Rooting depth and soil water extraction patterns of different crops in a silty loam Haplustoll

Dardanelli, J. L.; Bachmeier, O. A.; Sereno, Roberto; Gil, Ramón

doi:10.1016/s0378-4290(97)00017-8

Cited by 182 publications

(130 citation statements)

References 24 publications

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“…4a, c), which may be set by the primary root extension velocity, as for annual crops (Bland and Dugas 1989;Robertson et al 1993b). This result was consistent with other studies (Brown 2004;Dardanelli et al 1997;Meyers et al 1996) when seedling lucerne root growth is not inhibited by hostile soil conditions, such as acidic or sodic sub soils or compacted layers (Dolling et al 2005). In contrast, the EFV of the established lucerne root systems increased two-fold to 33 mm day −1 (Fig.…”

Section: Lucerne Transpiration Demandsupporting

confidence: 92%

“…4), when grown on a stony silt loam. This rapid descent of the extraction front has not been reported previously for lucerne and is comparable to that of annual crops, where EFV ranges from 23 to 49 mm day −1 (Dardanelli et al 1997;Meinke et al 1993;Robertson et al 1993a;Singh et al 1998). …”

Section: Lucerne Transpiration Demandsupporting

confidence: 77%

“…Monteith (1986) developed an approach to quantify crop water supply as an exponential function of plant available water in different soil layers (Passioura 1983). The Monteith model has been used widely to describe water extraction of annual crops grown on deep silt loam soils that have high plant available water capacity (PAWC) (Dardanelli et al 1997;Meinke et al 1993;Robertson et al 1993a;Singh et al 1998). Also, for conditions of deep soils, with high PAWC, Monteith's model has been used to estimate water supply for lucerne crops (Brown 2004;Dardanelli et al 1997).…”

Section: Introductionmentioning

confidence: 99%

“…The Monteith model has been used widely to describe water extraction of annual crops grown on deep silt loam soils that have high plant available water capacity (PAWC) (Dardanelli et al 1997;Meinke et al 1993;Robertson et al 1993a;Singh et al 1998). Also, for conditions of deep soils, with high PAWC, Monteith's model has been used to estimate water supply for lucerne crops (Brown 2004;Dardanelli et al 1997). However, often lucerne is grown on shallow, stony soils with low PAWC Sim et al 2015).…”

Section: Introductionmentioning

confidence: 99%

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Soil water extraction patterns of lucerne grown on stony soils

et al. 2016

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Background and aims Lucerne (Medicago sativa L.) is often grown under water-limited production conditions due to its capacity to extract water from deep soil layers through an extensive taproot system. These soils often contain stones which cause the roots to become unevenly distributed due to displacement by rock fragments. To improve the estimation of water use by lucerne grown in stony soils, we investigated the temporal pattern of water supply and demand, and how this influences crop growth. Methods Naturally occurring stones in the silt loam soil profile were used to reduce the plant available water capacity for three lucerne crops. The Monteith model was fitted against observed soil water to obtain estimates of the extraction rate constant (kl, day −1 ) and extraction front velocity (EFV, mm day −1 ) of lucerne roots. Crop water demand was represented by transpiration losses driven by intercepted solar radiation based on the Bcanopy conductance^approach. Results The Monteith model described the pattern of water extraction for lucerne grown on stony soils. However, a single, constant kl and EFV were inappropriate for characterising water extraction. The main physiological responses to water stress were (i) a reduction in canopy conductance, (ii) a reduction in canopy expansion and (iii) the rearrangement of leaves into a more vertical position. Conclusion This study validated frameworks to quantify lucerne water extraction and transpiration demand which can be used to improve the estimation of water use by lucerne crops.

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Section: Lucerne Transpiration Demandsupporting

confidence: 92%

Section: Lucerne Transpiration Demandsupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Soil water extraction patterns of lucerne grown on stony soils

et al. 2016

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“…The value of RD max , RD 0 , b r , and c r were determined based on data from Mayaki et al (1976). Dardanelli et al (1997) calculated root depths for soybean maturity groups III, V, and VII of 1.3, 1.9, and 2.3 m, respectively. Thus, the use of 1.6 m for RD max in this simulation is reasonable.…”

Section: Model Developmentmentioning

confidence: 99%