Responses of grain sorghum to varying irrigation frequency in the Ord irrigation area. II. Evapotranspiration, water use efficiency and root distribution of different cultivars

1984 ◽  
Vol 35 (1) ◽  
pp. 31 ◽  
Author(s):  
RJK Myers ◽  
MA Foale ◽  
AA Done
Keyword(s):  
Soil Water ◽  
Water Use ◽  
Root Distribution ◽  
Soil Depth ◽  
Unit Length ◽  
Grain Sorghum ◽  
Root Penetration ◽  
Area Index ◽  
Irrigation Area ◽  
Irrigation Interval

Four grain sorghum cultivars (Quicksilver, Texas 610SR, E57 and Q7844), representing early-to-late maturity types, were grown under different irrigation frequencies (7-day, 14-day, 28-day or 42-day intervals or once-only-at-sowing) in the dry season in the Ord Irrigation Area. Soil water distribution, root distribution and evapotranspiration were determined periodically. Frequent irrigation resulted in shallow root development and most water use was from the surface 40 cm of soil. Depth of water extraction increased with plant age and with less frequent irrigation. The depth of root penetration determined by direct measurement was similar to that inferred from soil water profiles. Water uptake per unit length of root was related to soil water content only in the 0-40 cm soil layers. Ea/Ep (actual evapotranspiration/pan evaporation) was classified into three stages according to the degree of soil drying after irrigation. During the first stage, immediately after irrigation, Ea/Ep was generally close to 0.75 irrespective of cultivar, leaf area index (LAI) or irrigation interval. During the second stage, linear functions adequately described Ea/Ep as a function of LA1 for LA1 less than 5. During the third stage, which commenced when total soil water to 1.8 m declined to 545 mm, poor relationships between Ea/Ep. Following an analysis of the soil water use data, it is believed that maximum yields of sorghum may be attainable with irrigation at sowing followed by three carefully timed irrigations.

scholarly journals Adapting Root Distribution and Improving Water Use Efficiency via Drip Irrigation in a Jujube (Zizyphus jujube Mill.) Orchard after Long-Term Flood Irrigation

Agriculture ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1184
Author(s):  
Zhaoyang Li ◽  
Rui Zong ◽  
Tianyu Wang ◽  
Zhenhua Wang ◽  
Jinzhu Zhang
Keyword(s):  
Water Use Efficiency ◽  
Soil Water ◽  
Water Use ◽  
Drip Irrigation ◽  
Root Distribution ◽  
Soil Depth ◽  
Flood Irrigation ◽  
Use Efficiency ◽  
Irrigation Levels

Jujube tree yields in dryland saline soils are restricted by water shortages and soil salinity. Converting traditional flood irrigation to drip irrigation would solve water deficit and salt stress. The root distribution reacts primarily to the availability of water and nutrients. However, there is little information about the response of jujube roots to the change from flood irrigation to drip irrigation. In this context, a two–year experiment was carried out to reveal the effects of the change from long–term flood irrigation to drip irrigation on soil water, root distribution, fruit yield, and water use efficiency (WUE) of jujube trees. In this study, drip irrigation amounts were designed with three levels, i.e., 880 mm (W1), 660 mm (W2), 440 mm (W3), and the flood irrigation of 1100 mm was designed as the control (CK). The results showed that replacing flood irrigation with drip irrigation significantly altered soil water distribution and increased soil moisture in the topsoil (0–40 cm). In the drip irrigation treatments with high levels, soil water storage in the 0–60 cm soil layer at the flowering and fruit setting, and fruit swelling stages of jujube trees increased significantly compared with the flood irrigation. After two consecutive years of drip irrigation, the treatments with higher irrigation levels increased root length density (RLD) in 0–60 cm soil depth but decreased that in the 60–100 cm depth. In the horizontal direction, higher irrigation levels increased RLD in the distance of 0–50 cm, while reducing RLD in the distance of 50–100 cm. However, the opposite conclusion was obtained in W3 treatment. Additionally, in the second year of drip irrigation, W2 treatment (660 mm) significantly improved yield and WUE, with an increasing of 7.6% for yield and 60.3% for WUE compared to the flood irrigation. In summary, converting flood irrigation to drip irrigation is useful in regulating root distribution and improving WUE, which would be a promising method in jujube cultivation in arid regions.

scholarly journals Genotypic variation in soil water use and root distribution and their implications for drought tolerance in chickpea

2017 ◽  
Vol 44 (2) ◽  
pp. 235 ◽  
Author(s):  
Ramamoorthy Purushothaman ◽  
Lakshmanan Krishnamurthy ◽  
Hari D. Upadhyaya ◽  
Vincent Vadez ◽  
Rajeev K. Varshney
Keyword(s):  
Soil Water ◽  
Water Use ◽  
Water Uptake ◽  
Root Distribution ◽  
Root Length Density ◽  
Soil Depth ◽  
Genotypic Variation ◽  
Yield Losses ◽  
Total Water ◽  
Deep Soil

Chickpeas are often grown under receding soil moisture and suffer ~50% yield losses due to drought stress. The timing of soil water use is considered critical for the efficient use of water under drought and to reduce yield losses. Therefore the root growth and the soil water uptake of 12 chickpea genotypes known for contrasts in drought and rooting response were monitored throughout the growth period both under drought and optimal irrigation. Root distribution reduced in the surface and increased in the deep soil layers below 30 cm in response to drought. Soil water uptake was the maximum at 45–60 cm soil depth under drought whereas it was the maximum at shallower (15–30 and 30–45 cm) soil depths when irrigated. The total water uptake under drought was 1-fold less than optimal irrigation. The amount of water left unused remained the same across watering regimes. All the drought sensitive chickpea genotypes were inferior in root distribution and soil water uptake but the timing of water uptake varied among drought tolerant genotypes. Superiority in water uptake in most stages and the total water use determined the best adaptation. The water use at 15–30 cm soil depth ensured greater uptake from lower depths and the soil water use from 90–120 cm soil was critical for best drought adaptation. Root length density and the soil water uptake across soil depths were closely associated except at the surface or the ultimate soil depths of root presence.

Crop production and water-use. II. The development and validation of a water-use model for sugarbeet

1994 ◽  
Vol 123 (1) ◽  
pp. 15-24 ◽  
Author(s):  
P. J. C. Hamer ◽  
M. K. V. Carr ◽  
E. Wright
Keyword(s):  
Soil Water ◽  
Water Use ◽  
Crop Production ◽  
Data Set ◽  
Area Index ◽  
Canopy Development ◽  
Three Phase ◽  
Different Depths ◽  
Soil Water Extraction ◽  
Development And Validation

SummaryAs a prerequisite for developing crop-yield/water-use functions for sugarbeet using the results of historical irrigation experiments, it was necessary to develop a water-use model which could operate with a limited data set. The general form of this model has been reported by Wright et al. (1994). In this paper the development and validation of the model for the sugarbeet crop is described.The canopy was modelled in terms of the leaf area index and the relative interception of incoming solar radiation using functions based on thermal time and time. Four phases of growth were identified: emergence, slow-growth, fast-growth and full-canopy. An empirical drought factor was included to allow for the effects of water stress on canopy development during the slow- and fastgrowth expansion phases. Root development was described using a three phase model: initial (temperature dependent), linear and maximum depth (both time dependent).Independent data previously reported from Broom's Barn Experimental Station were then used to validate the model in terms of its capacity to predict crop canopy development, with and without drought stress, soil water extraction at different depths and soil water deficits during the season. The study confirmed the validity of the model for predicting the water-use of sugarbeet.

Effect of drought on growth and water use of sugar beet

1987 ◽  
Vol 109 (3) ◽  
pp. 421-435 ◽  
Author(s):  
Kay F. Brown ◽  
A. B. Messem ◽  
R. J. Dunham ◽  
P. V. Biscoe
Keyword(s):  
Sugar Beet ◽  
Root System ◽  
Soil Water ◽  
Water Use ◽  
Dry Matter ◽  
Unit Length ◽  
Fibrous Root ◽  
Deep Soil ◽  
Uptake Rates ◽  
Fibrous Roots

SummaryThe growth and water use of sugar beet affected by early (ED) and late (LD) drought was compared with that of irrigated (I) and unirrigated (NI) controls. Mobile shelters were used to exclude rain from ED plots during June and July, and LD plots during August and September, respectively, whereas outside these periods the ED and LD plots were irrigated as necessary.The ED treatment affected the fibrous roots severely. Many of the roots in the top 60 cm of soil died and development of the root system below this depth was slow. Expansion of the leaf canopy slowed, radiation interception was reduced and the rate of water use fell from about 1·2 times to 0·6 times Penman potential transpiration rate. The LD treatment, which was imposed when the fibrous root system was already extensive, had little effect on the fibrous roots except in the top soil. The accessible soil water was quickly depleted and the resulting stress was accompanied by earlier senescence of leaves. The rate of converting intercepted light to crop dry matter was reduced in both treatments. However, the ED treatment was the most detrimental because the amount of light intercepted in the months of highest radiation was greatly reduced owing to the restricted leaf cover. The relative effects on growth are reflected in the final sugar yields which were 8·7, 10·5, 9·9 and 12·0 (±0·30) t/ha in the ED, LD, NI and I treatments respectively.More of the deep soil water was used in the drought-affected plots (particularly LD) than in the irrigated controls. Maximum depths of water extraction were 140–150 cm in ED and I plots and > 170 cm in LD plots. The highest uptake rates per unit length of root (20–40 μl/cm per day) were measured in the deepest part of the root system. At all depths, uptake rates declined as the soil dried. After correcting for overestimated water use where necessary, the ratios of final dry matter and sugar yields respectively to season-long water use (June–October) were close to 1·4 and 0·8 t/ha per 25 mm for all four treatments.

THE WATER RELATIONS AND IRRIGATION REQUIREMENTS OF OIL PALM (ELAEIS GUINEENSIS): A REVIEW

2011 ◽  
Vol 47 (4) ◽  
pp. 629-652 ◽  
Author(s):  
M. K. V. CARR
Keyword(s):  
West Africa ◽  
Soil Water ◽  
Water Use ◽  
Water Relations ◽  
Oil Palm ◽  
Water Productivity ◽  
Background Information ◽  
Flower Initiation ◽  
Irrigation Interval ◽  
Best Estimates

SUMMARYThe results of research on the water relations and irrigation need of oil palm are collated and summarized in an attempt to link fundamental studies on crop physiology to drought mitigation and irrigation practices. Background information is given on the centres of origin (West Africa) and of production of oil palm (Malaysia and Indonesia), but the crop is now moving into drier regions. The effects of water stress on the development processes of the crop are summarized followed by reviews of its water relations, water use and water productivity. The majority of the recent research published in the international literature has been conducted in Malaysia and in Francophone West Africa. The unique vegetative structure of the palm (stem and leaves) together with the long interval between flower initiation and the harvesting of the mature fruit (ca. three years) means that causal links between environmental factors (especially water) and yield are difficult to establish. The majority of roots are found in the 0–0.6 m soil horizons, but roots can reach depths greater than 5 m and spread laterally up to 25 m from the trunk. The stomata are a sensitive indicator of plant water status and play an important role in controlling water loss. Stomatal conductance and photosynthesis are negatively correlated with the saturation deficit of the air. It is not easy to measure the actual water use of oil palm, the best estimates for mature palms suggesting crop evapotranspiration (ETc) rates of 4–5 mm d−1 in the monsoon months (equivalent to 280–350 l palm−1 d−1). For well-watered mature palms, crop coefficient (Kc) values are in the range 0.8–1.0. Although the susceptibility of oil palm to drought is well recognized, there is a limited amount of reliable data on actual yield responses to irrigation. The best estimates are 20–25 kg fresh fruit bunches ha−1 mm−1 (or a yield loss of about 10% for every 100 mm increase in the soil water deficit). These increases are only realized in the third and subsequent years after the introduction of irrigation and follow an increase in the number of fruit bunches as a result of an improvement in the sex ratio (female/total inflorescence production) and a reduction in the abortion of immature inflorescences. There is no agreement on the allowable depletion of the available soil water, or on the associated optimum irrigation interval. Drip irrigation has been used successfully on oil palm.

scholarly journals Efeito da Irrigação Suplementar na Produtividade e Eficiência no Uso de Água da Palma Forrageira

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 ◽  
...  
Keyword(s):  
Water Balance ◽  
Water Use Efficiency ◽  
Soil Water ◽  
Water Use ◽  
Crop Yields ◽  
Promising Technique ◽  
Cactus Pear ◽  
Area Index ◽  
Supplementary Irrigation ◽  
Use Efficiency

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.

Effect of Limited Irrigation on Water Consumption and Grain Yield of Spring Maize (Zea Mays)

2013 ◽  
Vol 404 ◽  
pp. 415-419
Author(s):  
Heng Jia Zhang ◽  
Jun Hui Li
Keyword(s):  
Grain Yield ◽  
Soil Water ◽  
Leaf Area ◽  
Water Use ◽  
Water Consumption ◽  
Irrigation Management ◽  
Grain Filling ◽  
Total Water ◽  
Area Index ◽  
Spring Maize

The soil water contents in spring maize field were monitored continuously using soil neutron probe combined with drying-weighing method. Meanwhile, the effect of limited irrigation on crop periodic water consumption and its percentage in total water use, leaf area index, and grain yield of spring maize were explored. The results indicated that both the periodic water consumption and its percentage in total water use varied from low to high then to low within maize growing season, with the maximum valued both at silking to middle grain filling. In addition, leaf area indexes were greatly improved by full irrigation before maize filling, and grain yield was not reduced by efficient limited irrigation management, contrarily, yield increase and 31.1% of significant irrigation water saving were achieved, which was beneficial to the optimization of soil water ecological processing and limited irrigation management.

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