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Drip irrigation of waxy corn ( Zea mays L. var. ceratina Kulesh) for production in highly saline conditions
Ist Teil von
Agricultural water management, 2012-02, Vol.104, p.210-220
Ort / Verlag
Elsevier B.V
Erscheinungsjahr
2012
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
► Drip irrigation can be successfully used in growing waxy corn in saline wasteland. ► A good soil moisture and low salinity zone occurred around the drip line. ► The very strongly saline soil gradually changed to a moderately saline soil.
A 4-year trial was set up to test the feasibility of growing waxy corn (
Zea mays L. var.
ceratina Kulesh) in a highly saline wasteland with drip irrigation in the Ningxia plain, northwest China. The original soil salinity expressed as electrical conductivity of the saturation paste extract (
EC
e
) averaged 28
dS/m in the 0–120
cm depth. The experiment included five soil matric potential (SMP) treatments in which the SMP at 20
cm depth below the drip emitters was controlled higher than −5, −10, −15, −20 and −25
kPa after waxy corn establishment. The results showed that drip irrigation created a favorable soil condition for waxy corn growth through forming and maintaining a high moisture and low salinity region in the root zone when the SMP was maintained higher than −25
kPa. Waxy corn growth and yield parameters increased with the increase of SMP from −25
kPa to −5
kPa, but their responses to SMP decreased with the prolonged period of cultivation. Irrigation frequency and irrigation amount decreased significantly as SMP decreased from −5
kPa to −25
kPa, and the highest irrigation water use efficiency (IWUE) was available when the SMP was around −15
kPa in 2005, and was between −20
kPa and −25
kPa in successive years. After years of cultivation and drip leaching, the highly saline soil gradually changed to a moderately saline soil. This research suggests that drip irrigation can be successfully used in growing waxy corn in dry and highly saline conditions after appropriate management strategies are adopted.