IMPACT OF MICROIRRIGATION APPLICATION REGIMES ON MOISTURE, SALINITY AND PHOSPHORUS DISTRIBUTION IN SOIL | ||
| Journal of Soil Sciences and Agricultural Engineering | ||
| Article 18, Volume 32, Issue 8, August 2007, Pages 7023-7035 PDF (988.32 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jssae.2007.201357 | ||
| Authors | ||
| A.M. EL Naggar; H. A. Khater | ||
| Soil Sci. Dept. Fac. of Agric. Cairo Univ. Egypt | ||
| Abstract | ||
| A Field experiment was conducted in newly reclaimed desert soil to study the effect of three different application regimes of microirrigation system on the distribution of soil moisture, salinity and available–P in the soil. Irrigation water application regimes through microirrigation (drip irrigation) system were applied in three different treatments (Continuous and two different intermittent applications). An equal volume of applied water (4 l/h) was delivered to each treatment daily. Phosphorus as phosphoric acid was applied to each treatment with irrigation water at rate of 45 mg P /l. A grid system 10 x 20 cm covering three adjacent emitters for each treatment were chosen to collect the surface soil samples (0-20 cm) from the crossing points for determining soil moisture, salinity and available–P. The results revealed that soil moisture distribution within certain distance from emitter and the wetted radius under continuous application is higher than that under intermittent applications. Soil salinity decreased under continuous application rather than under the intermittent application. Available P concentrations in the soil surrounding the emitter were found to be higher in continuous application as compared with intermittent irrigation regimes. The relationships between soil moisture and soil salinity were described by power decrease equations whereas the soil moisture impact on available-P could be represented by power increase equations. | ||
| Keywords | ||
| Microirrigation; soil moisture; salinity; available-P; continuous; intermittent | ||
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