|Author:||El-Shouny, M. A. ; Taha, E. M. ; Sherif, M. A. ; Ewis,M. M.|
|Book Group Author:||NA|
Two field experiments were carried out at the Sids Agricultural Research Station Farm, Beni-Suef Governorate, Egypt, during 1995/96 and 1996/97 to study the relationship between planting dates (25 September, and 10 and 25 October) and irrigation treatments (irrigation at 40, 60 and 80% depletion from available soil moisture (ASMD) added to recommended irrigation) in order to determine the best irrigation regime that can be adopted to increase sugarbeet yield. No clear difference in applied irrigation water could be attributed to planting dates. Irrigation at a depletion of 40, 60 and 80% from available soil moisture saved 27.9, 30.7 and 32.3% in the first season and 29.4, 32.9 and 34.5% in the second season, respectively, compared to normal farm irrigation treatment (control). No clear difference in evapotranspiration (ET) was observed between the three planting dates. The average values of ET were 73.38, 71.48 and 71.52 cm in the first season and 76.77, 75.70 and 75.65 cm in the second one. Irrigation as recommended in the region recorded the highest ET in both seasons. Arranging these results in descending order, on average, was: ET of control > depletion at 40, 60 and 80% from available soil moisture in both seasons. The rate of soil moisture extraction from the soil layers of the root zone was very high in the surface layers (0-15 cm) and became less with increasing depth of soil in all treatments. Data indicated that sharing of each layer depends on the sowing dates and irrigation treatments. The second planting date caused the highest soil moisture extraction in the first layer (0-15 cm) and second layer (15-30 cm), while the first planting and third planting date gave the highest figures of soil moisture extraction from the third and fourth layer. Also, soil moisture extraction increased from the fourth layer (45-60 cm) at irrigation after 80% depletion of available water, while irrigation after 40% depletion of available water gave a low rate of soil moisture extraction from the fourth layer. Early planting date (September 25) was accompanied by the highest average of water use efficiency (WUE) of 9.39 and 9.55 kg roots/m3 and 1.47 and 1.49 kg sugar/m3 in the two seasons, respectively, while the late planting date resulted in the lowest values. According to WUE values, irrigation treatments could be arranged in the following descending order: 60% > 40% > 80% (ASMD) > control for root and sugar yield in both seasons.
|Pages:||329 - 345|
|Journal:||Egyptian Journal of Soil Science|
available water capacity, crop yield, evapotranspiration,irrigation, irrigation water, plant water relations, planting date,planting season, soil water content, sowing date, sugarbeet, waterrequirements, water use, water use efficiency, Egypt, Beta vulgaris var.saccharifera, Beta vulgaris, Beta, Chenopodiaceae, Caryophyllales,dicotyledons, angiosperms, Spermatophyta, plants, eukaryotes, NorthAfrica, Africa, Mediterranean Region, Middle East, Developing Countries,watering, Field Crops (FF005) (New March 2000), Plant Water Relations(FF062), Plant Production (FF100), Soil Physics (JJ300), Soil WaterManagement (Irrigation and Drainage) (JJ800) (Revised June 2002)[formerly Soil Water Management]