2.1. Location and growth conditions
The field experiment was conducted at the Main Research Station, National Research Center located at Nubaria region west of Nile Delta of Egypt during the late summer (September–December) of 2010. The research field is situated in an arid climate region at an altitude of 164 m above mean sea level and is intersected by latitude of 30°30′N and longitude of 30°20′E. The soil of the experimental site is sandy in texture (Entisol-Typic Torripsamments), composing 86.5% sand, 9.2% silt and 4.3% clay, with an alkaline pH 8.2, EC of 0.85 dS/m, CaCO3 of 1.5% and 0.27% organic matter in the upper 0–40 cm soil layer. The available N, P and K were 16, 4 and 35 mg kg−1 soil, respectively before the initiation of the experiment. The average soil water content at field capacity from surface soil layer down to 80 cm depth at 20 cm intervals was 9.8% and the permanent wilting point for the corresponding depths was 4.6% respectively. Climate of the experimental site is usually dry with ineffective rainfall amount of 16.5 mm, occurring throughout the season. The climatic parameters were taken from Nubaria meteorological station according to the official data from the Egyptian Ministry of Agriculture. The detailed climatic parameters recorded in 2010, from September to December during the growth season are summarized in
2.1. Location and growth conditions
The field experiment was conducted at the Main Research Station, National Research Center located at Nubaria region west of Nile Delta of Egypt during the late summer (September–December) of 2010. The research field is situated in an arid climate region at an altitude of 164 m above mean sea level and is intersected by latitude of 30°30′N and longitude of 30°20′E. The soil of the experimental site is sandy in texture (Entisol-Typic Torripsamments), composing 86.5% sand, 9.2% silt and 4.3% clay, with an alkaline pH 8.2, EC of 0.85 dS/m, CaCO3 of 1.5% and 0.27% organic matter in the upper 0–40 cm soil layer. The available N, P and K were 16, 4 and 35 mg kg−1 soil, respectively before the initiation of the experiment. The average soil water content at field capacity from surface soil layer down to 80 cm depth at 20 cm intervals was 9.8% and the permanent wilting point for the corresponding depths was 4.6% respectively. Climate of the experimental site is usually dry with ineffective rainfall amount of 16.5 mm, occurring throughout the season. The climatic parameters were taken from Nubaria meteorological station according to the official data from the Egyptian Ministry of Agriculture. The detailed climatic parameters recorded in 2010, from September to December during the growth season are summarized in
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