|Author:||Kang, YaoHu ; Wang, FengXin ; Liu, HaiJun ; Yuan, BaoZhong|
|Book Group Author:||NA|
A field experiment comparing different irrigation frequencies and soil matric potential thresholds on potato evapotranspiration (ET), yield (Y) and water-use efficiency (WUE) was carried out in a loam soil. The experiment included five treatments for soil matric potential: F1 (-15 kPa), F2 (-25 kPa), F3 (-35 kPa), F4 (-45 kPa) and F5 (-55 kPa) and six treatments for irrigation frequency: N1 (once every day), N2 (once every 2 days), N3 (once every 3 days), N4 (once every 4 days), N6 (once every 6 days) and N8 (once every 8 days). Results indicate that both soil matric potential and drip irrigation frequency influenced potato ET, Y and WUE. Potato ET increased as irrigation frequency and soil matric potential increased. Comparing soil water potential, the highest ET was 63.4 mm (32.1%) more than the lowest value. Based on irrigation frequency treatments, the highest ET was 36.7 mm (19.2%) more than the lowest value. Potato Y and WUE were also found to increase as irrigation frequency increased. Potato Y increased with an increase in soil water potential then started to decrease. The highest Y and WUE values were achieved with a soil matric potential threshold of -25 kPa and an irrigation frequency of once a day.
|Pages:||133 - 143|
crop yield, evapotranspiration, loam soils, matricpotential, plant water relations, potatoes, soil types, trickleirrigation, water use efficiency, China, Hebei, Solanum tuberosum, EastAsia, Asia, Developing Countries, Northern China, China, Solanum,Solanaceae, Solanales, dicotyledons, angiosperms, Spermatophyta, plants,Field Crops (FF005) (New March 2000), Plant Water Relations (FF062),Plant Production (FF100), Soil Physics (JJ300), Soil Water Management(Irrigation and Drainage) (JJ800) (Revised June 2002) [formerly SoilWater Management]