to evaluate whether all the straw produced is needed for no-till cropping or whether partial removal of straw from the field is possible without any adverse effect on production. No-tillage and deep tillage with disk plough performed equally well and subsurface tillage with an off-set disk produced the lowest yields. Both bare and full no-tillage covers depressed wheat production. Uo to 30% of straw produced under no-tillage can be removed without jeopardizing wheat crop performance.

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