الفهرس 
The relationship between water management and soil properties..Only 14 pages are availabe for public view
 |  | from | 178 |  |  |
| | | from | 178 | | |
Abstract
The objective of this research is to evaluate the impact of deficit
irrigation treatments and soil organic amendments application on some
soil properties, growth, yield, yield quality, and water productivity of
sugar beet crop growing under different soil salinity. Two experimental
sites differed in soil salinity (< 4, and @10 dS/m) were selected in Demo
farm, Faculty of Agriculture, Fayoum University, Fayoum, (29 ˚ 17 ' N
latitude, 30 ˚ 54 ' E longitude).
Irrigation water applied (IWA) were three different deficit irrigation,
representing one of the following three treatments: I 1 = 100%, I 2 = 80%
and I 3 = 60% of ETc under controlled were added using gated pipe system.
Soil management practices were two organic amendments; each of them
was applied by different levels [i.e. zero, 15 t ha -1 of compost (C 1 ), 30 t ha -
1 of compost (C 2 ), 10 t ha -1 of biochar (B 1 ), and 20 t ha -1 of biochar (B 2 )].
In each site using complete randomized blocks (spilt plot) design. Sugar
beet seeds (Beta vulgaris L., Baraca variety) were planted in two
successive winter seasons along two years (2019 and 2020). Plant growth
parameters, yield, yield quality, irrigation water applied (IWA), ETo,
ETc, ETa, water use efficiency and water productivity were determined
of sugar beet.
The obtained results revealed that the applied treatments irrigation
and/or soil organic amendments applications rates significantly improved
the studied soil properties (i.e. decrease both bulk density and hydraulic
conductivity, increase in total porosity, water holding pores). The applied
treatments had an effect on studied plant-water relations, water use
efficiency (WUE), water productivity of sugar beet had been increased.
Using the three empirical equations data indicate that the ETo values
calculated by class A pan and Penman-Monteith equations were lower in
all cases than the ETo values calculated by Hargreaves equation in the
growing seasons. On the meantime closest equation to the actual
irrigation requirements (applied. IWA), in field was class A pan equation
for sugar beet in Fayoum region.
The highest sugar beet yield resulted from full irrigation treatment
(I 100 ) with the high level of organic amendments (C 2 or B 2 ). As, at limited
water resources, applied irrigation treatment (I 80 × C 2 or B 2 ), can be used
to save the applied irrigation water by 20% and little loss of sugar beet
yield (> 10%).
Keywords: biochar, compost, deficit irrigation, empirical equations, soil
salinity, sugar beet crop, water use efficiency.