Water balance, surface conductance and water use efficiency of two young hybrid-poplar plantations in Canada’s aspen parkland

2017 ◽  
Vol 246 ◽  
pp. 256-271 ◽  
Author(s):  
Hughie Jones ◽  
T. Andrew Black ◽  
Rachhpal S. Jassal ◽  
Zoran Nesic ◽  
Nick Grant ◽  
...  
2018 ◽  
Vol 10 (11) ◽  
pp. 1682 ◽  
Author(s):  
Kelly Thorp ◽  
Alison Thompson ◽  
Sara Harders ◽  
Andrew French ◽  
Richard Ward

Improvement of crop water use efficiency (CWUE), defined as crop yield per volume of water used, is an important goal for both crop management and breeding. While many technologies have been developed for measuring crop water use in crop management studies, rarely have these techniques been applied at the scale of breeding plots. The objective was to develop a high-throughput methodology for quantifying water use in a cotton breeding trial at Maricopa, AZ, USA in 2016 and 2017, using evapotranspiration (ET) measurements from a co-located irrigation management trial to evaluate the approach. Approximately weekly overflights with an unmanned aerial system provided multispectral imagery from which plot-level fractional vegetation cover ( f c ) was computed. The f c data were used to drive a daily ET-based soil water balance model for seasonal crop water use quantification. A mixed model statistical analysis demonstrated that differences in ET and CWUE could be discriminated among eight cotton varieties ( p < 0 . 05 ), which were sown at two planting dates and managed with four irrigation levels. The results permitted breeders to identify cotton varieties with more favorable water use characteristics and higher CWUE, indicating that the methodology could become a useful tool for breeding selection.


2011 ◽  
Vol 350 (1-2) ◽  
pp. 221-235 ◽  
Author(s):  
Paul L. Drake ◽  
Daniel S. Mendham ◽  
Don A. White ◽  
Gary N. Ogden ◽  
Bernard Dell

2020 ◽  
Vol 13 (6) ◽  
pp. 2744
Author(s):  
Elaine Cristina Batista da Silva ◽  
José Romualdo De Sousa Lima ◽  
Antônio Celso Dantas Antonino ◽  
Airon Aparecido Silva de Melo ◽  
Eduardo Soares de Souza ◽  
...  

A irrigação suplementar pode ser uma técnica promissora para o aumento da produção da palma forrageira, contudo, depende da evapotranspiração (ET). A irrigação e a ET estão estritamente relacionados com a produtividade das culturas (P), de modo que a relação entre P e ET resulta na eficiência no uso de água (EUA). Assim, objetivou-se avaliar P, ET e EUA em palma, sob irrigação suplementar. O experimento foi conduzido em campo, com palma submetida a irrigação por gotejamento com intervalos de reposição de água no solo de 7 (T7), 14 (T14) e 21 (T21) dias, mais o tratamento de sequeiro (T0), em blocos ao acaso, com 4 repetições. O crescimento da palma foi monitorado por meio da medição da largura (LC), do comprimento (CC), da área (AC), do índice de área (IAC) e da espessura dos cladódios (EC). Ao longo do ciclo da cultura também foram monitoradas as condições meteorológicas. A ET foi obtida como termo residual da equação do balanço hídrico. Os tratamentos não tiveram efeitos significativos nas variáveis biométricas e na produtividade da palma forrageira. A menor ET foi obtida no T0 (406,1 mm total e 1,7 mm d‑1), sendo que o T7 apresentou a maior ET (664,4 mm total e 2,8 mm d-1). A maior EUA (392,8 kg MF ha-1 mm-1) foi obtida no tratamento sob sequeiro (T0). Com base na produtividade e na EUA da palma forrageira, recomenda-se, para as condições do município de Garanhuns, que o cultivo da mesma seja realizado sob condições de sequeiro.Effect of the Supplemental Irrigation on Yield and Water Use Efficiency of Cactus Pear A B S T R A C TThe supplementary irrigation may be a promising technique to increase forage cactus yield, however, it depends of evapotranspiration (ET). Irrigation and ET are closely related to crop yields (P), so the relationships between P and ET result in water use efficiency (WUE). Thus, the objective was to evaluate P, ET and WUE in cactus pear, under supplementary irrigation. The experiment was conducted under field conditions with cactus pear submitted to drip irrigation with soil water replacement intervals of 7 (T7), 14 (T14) and 21 (T21) days, plus the rainfed treatment (T0), in blocks with 4 replicates. Cactus pear growth, by the measurements of width (WC), length (LC), area (CA), area index (CAI) and thickness of cladodes (CD), was monitored. Meteorological conditions along the cactus pear cycle were monitored. The ET was quantified by the soil water balance method. The treatments had no effects on the biometric variables and yield of cactus pear. ET was lower in T0 (406.1 mm total and 1.7 mm day-1), with T7 showing the highest values of ET (664.4 mm total and 2.8 mm day-1). It was observed that the largest WUE (392.8 kg MF ha-1 mm-1) was in the rainfed treatment (T0). On the basis of the yield and WUE of the cactus pear, it is recommended, for the conditions of the municipality of Garanhuns that the cultivation of the same be carried out under conditions of rainfed.Key words: Soil moisture; evapotranspiration; water balance.


HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1161d-1161
Author(s):  
C. M. Geraldson

During the 1970s a mulched gradient concept was adapted by the Florida vegetable industry and the average yield of tomatoes was doubled. Currently, because of potential water restrictions and society's increasing concerns about environmental pollution, a containerized gradient concept is being evaluated. Containers, media and nutrient/water balance are major components being evaluated to maximize water use efficiency and minimize pollution and, at the same time, maintain or increase the existing competitive excellence. Three seasons of results indicate tomato yields equivalent to those produced commercially; water use has averaged 4 liters/plant/day (about 1/5 to 1/10 that used commercially; and leaching, fumigation and plastic mulches have been eliminated. The concept as a sustainable production system is considered commercially feasible.


2018 ◽  
Vol 42 (3) ◽  
pp. 271-280 ◽  
Author(s):  
Fernando França da Cunha ◽  
Ivan Pereira de Souza ◽  
Washington de Oliveira Campos ◽  
Valter Carvalho de Andrade Júnior ◽  
Thiago Alves Magalhães ◽  
...  

ABSTRACT Due to the water balance in the Brazilian Cerrado, it is not necessary to cultivate arugula in a rainfed system. Together with the lack of research on with this crop, it is necessary to study the response of genotypes to irrigation in this biome. Thus, the objective of this study was to determine the optimal irrigation depth and to identify the best arugula genotypes. Three arugula genotypes were field-tested during two cycles under the effect of four irrigation depths based on crop evapotranspiration. The parameters evaluated were root depth, SPAD index, number of plants and leaves per plant, plant diameter, fresh shoot mass and water use efficiency. The arugula presented the same demand for irrigation in the two cycles, and the genotypes and/or irrigation depths affected the evaluated parameters. The results support that the Folha Larga variety should be preferred by Brazilian Cerrado producers and irrigated with 90% replacement of crop evapotranspiration.


2001 ◽  
Vol 149 (2) ◽  
pp. 233-246 ◽  
Author(s):  
Rolf T. W. Siegwolf ◽  
Rainer Matyssek ◽  
Matthias Saurer ◽  
Stephan Maurer ◽  
Madeleine S. Günthardt-Goerg ◽  
...  

2012 ◽  
Vol 32 (1) ◽  
pp. 80-90 ◽  
Author(s):  
Danilton L. Flumignan ◽  
Rogério T. de Faria ◽  
Bruno P. Lena

Quantifying soil evaporation is required on studies of soil water balance and applications aiming to improve water use efficiency by crops. The performance of a microlysimeter (ML) to measure soil evaporation under irrigation and non-irrigation was evaluated. The MLs were constructed using PVC tubes, with dimensions of 100 mm inner diameter, 150 mm depth and 2.5 mm wall thickness. Four MLs were uniformly distributed on the soil surface of two weighing lysimeters conducted under bare soil, previously installed at Iapar, in Londrina, PR, Brazil. The lysimeters had 1.4 m width, 1.9 m length and 1.3 m depth and were conducted with and without irrigation. Evaporation measurements by MLs (E ML) were compared with measurements by lysimeters (E L) during four different periods in the year. Differences between E ML and E L were small either for low or high atmospheric demand and also for either irrigated or non-irrigated conditions, which indicates that the ML tested here is suitable for measurement of soil evaporation.


2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Wen Lin ◽  
Wenzhao Liu ◽  
Qingwu Xue

Abstract To compare the soil water balance, yield and water use efficiency (WUE) of spring maize under different mulching types in the Loess Plateau, a 7-year field experiment was conducted in the Changwu region of the Loess Plateau. Three treatments were used in this experiment: straw mulch (SM), plastic film mulch (PM) and conventional covering without mulch (CK). Results show that the soil water change of dryland spring maize was as deep as 300 cm depth and hence 300 cm is recommended as the minimum depth when measure the soil water in this region. Water use (ET) did not differ significantly among the treatments. However, grain yield was significantly higher in PM compared with CK. WUE was significantly higher in PM than in CK for most years of the experiment. Although ET tended to be higher in PM than in the other treatments (without significance), the evaporation of water in the fallow period also decreased. Thus, PM is sustainable with respect to soil water balance. The 7-year experiment and the supplemental experiment thus confirmed that straw mulching at the seedling stage may lead to yield reduction and this effect can be mitigated by delaying the straw application to three-leaf stage.


Sign in / Sign up

Export Citation Format

Share Document