scholarly journals Photosynthetic nitrogen- and water-use efficiencies in C3 and C4 subtype grasses grown under two nitrogen supply levels

2021 ◽  
pp. 1-12
Author(s):  
Yuko Togawa-Urakoshi ◽  
Osamu Ueno
Keyword(s):  
Water Use ◽  
Nitrogen Supply ◽  
Water Use Efficiencies ◽  
C4 Subtype

Yield and water use efficiencies of maize and cowpea as affected by tillage and cropping systems in semi-arid Eastern Kenya

2012 ◽  
Vol 115 ◽  
pp. 148-155 ◽  
Author(s):  
J.M. Miriti ◽  
G. Kironchi ◽  
A.O. Esilaba ◽  
L.K. Heng ◽  
C.K.K. Gachene ◽  
...  
Keyword(s):  
Water Use ◽  
Cropping Systems ◽  
Water Use Efficiencies ◽  
Semi Arid

scholarly journals Water Use Efficiencies of Different Maturity Group Soybean Cultivars in the Humid Mississippi Delta

Water ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1496
Author(s):  
Srinivasa R. Pinnamaneni ◽  
Saseendran S. Anapalli ◽  
Daniel K. Fisher ◽  
Krishna N. Reddy
Keyword(s):  
Glycine Max ◽  
Water Resources ◽  
Experimental Design ◽  
Grain Yield ◽  
Water Use ◽  
Production System ◽  
Mississippi Delta ◽  
Maturity Group ◽  
Glycine Max L ◽  
Water Use Efficiencies

Introducing alternative cultivars with enhanced water use efficiencies can help alleviate pressure on groundwater for crop irrigations in Mississippi (MS) Delta. A two-year field study was conducted in 2019–2020 to compare the water use efficiencies (WUE) of recently released and pre-released soybean {Glycine max (L.) Merr.} cultivars in maturity group (MG) III (‘P37A78’, ‘LG03-4561-14’), IV (‘Dyna-gro 4516x’, ‘DS25-1, DT97-4290’), and V (‘S12-1362’, ‘S14-16306’) in the MS Delta. The experimental design was a split-plot with cultivar as the first factor and the second factor was water variant irrigation (IR) and no irrigation (RF, rainfed), replicated three times. The MG IV cultivar Dyna-gro 4516x recorded the highest grain yield and WUE: grain yields were 4.58 Mg ha−1 and 3.89 Mg ha−1 under IR and RF, respectively in 2019, and 4.74 Mg ha−1 and 4.35 Mg ha−1 in 2020. The WUE were 7.2 and 6.9 kg ha−1 mm−1, respectively, in 2019 under IR and RF, and 13.4 and 16.9 kg ha−1 mm−1 in 2020. The data reveals that ‘Dyna-gro 4516x’ (MG IV), ‘LG03-4561-14’ (MG III), and ‘P37A78’ (MG III) are best adapted to the early soybean production system (ESPS) in MS Delta region for sustainable production for conserving water resources.

scholarly journals Gobi agriculture: an innovative farming system that increases energy and water use efficiencies. A review

2018 ◽  
Vol 38 (6) ◽  
Author(s):  
Jianming Xie ◽  
Jihua Yu ◽  
Baihong Chen ◽  
Zhi Feng ◽  
Jian Lyu ◽  
...  
Keyword(s):  
Water Use ◽  
Farming System ◽  
Water Use Efficiencies

scholarly journals Improved representations of coupled soil-canopy processes in the CABLE land surface model

2016 ◽  
Author(s):  
Vanessa Haverd ◽  
Matthias Cuntz ◽  
Lars P. Nieradzik ◽  
Ian N. Harman
Keyword(s):  
Water Use ◽  
Land Surface ◽  
Land Surface Model ◽  
Heat Fluxes ◽  
Soil Conditions ◽  
Surface Model ◽  
Drought Response ◽  
Deep Soil ◽  
Stable Conditions ◽  
Water Use Efficiencies

Abstract. CABLE is a global land surface model, which has been used extensively in offline and coupled simulations. While CABLE performs well in comparison with other land surface models, results are impacted by decoupling of transpiration and photosynthesis fluxes under drying soil conditions, often leading to implausibly high water use efficiencies. Here we present a solution to this problem, ensuring that modeled transpiration is always consistent with modeled photosynthesis, while introducing a parsimonious single-parameter drought response function which is coupled to root water uptake. We further improve CABLE’s simulation of coupled soil-canopy processes by introducing an alternative hydrology model with a physically accurate representation of coupled energy and water fluxes at the soil/air interface, including a more realistic formulation of transfer under atmospherically stable conditions within the canopy and in the presence of leaf litter. The effects of these model developments are assessed using data from 18 stations from the global Eddy covariance flux network FLUXNET, selected to span a large climatic range. Marked improvements are demonstrated, with root-mean-squared errors for monthly latent heat fluxes and water use efficiencies being reduced by 40 %. Results highlight the important roles of deep soil moisture in mediating drought response and litter in dampening soil evaporation.

Canopy radiation- and water-use efficiencies as affected by elevated [CO2 ]

2001 ◽  
Vol 7 (1) ◽  
pp. 75-91 ◽  
Author(s):  
Dafeng Hui ◽  
Yiqi Luo ◽  
Weixin Cheng ◽  
J. S. Coleman ◽  
Dale W. Johnson ◽  
...  
Keyword(s):  
Elevated Co2 ◽  
Water Use ◽  
Water Use Efficiencies

Mixing trees and crops increases land and water use efficiencies in a semi-arid area

2016 ◽  
Vol 178 ◽  
pp. 281-290 ◽  
Author(s):  
Wei Bai ◽  
Zhanxiang Sun ◽  
Jiaming Zheng ◽  
Guijuan Du ◽  
Liangshan Feng ◽  
...  
Keyword(s):  
Water Use ◽  
Arid Area ◽  
Water Use Efficiencies ◽  
Semi Arid

Effect of irrigation and defoliation on the herbage production and water use efficiency of four temperate pasture species

1973 ◽  
Vol 24 (6) ◽  
pp. 797 ◽  
Author(s):  
GG Johns ◽  
A Lazenby
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Water Status ◽  
The Other ◽  
Use Efficiency ◽  
Water Use Efficiencies ◽  
Similar Quantity

Measurements were made over a 12-month period of the herbage production of both dryland and irrigated monoculture swards of four temperate pasture species under two defoliation regimes. By relating herbage production to the previously reported water use results for these swards, water use efficiencies (WUE) have been computed. Dryland clover produced 2000 kg/ha less herbage than did the dryland grasses, although it used a similar quantity of water. Consequently, the WUE of dryland clover was substantially less than that of the dryland grasses. Under dryland conditions, fescue not only produced more herbage, but also used water more efficiently than did the other species. Similar amounts of irrigation enabled the clover to yield an extra 6000 kg/ha of herbage compared with a mean grass response of 1760 kg/ha. The irrigated clover swards generally used water much more efficiently than the dryland clover swards. In contrast, the grasses generally used water with similar efficiency under both irrigated and dryland conditions. Under both irrigated and dryland conditions the frequently defoliated swards usually outyielded those cut infrequently as well as making more efficient use of water. The response of pastures to irrigation is discussed in terms of the effects of irrigation on the water status of the plants and the availability of nutrients in the rhizosphere.

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