Authors
1
Dept. Soil Chem. and Physics, Cent. Desert Res., Cairo, Egypt.
2
Dept. Soil and Water, Fac. Environ. Agric. Sci., Arish Univ., Egypt.
Abstract
A field experiment was conducted during two successive winter seasons in El Tina plain area, North Sinai, Egypt. It aims to study the effect of drain spacing, ploughing method and gypsum and elemental sulphur as soil amendments application on some soil physical properties. The main plots were devoted to different drain spacing, S (25, 35 and 50 m). The subplots were allocated to ploughing method, P (conventional and cross subsoiling plough). The sub-subplots were assigned for soil amendment application, A (without amendment, gypsum and elemental sulphur application).The results indicated that, for different studied soil depths, the combined treatment of 25 m drain spacing, cross subsoiling ploughing method and gypsum application resulted in the highest effect of decreasing soil bulk density relative to control treatments. Such decreases were 16.80, 16.80, 11.80, 13.50, 14.50 and 11.10 % lower than the control treatment for soil depths 0-10, 10-20, 20-30, 30-40, 40-50 and 50-60, respectively. The interaction effect of 25m drain spacing with cross subsoiling method and gypsum amendment application recorded the highest increase in total soil porosity. Such increments were 19.36, 17.07 and 10.10 % for the three upper studied soil depths, respectively over control treatment. Similar trend was found true for the three studied lower soil depths with different magnitudes. The combined treatment of 25 m drain spacing, cross subsoiling ploughing method and gypsum as soil amendment generally recorded the highest values of soil Ks increments in the studied soil depths . The two values 1.77 and 1.46 m day-1 were recorded in 0-10 and 10-20 cm soil depths. The obtained values under corresponding 20-30, 30-40 , 40-50 and 50-60 cm soil depths were 0.81, 0.74, 0.67 and 1.21 m day-1, respectively.
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