Partial root zone drying exerts different physiological responses on field-grown grapevine (Vitis vinifera cv. Monastrell) in comparison to regulated deficit irrigation

2014 ◽  
Vol 41 (11) ◽  
pp. 1087 ◽  
Author(s):  
Pascual Romero ◽  
Juan Gabriel Pérez-Pérez ◽  
Francisco M. del Amor ◽  
Adrián Martinez-Cutillas ◽  
Ian C. Dodd ◽  
...  
Keyword(s):  
Root Growth ◽  
Water Use ◽  
Deficit Irrigation ◽  
Fruit Set ◽  
Storage Capacity ◽  
Fine Root ◽  
Root Zone ◽  
Biomass Accumulation ◽  
Regulated Deficit Irrigation ◽  
Fine Root Growth

Regulated deficit irrigation (RDI) and partial root zone irrigation (PRI) were compared for 4 years at two irrigation volumes (110 mm year–1 (1) and 78 mm year–1 (2)) in field-grown grafted Monastrell grapevines (Vitis vitifera L.) to distinguish the effects of deficit irrigation from specific PRI effects. PRI-1 and RDI-1 vines received ~30% of the crop evapotranspiration (ETc) from budburst to fruit set, 13–15% from fruit set to veraison and 20% from veraison to harvest. RDI-2 and PRI-2 vines received around 20% of ETc from budburst to fruit set, no irrigation from fruit set to veraison, and recovery (21–24% ETc) thereafter. Compared with RDI-1, PRI-1 increased irrigation depth and total soil water (θv) availability in the root zone, and stimulated greater fine root growth and water uptake. Increased soil volume exploration supported greater canopy water use, vegetative development, biomass accumulation and internal water storage capacity. PRI-1 vines had higher stomatal conductance, lower leaf-level water use efficiency and increased leaf xylem sap concentration ([X-ABA]leaf) following reirrigation. Compared with RDI-2, PRI-2 decreased total θv availability, fine root growth and water uptake, gas exchange, leaf water status, [X-ABA]leaf, biomass accumulation and storage capacity. Xylem ABA decreased with total θv availability in PRI-2, probably from limited sap flow when θv in drying soil was low (≈20%). For this rootstock–scion combination, high irrigation volumes applied to the wet part of the roots (θv > 30%) are critical for increasing root-to-shoot ABA signalling and growth, and improving performance under semiarid conditions.

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

Water ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 3510
Author(s):  
Chenli Zhou ◽  
Hengjia Zhang ◽  
Fuqiang Li ◽  
Zeyi Wang ◽  
Yucai Wang
Keyword(s):  
Root Growth ◽  
Water Use Efficiency ◽  
Water Deficit ◽  
Water Use ◽  
Vegetative Growth ◽  
Deficit Irrigation ◽  
Growth Stage ◽  
Growth Period ◽  
Regulated Deficit Irrigation ◽  
Use Efficiency

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.

scholarly journals IMPACT OF REGULATED DEFICIT IRRIGATION AND FOLIAR ZINC NANOPARTICLES APPLICATION ON PRODUCTIVITY OF MANGO TREES

2020 ◽  
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Deficit Irrigation ◽  
Fruit Set ◽  
Mangifera Indica ◽  
Total Yield ◽  
Regulated Deficit Irrigation ◽  
Significant Difference ◽  
Use Efficiency ◽  
Nano Zinc

what is impact of regulated deficit irrigation and foliar Zn nanoparticles application on productivity of mango trees? the answer to this question represents the main objective of this study. To verify this, an experiment was performed during the 2016/2017 on the mango trees mango (Mangifera indica L.) cvs." Nawomy" and "Sokary" which have about 16 years old in sandy soil under drip irrigation system. 100, 50, 75% of the crop evapotranspiration "ETc" were used, in parallel with three levels of concentrations of NPs-Zn micronutrient (0, 50, and 100 ppm) were applied three times; i.e., before flowering, 10 days after full bloom and after fruit set stages in both seasons. The highest yield and water-use efficiency were obtained with applying the RDI-75% of ETc treatment without significant difference that 100% of ETc treatment. The average fruit weight and size, length and width were larger for mango fruits from the 100% of ETc and 75% of ETc, with TSS%, total reducing sugars and ascorbic acid content being significantly greater than fruits of other irrigation treatments. Therefore, using the nano zinc as foliar sprays on mango trees at a concentration of 100 ppm improved fruit set percentage, total yield fruit quality (physical and chemical properties), also increased water use efficiency. It could be concluded that irrigated trees with 75% of ETc plus foliar spraying of nano zinc (NPs-ZnSO4) at 100 ppm was the most effective treatment for increasing fruit set, total yield and quality as well as water use efficiency of Nawomy and Sokary mango trees.

scholarly journals IRRIGATION DEFICIT STRATEGIES ON PHYSIOLOGICAL AND PRODUCTIVE PARAMETERS OF 'TOMMY ATKINS' MANGO

2016 ◽  
Vol 29 (1) ◽  
pp. 173-182 ◽  
Author(s):  
MARCELO ROCHA DOS SANTOS ◽  
SÉRGIO LUIZ RODRIGUES DONATO ◽  
EUGÊNIO FERREIRA COELHO ◽  
PAULO ROBERTO FERNANDES COTRIM JUNIOR ◽  
IGOR NOGUEIRA DE CASTRO
Keyword(s):  
Gas Exchange ◽  
Water Use Efficiency ◽  
Water Use ◽  
Deficit Irrigation ◽  
Root Zone ◽  
Leaf Temperature ◽  
Maturation Stage ◽  
Regulated Deficit Irrigation ◽  
Irrigation Deficit ◽  
Use Efficiency

ABSTRACT: The objective of this work was to evaluate the gas exchange, leaf temperature, yield and water use efficiency in 'Tommy Atkins' mango under irrigation deficit strategies. The experimental design was randomized block, with seven treatments with regulated deficit irrigation (RDI) under micro-spray and five treatments with partial root-zone drying (PRD) under drip irrigation. The treatments on RDI consisted of application of 100, 75 and 50% of ETc at the stages S1 (beginning of flowering to fruit set) S2 (fruit development) and S3 (fruit physiological maturation). The treatments on PRD consisted of application of 100, 80, 60 and 40% of ETc, in the same three stages, alternating the irrigation side every 15 days. The regulated deficit irrigation causes less negative interference in gas exchange than the partial root-zone drying, and the climate factors affect the gas exchange and leaf temperature of 'Tommy Atkins' mango more than the regulated deficit irrigation. The partial root-zone drying irrigation with 60 and 40% of ETc causes a decrease in the 'Tommy Atkins' mango yield. The regulated deficit irrigation up to 50% of ETc, applied at the fruit maturation stage, maintain the yield and water use efficiency.

scholarly journals Fine Root Growth in Late-season `Valencia' Sweet Orange Trees Harvested by Trunk Shaker

HortScience ◽  
2006 ◽  
Vol 41 (4) ◽  
pp. 1007E-1007
Author(s):  
Kuo-Tan Li ◽  
Jim Syvertsen ◽  
Jackie Burns
Keyword(s):  
Root Growth ◽  
Fine Roots ◽  
Fine Root ◽  
Root Zone ◽  
Sweet Orange ◽  
Young Fruit ◽  
Late Season ◽  
Custom Made ◽  
Fine Root Growth ◽  
Root Exposure

Mechanical harvesting using trunk shakers on late-season `Valencia' sweet orange [Citrus sinensis (L.) Osb.] trees can remove young fruit for the next crop and occasionally cause root exposure or severe bark scuffing on the trunk. To evaluate the effects of these physical injuries on fine root growth and lifespan, we installed minirhizotrons in the root zone of 15-year-old fruiting `Valencia' trees on Swingle citrumelo [C. paradise Macf. × Poncirus trifoliate (L.) Raf.] rootstocks. Images of roots against the minirhizotron tubes were captured biweekly with a custom-made video-DVD recorder system. Trees were harvested in early June by hand or with a linear-type trunk shaker in two consecutive years. Bark injury after trunk shaking was mimicked by removing part (42%) of the bark tissue from the main trunk with a sharp knife. Numbers of fine roots, root activity and lifespan as indexed by the color of the root, and the distribution of new fine roots after harvest were analyzed. Although root exposure was common with the normal operations during mechanical harvesting, few disturbances reached the major fine root zone. There was no clear correlation between root growth and trunk shaking with or without bark injury. The root system might benefit from less competition after the loss of young fruit from mechanical harvesting, as a greater availability of carbohydrates or other resources may compensate for any potential damage due to mechanical harvesting.

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

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.

Eucalyptus tree influence on spatial and temporal dynamics of fine-root growth in an integrated crop-livestock-forestry system in southeastern Brazil

Rhizosphere ◽  
2021 ◽  
pp. 100415
Author(s):  
Wanderlei Bieluczyk ◽  
Marisa de Cássia Piccolo ◽  
Marcos Gervasio Pereira ◽  
George Rodrigues Lambais ◽  
Moacir Tuzzin de Moraes ◽  
...  
Keyword(s):  
Root Growth ◽  
Fine Root ◽  
Temporal Dynamics ◽  
Southeastern Brazil ◽  
Spatial And Temporal Dynamics ◽  
Fine Root Growth

scholarly journals Effect of the optimized regulated deficit irrigation methodology on water use in garlic

2022 ◽  
Vol 260 ◽  
pp. 107280
Author(s):  
B.C. Léllis ◽  
A. Martínez-Romero ◽  
R.C. Schwartz ◽  
J.J. Pardo ◽  
J.M. Tarjuelo ◽  
...  
Keyword(s):  
Water Use ◽  
Deficit Irrigation ◽  
Regulated Deficit Irrigation
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