Influence of depth of irrigation, land and water management practices on root attributes and soil moisture extraction pattern in sunflower (Helianthus annuus L.)

摘要

The effects of depth of irrigation, and land and water management on root attributes and soil moisture extraction by sunflower (SH-3322) were studied in Bangalore, Karnataka, India. Greater root length (33.27 cm), root volume (101.28 cc), root dry weight (63.23 g) and root density (0.63) were obtained with 3-cm-deep irrigation. Irrigation at 5 cm depth recorded greater root width (24.41 cm) and seed yield (27.86 quintal/ha) over irrigation at 3 cm depth (23.11 cm and 25.62 q/ha, respectively). Soil depth of 15-30 cm contributed a major share of moisture depletion (41.35%) under the 3-cm-deep irrigation. However, soil depths of 0-15 and 15-30 cm were on a par in their contribution to moisture depletion under irrigation at 5 cm depth (33.17 and 36.57%, respectively). Paired row planting with normal irrigation recorded greater root length, volume and dry weight. However, root width was greatest under paired row planting with irrigation only in paired rows. The latter treatment also depleted greater amount of moisture from a soil depth of 0-30 cm. [1.0 quintal=100 kg].