Photosynthetic Characteristics and Yield Response of Isatis indigotica to Regulated Deficit Irrigation in a Cold and Arid Environment

Water resource scarcity is an important factor restricting the sustainable development of agriculture in Northwest China. Regulated deficit irrigation can conserve water while maintaining high crop yields. A field experiment was conducted to evaluate the effect of regulated deficit irrigation on the photosynthetic characteristics, yield, and water use efficiency of woad (Isatis indigotica) under mulched drip irrigation from 2017 to 2019 in a cold and arid area of the Hexi Oasis irrigation region, China. Sufficient water was supplied during the seedling stage. The control consisted of adequate water supplied during the other growth stages, whereas mild, moderate, and severe water deficits were imposed during the vegetative growth period, and a mild and moderate water deficit was imposed during the fleshy root growth stage. A mild water deficit was imposed during the fleshy root maturity period. The results showed that the net photosynthetic rate, transpiration rate, and stomatal conductance under moderate and severe water deficit were significantly (p < 0.05) decreased compared with the control, respectively, during the vegetative growth period. The economic yield of mild water deficit during the vegetative growth and mild water deficit during the vegetative growth and fleshy root growth did not differ significantly (p > 0.05) from that of the control. Other treatments caused a 6.74–17.74% reduction in the economic yield of woad. The water use efficiency and irrigation water use efficiency were the highest in the mild water deficit during the vegetative growth period and the fleshy root growth period. Therefore, the application of a continuous mild deficit from the vegetative growth stage to the fleshy root growth stage with sufficient water supplied during other growth periods is recommended as the optimal irrigation regime for maximum yield, water use efficiency, and water-saving of woad.

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Effect of Regulated Deficit Irrigation on Yield and Water Use Efficiency of Processing Tomato (Solanum lycopersicum)

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.864-867.2009 ◽

2013 ◽

Vol 864-867 ◽

pp. 2009-2012 ◽

Cited By ~ 1

Author(s):

Ya Mei Wang ◽

Heng Jia Zhang

Keyword(s):

Water Use Efficiency ◽

Water Deficit ◽

Water Use ◽

Deficit Irrigation ◽

Full Irrigation ◽

Regulated Deficit Irrigation ◽

Low Level ◽

Processing Tomato ◽

Irrigated Crops ◽

Use Efficiency

An experiment was conducted to investigate the effect of regulated deficit irrigation (RDI) on yield and water use efficiency (WUE) of processing tomato in an arid climate. The results showed that crop yields of processing tomato were significantly (p<0.05) 11.0%~60.0% higher in the fully irrigated plots than RDI treatments except that subject to low level of RDI at seedling. When subject to RDI fruit number per plant, fruit weight, fruit longitudinal diameter and transverse diameter were the main components contributing to yield increase of processing tomato, while decayed fruit number was the key factor restraining tomato yield improvement. The WUE of processing tomato was significantly improved by 13.4% in RDI plants subject to low water deficit at seedling compared to full irrigation, but no difference (p>0.05) existed between fully irrigated crops and RDI plants subject to water deficit at seedling or late fruiting. However, in comparison with fully irrigated crops WUE was significantly reduced by 16.3%~23.3% in RDI plants subject to water deficits respectively at flowering and full fruiting as well as subject to high water deficit at late fruiting. Therefore, low level of RDI at seedling while full irrigation during flowering to late fruiting could be applied to effectively improve yield and WUE of processing tomato in arid areas.

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EFFECT OF REGULATED DEFICIT IRRIGATION ON VEGETATIVE GROWTH, FRUITING, STOMATAL CONDUCTANCE AND WATER USE EFFICIENCY IN 'NULES' CLEMENTINE UNDER ARID CONDITIONS OF THE SOUSS VALLEY OF MOROCCO

Acta Horticulturae ◽

10.17660/actahortic.2015.1065.225 ◽

2015 ◽

pp. 1757-1766 ◽

Cited By ~ 1

Author(s):

Mohamed El-Otmani ◽

Souleymane Bagayogo ◽

Abdellatif El-Fadl ◽

Moulay C. Benismail

Keyword(s):

Stomatal Conductance ◽

Water Use Efficiency ◽

Water Use ◽

Vegetative Growth ◽

Deficit Irrigation ◽

Regulated Deficit Irrigation ◽

Arid Conditions ◽

Use Efficiency

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Strategic irrigation management in Australian vineyards

OENO One ◽

10.20870/oeno-one.2001.35.3.1699 ◽

2001 ◽

Vol 35 (3) ◽

pp. 129 ◽

Cited By ~ 8

Author(s):

Peter R. Dry ◽

B. R. Loveys ◽

M. G. Mccarthy ◽

Manfred Stoll

Keyword(s):

Water Use Efficiency ◽

Water Use ◽

Fruit Quality ◽

Irrigation Water ◽

Vegetative Growth ◽

Deficit Irrigation ◽

Irrigation Management ◽

Regulated Deficit Irrigation ◽

Use Efficiency ◽

Partial Rootzone Drying

<p style="text-align: justify;">Regulated Deficit Irrigation (RDI) and Partial Rootzone Drying (PRD) are examples of strategie irrigation management. They have been successfully adopted for winegrape production in Australia with the aim of controlling vegetative growth to produce 'balanced' vines, and to improve both water-use efficiency (measured as tonnes of fruit per ML of irrigation water applied) and fruit quality for winemaking. This paper will outline some of the physiological principles that underpin these strategies and provide details of experimental and commercial experience in Australian vineyards.</p>

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Effects of Regulated Deficit Irrigation On Yield and Quality of Isatis Indigotica in a Cold and Arid Environment

10.21203/rs.3.rs-400193/v1 ◽

2021 ◽

Author(s):

Yucai Wang ◽

Hengjia Zhang ◽

Fuqiang Li ◽

Rang Xiao ◽

Haoliang Deng ◽

...

Keyword(s):

Root Growth ◽

Net Photosynthetic Rate ◽

Water Deficit ◽

Water Use ◽

Photosynthetic Rate ◽

Deficit Irrigation ◽

Growth Stage ◽

Isatis Indigotica ◽

Regulated Deficit Irrigation

Abstract Field experiments were conducted to study the effects of regulated deficit irrigation on net photosynthetic rate, yield, water use and quality of Isatis indigotica under mulched drip irrigation in Hexi oasis region, which can theoretically guide researches on efficient water saving of Isatis indigotica planting. In 2016 and 2017, the experiments of regulated deficit irrigation of Isatis indigotica were carried out at Yimin Irrigation Experimental Station, Minle County, of Gansu Province, China. Except for sufficient irrigation at seedling and maturity of fleshy roots, Isatis indigotica in vegetative stage and fleshy root growth stage were subjected to mild, moderate and severe water deficit respectively, and their photosynthetic physiological indexes, yield and water use were measured. The results showed that the moderate and severe water deficits in vegetative and fleshy root growth stage significantly decreased the net photosynthetic rate and the amounts of dry matter accumulation of Isatis indigotica leaves (P<0.05), and with the increase of water deficit degree, the decrease of the net photosynthetic rate was greater; while the difference between mild water deficit and control group was not significant (P>0.05). The yield and water use efficiency of Isatis indigotica subjected to mild water deficit in vegetative and fleshy root growth stage marked the highest, reaching 8,239.56 kg/hm2 and 8,390.80 kg/hm2, 24.11 kg/hm2 and 23.62 kg/hm2·mm, respectively; other water deficit treatments were reduced, which was significantly different from the control group (P<0.05). Mild and moderate water deficit could increase the content of effective components ((R, S) - Goitrin, indirubin and indigo), and improve the quality of Isatis indigotica, but severe water deficit was not conducive to the accumulation of effective components. Therefore, the optimal water regulation treatment of Isatis indigotica is the mild water regulation deficit in vegetative and fleshy root growth stage, which can reduce the water consumption of Isatis indigotica and effectively improve the quality and its water use efficiency without reducing its yield.

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Effects of regulated deficit irrigation on grain yield and water use efficiency of spring wheat in an arid environment

Canadian Journal of Plant Science ◽

10.4141/p04-165 ◽

2005 ◽

Vol 85 (4) ◽

pp. 829-837 ◽

Cited By ~ 8

Author(s):

Bu-Chong Zhang ◽

Feng-Min Li ◽

Gao-Bao Huang ◽

Yantai Gan ◽

Pu-Hai Liu ◽

...

Keyword(s):

Grain Yield ◽

Water Use Efficiency ◽

Water Deficit ◽

Water Use ◽

Spring Wheat ◽

Deficit Irrigation ◽

Field Experiments ◽

Arid Environments ◽

Regulated Deficit Irrigation ◽

Use Efficiency

Grain yield and water use efficiency (WUE) of spring wheat ( Triticum aestivum L.) in arid environments can be improved by applying irrigation selectively to allow soil water deficits to develop at non-critical stages of crop development. Field experiments were conducted on a loam soil in Zhangye district, northwest China in 2003 and 2004 to determine the grain yield, yield components, and water use characteristics of spring wheat in response to regulated deficit irrigation (RDI) schemes. Wheat grown under the RDI schemes produced 17% (in 2004) and 29% (in 2003) higher grain yield than wheat grown under water deficit-free control (5.6 t ha-1 in 2003 and 6.2 t ha-1 in 2004). Among six RDI schemes studied, wheat having a high water deficit at the jointing stage, but free from water def icit from booting to grain-filling produced highest grain yield in both 2003 (7.95 t ha-1) and 2004 (7.26 t ha-1). Compared with the control, wheat plants grown under the RDI schemes received 59 mm (or 15%) less water via irrigation, but they either extrac ted 41 mm more (or 74%) water from the soil profile (in 2003) or lowered (16%) evapotranspiration (ET) (in 2004). Grain yield increased as ET increased from 415 to 460 mm, and declined beyond 460 mm. The WUE values varied from 0.0116 to 0.0168 t ha-1 mm-1, and wheat grown under the RDI had 26% greater WUE compared with the control. Grain yield and WUE of spring wheat can be greatly improved by regulated deficit irrigation with reduced amounts of water. This practice is particularly valuable in arid regions where wheat production relies heavily on irrigation. Key words:

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