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ThesisItem Open Access Optimization of irrigation frequency for onion crop under subsurface drip system(CCSHAU, 2019) Ashish Kumar; Sanjay KumarAn experiment was conducted to study the effect of lateral spacing (45 cm and 60 cm) and drip irrigation frequencies (one, two, three and four days) on onion crop (Agrifound dark red variety) during kharif season 2018 in micro plots (2 m x 2 m) constructed in lab area of Department of Soil and Water Engineering, COEA&T, CCSHAU, Hisar, Haryana, India. For 60 DAT, in daily irrigation at 45 cm lateral spacing, available moisture (9.78 cm) in the root zone (0-60 cm) at the middle of two laterals was observed higher (15.6%) than at 60 cm lateral spacing where available moisture was 8.46 cm. The highest yield in A (> 5.0 cm), B (4.0-5.0 cm) and C (3.0-4.0 cm) grade of onion was observed as 0.76, 0.54 and 0.31 kg m-2 in two days irrigation frequency with 45 cm lateral spacing. The highest marketable yield of onion (155.23 q ha-1) was observed in two days irrigation frequency with lateral spacing of 45 cm. Among the different treatments, lowest unmarketable yield was observed in two days irrigation frequency with lateral spacing of 45 cm. These parameters show that better quality of onion was obtained in this treatment. The highest yield of onion (175.67 q ha-1) was obtained in two days irrigation frequency with lateral spacing of 45 cm which was 16.8% higher than two days irrigation frequency with lateral spacing of 60 cm. Irrigation water use efficiency was found to be highest (10.23 kg m-3) in two days irrigation frequency with lateral spacing of 45 cm. On the basis of moisture distribution pattern, better quality and highest yield of onion, two days irrigation frequency with 45 cm lateral spacing is the most preferable treatment in sandy loam soils.