<div>Background: Soil compaction adversely affects mechanical and water transmission characteristics, thus hampering crop growth and productivity. However, under coarse-textured soils, compaction to a certain extent is beneficial concerning restricting water transmission, increasing water retention and improving productivity. The present study was aimed to investigate the effect of compaction and irrigation on soil physical characteristics and productivity of summer moongbean. 
 
Methods: A field study was conducted on summer moongbean for two years in loamy sand soil at Punjab Agricultural University, Ludhiana, India. The treatments comprised three compaction levels i.e. no roller pass (C0), one roller pass (C1) and three roller pass (C3) in main plots and in subplots three irrigation regimes (I0.4, I0.6 and I0.8) with three replicates. Observations included soil bulk density and infiltration rate; seed emergence count, growth traits, yield and yield attributes. 
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Result: Soil bulk density of 5-10 cm depth increased from 1.53 at C0 to 1.62 Mg m-3 at C3. However, infiltration rate of water in soil decreased to 38% with an increase in compaction level from C0 to C3. Seed emergence count was deleteriously affected with increasing compaction level but at 15 DAS, it increased by 33 and 42% at C1 and C3 levels under I0.8 regime as compared to I0.4. Plant height was also minimal at C3 irrespective of irrigation regimes. Compaction reduced the root length density in the surface layers but it increased in the sub-surface layers. Grain and straw yield increased by 15 and 13%, respectively in C1 over C3. An increase in irrigation regimes from I0.4 to I0.8, increased the mean straw and grain yield from 5.10 to 6.10 t ha-1 and 1.13 to 1.32 t ha-1 respectively. However, the irrigation water productivity decreased with an increase in irrigation frequency. These result suggest that compaction up to one roller pass with I0.8 irrigation regime can be beneficial for enhancing grain yield of summer moongbean in loamy sand soil.&nbsp;</div>

Effect of Compaction and Irrigation Regimes on Soil Physical Characteristics, Emergence, Growth and Productivity of Summer Moongbean