Book of Extended summaries ISDA

International Conference on Reimagining Rainfed Agro-ecosystems: Challenges & Opportunities
during 22-24, December 2022 at ICAR-CRIDA, Hyderabad
T4-36P-1351
Nutrient Management for Sustaining Productivity of Sunflower Based
Cropping Systems in Vertisols of AP
K. Prabhakar 1 , B. V. Venkata Ramanamma 1 , B. V. Prakash Reddy 1 , K. Ramesh 2 ,
Y. S. Satish Kumar 1 , R. Narasimhulu 1 and N. C. Venkateswarlu 1
1 AICRP on Sunflower, RARS, Nandyal, ANGRAU, A. P.
2
ICAR-IIOR, Rajendranagar, T.S.
* kprabhakar7714@gmail.com
Sunflower (Helianthus annuus L.) is an important oilseed crop fourth next to soybean,
groundnut, and rape seed. In India, sunflower is grown over an area of 8.30 lakh hectares with a
production and productivity of 5.44 lakh tonnes and 655 kg per hectare, respectively during the
year 2012-13. In Andhra Pradesh, it is mostly grown as a rabi crop. In combined Andhra
Pradesh, the area under this crop has come down from 4.19 lakh hectares in 2008-09 to 1.42 lakh
hectares in 2012- 13. About 80 percent of this area is under rabi. The area has further decreased
and reached 13,000 hectares in 2018-19. (Nimbrayan et al., 2020) In recent changed cropping
systems under ID conditions, new profitable crops were cultivated in the Kurnool district very
extensively like Bt cotton, Maize, and Soybean, but scientific study and recommendations were
not available to sustain the yields and net returns of popular new emerging cropping systems.
Hence this study was initiated to know the suitable fertilizer dose and sunflower cropping
systems for Kurnool district. Among various methods of fertilizer recommendation such as
general recommended dose (RDF), soil test-based recommendation, critical value approach, etc.,
the soil test crop response (STCR) approach for target yield is unique in indicating both soil testbased
fertilizer dose and the level of yield that can be achieved with good agronomic practices
(Singh et al., 2005)
Methodology
Field experiment were carried out for four consecutive Kharif and Rabi seasons of 2017-18 and
2020-21 at R.A.R.S. Farm, Nandyal, Andhra Pradesh. The treatments comprised of four
cropping systems viz., Cotton-sunflower (CS1), Maize-sunflower (CS2), Soybean-sunflower
(CS3) and Sunflower-Chickpea (CS4) as main plots and three fertilizer levels for Rabi i.e 100%
RDF (75 N 90+ P2O5+ 60 K2O kg/ha) 100% STCR and 50% STCR as sub plots. The
experimental design was split-plot and treatments were replicated thrice. Kharif crops cotton
(Jaadu Bt), Maize, (Syngenta, 46866) Soybean (JS-335) and Sunflower (NDSH-1012) were
cultivated in main plots by following recommended package of practices and recommended dose
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