01895nam a2200217 a 450000100080000000500110000800800410001910000200006024500760008026000420015630000250019850000100022352013210023365000160155465000220157065000100159265000160160265000100161865000260162865300230165415578791998-03-03       1990    bl uuuu  m   00u1 u    #d1 aSILVA, E. M. da  aAnalysis of furrow irrigation uniformity as affected by furrow spacing.  a[Tucson]: University of Arizonac1990  a449p.cPh.D. Thesis.  a2 pt.  aThis reserch examines the effects of furrow espacing on irrigation uniformity and efficiency.Laboratory and field experiments were conductend to obtain information on soil physical characteristics, furrow infiltration and water advance data in order to validate the theoretical results.A furrow infiltration model besed on Richards` equation and a finite element technique is developed and used to predict infiltrated dephs in the transverse and longitudinal directions relative to the furrow centerline and furrow inlet, respectively.The model predicted measured furrow infiltration in the field from the third irrigation but field to do so for the first and second irrigations.Simulations of furrow irrigation in a hypothetical soil with various furrow spacings showed that cumulative infiltration is not affected by furrow spacing until the lateral wetting front reaches the imaginary vertical boundary located midway btween two furrows.An analysis of uniformity effeciency from predicted water distribution profiles from field irrigated furrows are conclusive in that the use of longitudinal water water distributionprofile alone is not enough to assess the performance of furrow irrigation.The transverse distribution of infiltrated depths which is a function of furrow spacing must be included in the analysis.  aagriculture  afurrow irrigation  awater  aAgricultura  aÁgua  aIrrigação por Sulco  aIrrigation methods