TY - JOUR
T1 - Soil water depletion in irrigated mature pecans under contrasting soil textures for arid Southern New Mexico
AU - Deb, Sanjit K.
AU - Shukla, Manoj K.
AU - Sharma, Parmodh
AU - Mexal, John G.
N1 - Funding Information:
Acknowledgments Authors thank New Mexico State University Agricultural Experiment Station for support. The financial support from the Specialty Crop Research Initiative (SCRI), USDA– CSREES, is gratefully acknowledged. Authors appreciate the cooperation of Mr. Mid Ray Clark, the owner of the private pecan orchard (Site 1). Authors also thank Mr. Jeff Hamel, PMS Instrument Company, Albany, Oregon.
PY - 2013/1
Y1 - 2013/1
N2 - Relationship between plant water stress and soil water depletion (SWD) is not investigated thoroughly for irrigated pecans of southern New Mexico. In this study, transient soil water contents, rootzone SWD, and midday stem water potential (SWP) were monitored in mature pecan orchards in sandy loam (Site 1) and silty clay loam (Site 2) soils near Las Cruces, New Mexico. Corresponding to transient variations of soil water content at different depths, daily SWD varied with soil depth but not spatially. The SWD within the rootzone (0-80 cm) was higher in the shallow depths (0-40 cm) where root length density (RLD) was also higher than in the deeper depths (40-80 cm). The SWD at Site 1 was higher compared to Site 2 due to the higher clay content of the latter. The SWD patterns at outside the tree driplines were similar to those under-canopy locations because of similar RLD at the shallow depths. At both pecan orchards, differences in SWP at 2. 5, 4. 5, and 7. 6 m tree heights were evident particularly 10-14 days after irrigation. This was due to the stress caused by decreasing soil water contents at different depths, which were generally significantly correlated with SWP. Midday air temperature was as useful as midday atmospheric vapor pressure deficit for interpreting SWP. Combined influence of soil water content (0-40 cm) and air temperature on midday SWP was significant at both orchards, which can be used as an adjunct for the clear interpretation of SWP to help refine irrigation scheduling.
AB - Relationship between plant water stress and soil water depletion (SWD) is not investigated thoroughly for irrigated pecans of southern New Mexico. In this study, transient soil water contents, rootzone SWD, and midday stem water potential (SWP) were monitored in mature pecan orchards in sandy loam (Site 1) and silty clay loam (Site 2) soils near Las Cruces, New Mexico. Corresponding to transient variations of soil water content at different depths, daily SWD varied with soil depth but not spatially. The SWD within the rootzone (0-80 cm) was higher in the shallow depths (0-40 cm) where root length density (RLD) was also higher than in the deeper depths (40-80 cm). The SWD at Site 1 was higher compared to Site 2 due to the higher clay content of the latter. The SWD patterns at outside the tree driplines were similar to those under-canopy locations because of similar RLD at the shallow depths. At both pecan orchards, differences in SWP at 2. 5, 4. 5, and 7. 6 m tree heights were evident particularly 10-14 days after irrigation. This was due to the stress caused by decreasing soil water contents at different depths, which were generally significantly correlated with SWP. Midday air temperature was as useful as midday atmospheric vapor pressure deficit for interpreting SWP. Combined influence of soil water content (0-40 cm) and air temperature on midday SWP was significant at both orchards, which can be used as an adjunct for the clear interpretation of SWP to help refine irrigation scheduling.
UR - http://www.scopus.com/inward/record.url?scp=84871936138&partnerID=8YFLogxK
U2 - 10.1007/s00271-011-0293-1
DO - 10.1007/s00271-011-0293-1
M3 - Article
AN - SCOPUS:84871936138
VL - 31
SP - 69
EP - 85
JO - Irrigation Science
JF - Irrigation Science
SN - 0342-7188
IS - 1
ER -