Long term Rainfall Behavior in Western Agro-climatic zone of Haryana
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Date
2019
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CCSHAU
Abstract
The present research study entitled „Long term rainfall behaviour of western agro-climatic zone of Haryana‟ was undertaken to study seasonal characteristics, extreme events and trend of rainfall. It also analyzed relationship between rainfall and yield performance of major crops in Western Haryana. In Western Agroclimatic Zone, weekly mean maximum rainfall in 28th SMW was observed at Bhiwani (29.7 mm), Jhajjar (38.4 mm), Mahendragarh (34 mm), Rewari (42.4 mm), Jind (36.3 mm) and Rohtak (32.2 mm), respectively whereas in 31st SMW at Fatehabad (23.3 mm), 29th SMW at Hisar (29.0 mm) and in 27th SMW at Sirsa (25.6 mm). Monthly mean maximum rainfall in July was observed at Bhiwani (109.3 mm), Hisar (109.3 mm) and Jind (126.9 mm) while in August at Fatehabad (78 mm), Jhajjar (152.6 mm), Mahendragarh (115.7 mm), Rewari ( 146.3 mm), Rohtak (134.3 mm) and Sirsa ( 86.2 mm) respectively. In overall western agro-climatic zone, 332.9 mm, 14.2 mm, 23.1 mm and 22.3 mm rainfall was received by SW, NE ,Winter and Summer season respectively during the entire period of study. Annual mean rainfall was highest at Jhajjar (524.4 mm) and lowest in Sirsa (313.2 mm) while CV (%) value was highest at Rohtak (51.4 %) and lowest in Hisar (27.9 %) respectively. All stations of western Haryana exhibited decreasing annual rainfall trend where annual rainfall was decreasing significantly in four stations viz. Fatehabad, Jhajjar, Rohtak and Sirsa @ -3.08 mm, -7.54 mm, -12.25 mm and -4.78 mm per annum respectively. Post Monsoon rainfall exhibited significant decreasing rainfall trend @ -0.33 mm per annum in Rohtak. Monsoon season exhibited significant decreasing rainfall trend @ -3.42, -5.58, -9.12 and – 3.23 mm per annum in Hisar, Jhajjar, Rohtak and Sirsa, respectively. Winter Season exhibited significant decreasing trend @ -0.68 mm and -0.40 mm per annum at Rohtak and Sirsa. Pre monsoon season showed increased trend in most of the stations. Value of standard deviation and coefficient of variation was high on temporal and spatial scale which indicated highly variable rainfall in the western agro-climatic zone during study period. Extreme rainfall events mostly occurred during monsoon season which received highest rainfall. Crop seasonal rainfall and mustard and chickpea productivity was negatively correlated in all stations may be due to outbreaks of insects and pests in high temperature and humidity conditions caused by high rainfall. Crop seasonal rainfall and wheat productivity was positively correlated in four stations (Bhiwani, Jind, Mahendragarh and Rewari) and negatively correlated in rest of the 5 stations (Fatehabad, Hisar, Jhajjar, Sirsa and Rohtak).
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