Vol. 10, Issue 12 (2021)

Author(s):
T Raghavendra, YS Satish Kumar, PV Ramamuni Reddy, D Venkatesh Babu, K Mohan Vishnuvardhan, B Ravi Prakash Reddy, ESV Narayana Rao and K Prabhakar

Abstract:
A field experiment was conducted for three continuous kharif seasons of 2014, 2015 & 2016 at Regional Agricultural Research Station, Nandyal, Andhra Pradesh to study the water logging stress at different Stages on cotton, maize and sunflower crops of vertisols under simulated conditions. Studies were conducted under rain out shelters with simulated waterlogging conditions at different stages of three major kharif crops like cotton, maize and sunflower. Waterlogging decreased the cotton kapas yield significantly over the control. Imposition of waterlogging for two days and four days were significantly reduced the kapas or lint yield. Four days waterlogging decreased the kapas yield by 43.22 percent and two days waterlogging decreased the kapas yield by 34.81 percent over the control at vegetative and boll development stages. In maize crop, highest seed yield was observed in control treatment (5412 kg/ha) while lowest seed yield was observed in maize crop at vegetative stage waterlogged condition (2935kg/ha). In sunflower crop also almost similar results (Table 3) were reported as in case of cotton and maize crops through out the three years of study. Highest LAI (2.32) at 60 DAS, SLA (145.8(cm²/g), Plant height (140 cm) at 80 DAS, SCMR (53 at 60DAS), NAR (0.917 g/m2/day), RGR (0.0226 g/m²/day), CGR (11.113 g/m²/day) at 80 DAS were recorded in control treatment when compared to other treatments. Highest seed yield was observed in control treatment (540 kg/ha) while lowest seed yield was observed in sunflower crop at seed filling stage (225 kg/ha).