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Subject: Agricultural Meteorology × Author: Rahul × End date: 2023 × Start date: 2020 × Type: Thesis ×
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    ThesisItemOpen Access
    Microclimate modification and simulation studies on pigeonpea under semi-arid conditions
    (CCSHAU, Hisar, 2023-05) Rahul; Khichar, M.L.
    Field experiment entitled ―Microclimate modification and simulation studies on pigeonpea under semi-arid climatic conditions‖ were conducted during kharif season (2020 and 2021) at research farm, Department of Agricultural Meteorology, CCS HAU, Hisar located at 29º 10´ N latitude, 75º 46´ E longitude and 215.2 m altitude. The experiment was put in a factorial randomized block design and comprised of three plant spacing (main plot treatments) viz. S1- 30 × 10 cm, S2- 40 × 10 cm, S3- 60 × 10 cm and four sub plot treatments comprising four varieties viz. V1 (Paras), V2 (Manak), V3 (PAU 881) and V4 (Pusa 992) with three replications. Spacing 60 × 10 cm and Pusa 992 took more number of days to attain physiological maturity in both the crop seasons. Higher plant height was recorded in spacing 30 × 10 cm and Pars in both the crop seasons. Maximum dry matter was observed in 60 × 10 cm spacing and Paras in both the crop seasons. Maximum LAI and chlorophyll content was recorded in 60 × 10 cm spacing and Paras in both the crop seasons. LAI and chlorophyll content increases with the advancement of crop growth intervals and reach maximum at 130 DAS and then gradually decrease up to 150 DAS. Maximum primary and secondary branches per plant were observed in 60 × 10 cm spacing and Paras in both the crop seasons. Test weight, number of pods per plant, number of seeds per pod, seed yield, straw yield, biological yield and harvest index were observed highest in 60 × 10 cm spacing and Paras in both the crop seasons. Highest GDD, HTU and PTU were recorded in 60 × 10 cm spacing and Pusa 992 from seedling emergence to physiological maturity in both the crop seasons. The temperature profiles were inverse in morning hours and lapse in evening hours. The relative humidity profiles were lapse inside the crop canopy throughout the day but profiles were near iso-humic at 0900 in the morning during various growth stages during both crop seasons. Simulation performance of model showed an underestimation with days to anthesis, days to physiological maturity, LAI and biological yield, while, Harvest index and seed yield was overestimated by the model.