The Effect of the Use of Subsurface Water Retention Technology (SWRT) in the available content of nutrients in the soil under the subsurface drip irrigation system and for different Management Treatments

Abstract

Field experiments were carried out during the 2016 spring season to evaluate the effect of using subsurface water retention technology (SWRT) on the available nutrients content of the soil under the subsurface drip irrigation system and for different Management treatments at the Palm Textile Research Station of the Ministry of Agriculture in Najaf Governorate (Al-Najaf desert island). The field soil was classified as a Sandy loam texture Classified under Group Sandy loam; Strong fine , Typic, Torrifluvents. he results showed the superiority of SWRT technology in increasing the soil content of available nitrogen, phosphorous and potassium in the middle and end of the season compared with other treatments than it was at the beginning of the season. The content of available nitrogen at the end of the season reached 30.20, 30.21 and 31.67 mg N kg-1 for depths 15, 30 and 45 cm, respectively. While the content of available phosphorous at the end of the season was 13.64, 14.92 and 13.84 mg P kg-1 for depths of 15, 30 and 45 cm, respectively, while the values of available potassium content at the end of the season were 138.22, 138.57 and 138.44 mg K kg-1 for depths 15, 30 and 45 cm, respectively. With a significant increase of 7.90, 29.31 and 16.44% for the depth of 15 cm and with a percentage increase of 7.22, 29.43 and 15.84% for the depth of 30 cm and an insignificant increase of 7.63% and with a significant increase of 27.77 and 17.02% for depth 45 cm compared with the O.M, T and N treatments .T and straight. Also, O.M treatment gave an increase in the soil content of nitrogen, phosphorous and available potassium compared with T. and N.T treatments, respectively.