Castor centric two-tier intercropping under limited irrigation
CASTOR CENTRIC TWO-TIER INTERCROPPING UNDER LIMITED IRRIGATION
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Authors
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Y PAVAN KUMAR REDDY
Agricultural College, Acharya N.G. Ranga Agricultural University, Mahanandi-518 502, Andhra Pradesh
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B SAHADEVA REDDY
RARS, Acharya N.G. Ranga Agricultural University, Maruteru-534 122, Andhra Pradesh
Keywords:
Castor, Correlation analysis, Economic returns, Ginger intercropping, PCA, Water use efficiency, YTP-1Abstract
A field study evaluated the agronomic, economic and water-use efficiency traits of two castor genotypes (ICH-66 and YTP-1) intercropped with ginger under semi-arid conditions at Agricultural Research Station, Ananthapuramu. YTP-1 demonstrated superior performance, with significantly higher plant height (124.6-125.0 cm), spike length (126-131 cm), capsule number (up to 131) and seed yield (1819-2001 kg/ha) compared to ICH-66. The castor equivalent yield (CEY) for YTP-1 peaked at 3124 kg/ha, reflecting enhanced system productivity. Economic analysis revealed higher gross (`154,620-156,190/ha) and net returns (`112,620-114,190/ha) for YTP-1, with a benefit-cost ratio exceeding 3.5. Despite uniform water application (892 ha-mm), YTP-1 exhibited superior rain water use efficiency (RWUE: 3.367-3.502 kg/ha-mm), underscoring its adaptability to water-limited environments. Multivariate analysis (PCA and correlation) confirmed YTP-1's dominance in yield-related traits and economic viability. The study advocates YTP-1 as a promising genotype for castor-ginger intercropping in semi-arid regions, combining high productivity, profitability, and resource-use efficiency
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