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2019 - 201912020 - 20231
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Subject: Agricultural Meteorology × Author: Rahul × 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.
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    ThesisItemOpen Access
    Study on drought frequency and its effects on kharif crop production in Haryana
    (CCSHAU, 2019) Rahul; Dagar, C.S.
    The present study entitled ―Study on drought frequency and its effects on kharif crop production in Haryana‘‘, was conducted in 21 districts of Haryana. The primary objective of the study was to calculate the occurrence of drought frequency and its effects on crop production in Haryana during 1987 to 2016. For identification of drought year‘s two drought indices i.e. SPI and rainfall deviation from normal as given by IMD were used and the extent of deficit of annual rainfall, the annual rainfall departure analysis has been carried out. Rainfall variability analysis during kharif season showed a decreasing trend of rainfall in eastern and western zones of Haryanaexcept Faridabad in eastern zone and Hisar in western zone which showed slightly increasing trend.On the basis of SPI values the Ambala and Mewat in eastern zone and Fatehabad and Rewari in western zone are more prone to moderate drought, whereas Sonipat and Hisar has more chances to experience severe drought based on their past experience. Kurukshetra and Kaithal seems to be safer in terms of their proneness to sever drought as they never experienced SPI based severe drought condition during the study period. Another criteria i.e. IMD‘s rainfall deviation criteria of drought frequency reflected that the districts of Sonipat, Bhiwani and Rewari have more tendency of getting moderate drought as compared to other districts and Kurukshetra and Kaithal in case of severe drought. In eastern zone of Haryana majority of area was under no drought conditions on the basis of both indices.As drought category is concerned the IMD criterion for drought is more sensitive to ‗Moderate‘ and ‗Severe‘ droughts and the SPI found more sensitive to ‗No drought‘ conditions.It was concluded that more number of drought years was observed in western zone as compare to eastern zone of Haryana. The effect of drought on kharifcrops was analyzed by using correlation and scatter plot. Rice, Bajra, maize and cotton showed negative relationship with rainfall and SPI, whereas moong crop showed positive relationship with rainfall and SPI where these crops were grown. The adverse effects of drought on crop productivity were nullified by the assured irrigation facilities. The increased rainfall decreased the productivity by favouring the high incidence of pest and diseases except moong crop which were grown in summer season and relish the rainfall.