Agronomic interventions for enhanced light interception and radiation use efficiency of hybrid pigeon pea
DOI:
https://doi.org/10.59797/ija.v70i1.5947Abstract
Aim: To find out the best agronomic management options for realising optimum plant expression and yield of hybrid pigeon pea.
Methodology: During the kharif 2021 and 2022, a field investigation was conducted at ICRISAT located at Patancheru, in Hyderabad. The objective was to analyze the impact of various establishment methods, plant geometries, and nutrient management techniques on hybrid pigeon pea, using a split-split plot design. The study employed a line quantum sensor to measure amount of light interception, photosynthetically active radiation at the stage of maximum leaf area development, and subsequently calculated radiation use efficiency. Heat maps were then generated from the field data to facilitate a comprehensive comparison and conception of the extensive data.
Results: Heat maps showed that plants with 120 cm × 120 cm plant geometry recorded high leaf area and able to intercept the most photosynthetically active radiation. However, square transplanting at 100 cm × 100 cm combined with an integrated nutrient management approach consisting of vermicompost 5 t ha-1, 100 per cent (or 150 per cent) STB NPK, PSB, and ST with Rhizobium resulted in the highest radiation use efficiency and seed yield, which was 31.5 per cent higher than with inorganic nutrient management alone.
Interpretation: The optimal agronomic technique for increased pigeonpea yield was determined to be transplanting of pigeon pea at 100 cm × 100 cm and implementing integrated nutrient management, which includes seed treatment with Rhizobium, soil test-based NPK, vermicompost @ 5 t ha-1, and PSB.
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