Effect of Drip Irrigation with N and K Fertigation Levels on Yield Traits and Water Use Efficiency of Bush Bean Grown During Rabi Season

摘要

A field experiment was conducted at Water Technology Centre (WTC), College of Agriculture, Rajendranagar, Hyderabad during rabi season 2009-10 to study the effect of varying drip irrigation scheduling with N and K fertigation levels on performance ofbush bean (Lablab purpurium var. typical L.). The Main plot treatments consisted of four irrigation levels viz., Surface irrigation at 1.0 IW/CPE ratio.Drip irrigation at 100% E an, Drip irrigation at 80% E_( an)and Drip irrigation at 60%> E_(pan）with three fertigation levels in sub treatments viz.,NoN and ^application, 50 kg N and 5oi:g K_2O ha~(-1) and 100 kg N and 100 kg K_2O ha~(-1). The results revealed that yield attributing characters viz., number of pods per plant and pod length were highest inall the three pickings when irrigation was scheduled at 100%, E in combination with 100 kg N and 100 kg K_2O ha~(-1) Similarly, significantly higher green pod yield (3556 kg ha~(-1)) was realizecfby scheduling irrigation at 100% E_(pm)and which was 9.5%, and 22% higher in green pod yield than the irrigation scheduled at 80%, and 60%, respectively. On the other hand, drip irrigation scheduled at 60%, E recorded significantly higher water use efficiency (7.2 kg ha-mm1) over drip irrigation scheduled at 100%,, 80%, E_(fm) and surface irrigation at 1.0 IW/CPE ratio. Irrespective of the irrigation scheduling, gradual increment in fertigation levels from no fertilizer application tolOO kg ha~(-1) N and K_2O increased water use efficiency (6.1 kg ha-mm~1) and yield. The increase in the yield was to the extent of4 and 21 %, more than application of 50 kg N+50 kg K20 ha~(-1) and no fertilizer application, respectively.