Leaf Feeding Injury to Citrus by Root Weevil Adults: Leaf Area, Photosynthesis, and Water Use Efficiency

1985 ◽  
Vol 68 (3) ◽  
pp. 386 ◽  
Author(s):  
J. P. Syvertsen ◽  
C. W. McCoy
Keyword(s):  
Water Use Efficiency ◽  
Leaf Area ◽  
Water Use ◽  
Use Efficiency

Water use efficiency of wheat in a Mediterranean-type environment. II. some limitations to efficiency

1984 ◽  
Vol 35 (6) ◽  
pp. 765 ◽  
Author(s):  
RJ French ◽  
JE Schultz
Keyword(s):  
Water Use Efficiency ◽  
Leaf Area ◽  
Water Use ◽  
Harvest Index ◽  
Field Experiments ◽  
Field Trials ◽  
Growth Yields ◽  
Potential Yield ◽  
Use Efficiency ◽  
Factorial Treatments

Evidence is presented that water use efficiency and yield of wheat are reduced by insufficient leaf area and by inadequate content of nutrients in the top growth. Yields from field trials are compared with the potential yield, and a review is made of the limitations caused by weeds, the incidence of diseases and the harvest index. The data highlight the need for field experiments to define the evaporation and transpiration components of water use in each environment. They also indicate the need for multi-factorial treatments to overcome all yield limitations and thereby attain the potential yield.

scholarly journals Morphological and Ecophysiological Indicators for Coriander Under Irrigation Depths and Nitrogen Levels

2019 ◽  
Vol 11 (3) ◽  
pp. 549
Author(s):  
Fábio Teixeira Delazari ◽  
Mariane Gonçalves Ferreira Copati ◽  
Gustavo Henrique da Silva ◽  
Ronaldo Silva Gomes ◽  
Derly José Henriques da Silva ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Leaf Area Index ◽  
Leaf Area ◽  
Water Use ◽  
Area Index ◽  
Nitrogen Levels ◽  
High Soil Moisture ◽  
Randomized Design ◽  
Irrigation Depth ◽  
Use Efficiency

Nitrogen fertilization and supplying of water are crucial factors for quality and quantity produces of coriander. The objective of this study was to evaluate morphological and ecophysiological characteristics for coriander under five irrigation depths and two doses of nitrogen (N). Experimental layout was completely randomized design in a split plot scheme with five replications. The irrigation depths (plot) was 25, 50, 75, 100 and 125% of crop evapotranspiration (ETc). The doses of N (subplot) corresponded to 35 and 70 kg ha-1. The cultivation of coriander (“Vedete”) was in a protected environment. The ratio between the aerial part and roots linearly increased with the increment of the irrigation depths and was highest under 70 kg ha-1 of nitrogen. The leaf area index linearly increased with the increment of the irrigation depths at both doses of N. The leaf index of chlorophyll “a” was highest under irrigation depths of 87 and 75% of ETc for 35 and 70 kg ha-1 of N, respectively. The leaf index of chlorophyll “b” decrease linearly with the increase of irrigation depths in both doses of N. The nitrogen use efficiency was maximized with high soil moisture conditions. The water use efficiency decreases linearly with increasing of irrigation depth. The best irrigation depth and nitrogen dose obtained in this study was 125% of ETc and 70 kg/ha. The leaf index of chlorophyll “a” and “b” are important indicators of hydric stress. The leaf index of chlorophyll “b” are negatively correlated with leaf area index. N supply increase the water use efficiency.

scholarly journals Supplementary irrigation in Sudan grass: Leaf area index, dry matter production and water use efficiency

Científica ◽  
2020 ◽  
Vol 48 (2) ◽  
pp. 85
Author(s):  
Wellington Mezzomo ◽  
Marcia Xavier Peiter ◽  
Adroaldo Dias Robaina ◽  
Jardel Henrique Kirchner ◽  
Rogério Ricalde Torres ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Leaf Area Index ◽  
Leaf Area ◽  
Water Use ◽  
Dry Matter ◽  
Area Index ◽  
Sudan Grass ◽  
Matter Production ◽  
Supplementary Irrigation ◽  
Use Efficiency

scholarly journals Water use of cowpea under deficit irrigation and cultivation systems in semi-arid region

2019 ◽  
Vol 23 (4) ◽  
pp. 271-276
Author(s):  
Rômulo M. O. de Freitas ◽  
Jeferson L. D. Dombroski ◽  
Francisco C. L. de Freitas ◽  
Narjara W. Nogueira ◽  
Tiago S. Leite ◽  
...  
Keyword(s):  
Grain Yield ◽  
Water Use Efficiency ◽  
Leaf Area ◽  
Water Use ◽  
Water Consumption ◽  
Arid Region ◽  
No Tillage ◽  
Use Efficiency ◽  
Semi Arid Region ◽  
Semi Arid

ABSTRACT The resilience of crops to drought depends heavily on the cultural practices adopted, which can have a direct effect on water use efficiency. The aim of this study was to assess the influence of irrigation intervals on the growth, water consumption and water use efficiency of cowpea crops (cv. BRS Guariba) under conventional and no-tillage systems. The experiment was carried out in the semi-arid region of Rio Grande do Norte, Brazil, using a split-plot in a randomised complete block design, with four replications. Treatments consisted of two cultivation systems in the whole plots (conventional and no-tillage) and six irrigation intervals in the subplots (2, 6, 10, 14, 18 and 22 days) which were applied at full bloom. The biomass of the different parts of the plant, leaf area and leaf area index were assessed at 64 days after sowing (DAS) and grain yield, water consumption and water use efficiency at 70 DAS. No-tillage is a promising cultivation technique for cowpea crops, promoting higher grain yield and water use efficiency under semi-arid conditions. This system allows cowpea cultivation with irrigation intervals of 10 or 14 days, with no or small reduction in yield, respectively.

Sexual dimorphism in reproductive allocation and water use efficiency in Maireana pyramidata (Chenopodiaceae), a dioecious, semi-arid shrub

2003 ◽  
Vol 51 (5) ◽  
pp. 509 ◽  
Author(s):  
Andrea Leigh ◽  
Adrienne B. Nicotra
Keyword(s):  
Sexual Dimorphism ◽  
Water Use Efficiency ◽  
Leaf Area ◽  
Water Use ◽  
Leaf Tissue ◽  
Reproductive Allocation ◽  
Area Index ◽  
Significant Difference ◽  
Use Efficiency ◽  
Semi Arid

Sexual dimorphism in dioecious plant species is widely attributed to the differential impacts of reproduction on male v. female plants. We investigated sexual dimorphism in reproductive, morphological and physiological traits of Maireana pyramidata (Benth.) Paul G.Wilson (Chenopodiaceae), a dioecious, semi-arid shrub endemic to Australia. We estimated reproductive allocation for each sex by calculating the relative biomass allocated to flowers and fruits per gram of leaf tissue, based on one branch per sample plant. Morphological measurements included leaf mass, stem mass, specific leaf area, plant height and plant leaf area index. We also measured leaf nitrogen and chlorophyll, gas exchange and Δ13C. Reproductive allocation was nine times greater in females than in males. No significant difference between the sexes in photosynthetic rate or transpiration could be detected but instantaneous water use efficiency (photosynthesis/transpiration) was significantly lower in females than in males during the fruiting period. Δ13C did not differ between the sexes. The results indicate that greater reproductive allocation in females has an immediate impact on their capacity for conservative water use but does not lead to long-term differences in water use efficiency.

scholarly journals Maize Canopy Photosynthetic Efficiency, Plant Growth, and Yield Responses to Tillage Depth

Agronomy ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 3 ◽  
Author(s):  
Jiying Sun ◽  
Julin Gao ◽  
Zhigang Wang ◽  
Shuping Hu ◽  
Fengjie Zhang ◽  
...  
Keyword(s):  
Plant Growth ◽  
Water Use Efficiency ◽  
Leaf Area ◽  
Water Use ◽  
Inner Mongolia ◽  
High Yield ◽  
Dry Matter Accumulation ◽  
Net Income ◽  
Use Efficiency ◽  
Tillage Depth

Subsoil tillage loosens compacted soil for better plant growth, but promotes water loss, which is a concern in areas that are commonly irrigated. Therefore, our objective was to determine the physiological responses of high yield spring maize (Zea mays L.) to subsoil tillage depth when grown in the Western plain irrigation area of Inner Mongolia, China. Our experiment during 2014 and 2015 used Zhengdan958 (Hybrid of Zheng58 × Chang7-2, produced by Henan academy of agricultural sciences of China, with the characteristics of tight plant type and high yield) and Xianyu335 (Hybrid of PH6WC × PH4CV, produced by Pioneer Corp of USA, with the characteristic of high yield and suitable of machine-harvesting) with three differing subsoil tillage depths (30, 40, or 50 cm) as the trial factor and shallow rotary tillage as a control. The results indicated that subsoil tillage increased shoot dry matter accumulation, leading to a greater shoot/root ratio. Subsoil tillage helped retain a greater leaf area index in each growth stage, increased the leaf area duration, net assimilation rate, and relative growth rate, and effectively delayed the aging of the blade. On average, compared with shallow rotary, the grain yields and water use efficiency increased by 0.7–8.9% and 1.93–18.49% in subsoil tillage treatment, respectively, resulting in the net income being increased by 2.24% to 6.97%. Additionally, the grain yield, water use efficiency, and net income were the highest under the treatment of a subsoil tillage depth of 50 cm. The results provided a theoretical basis for determining the suitable chiseling depth for high-yielding spring corn in the Western irrigation plains of Inner Mongolia.

scholarly journals Water use efficiency, biomass production, nitrogen and potassium uptake and yield of tomato (Lycopersicon esculentum cv. Ratan) Planta grown under surface drip and flood irrigation

2013 ◽  
Vol 38 (2) ◽  
pp. 207-215
Author(s):  
AHMZ Ali ◽  
MK Rahman
Keyword(s):  
Lycopersicon Esculentum ◽  
Water Use Efficiency ◽  
Leaf Area ◽  
Water Use ◽  
Biomass Production ◽  
Drip Irrigation ◽  
Flood Irrigation ◽  
Tomato Plants ◽  
Use Efficiency ◽  
Surface Drip Irrigation

An experiment was conducted in wooden boxes to evaluate water use efficiency, biomass production, nitrogen and potassium uptake and yield of tomato plants (Lycopersicon esculentum) grown under flood irrigation (FI) and surface drip irrigation (SDI). Leaf area, leaf area index, biomass production and yield of tomato plants were significantly (P<0.05) higher in SDI than FI treatment. Biomass production (g/plant) was 53.3 and 42.2 and yield of tomato (kg/plant) was 1.27 and 0.99 in SDI and FI treatments, respectively. Surface drip irrigation increased water use efficiency (Kgm-3) of tomato plants by two fold (37.88) compared to flood irrigation ( 19.88). Significantly (P<0.05) higher concentrations of nitrogen in leaf (3.22%) and stem (2.62 %) were measured for tomato plants grown under SDI than FI (2.63 and 2.19 %). Potassium concentrations on the other hand, showed no significant differences. DOI: http://dx.doi.org/10.3329/jasbs.v38i2.15611 J. Asiat. Soc. Bangladesh, Sci. 38(2): 207-215, December 2012

scholarly journals Growth, biomass, leaf area and water-use efficiency of juvenile Pinus radiata in response to water deficits

2015 ◽  
Vol 45 (1) ◽  
Author(s):  
Matthew J Waghorn ◽  
David Whitehead ◽  
Michael S Watt ◽  
Euan G Mason ◽  
Jonathan J Harrington
Keyword(s):  
Water Use Efficiency ◽  
Leaf Area ◽  
Water Use ◽  
Pinus Radiata ◽  
Water Deficits ◽  
Use Efficiency ◽  
Response To Water
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