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Book of Extended summaries ISDA

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International Conference on Reimagining Rainfed Agro-ecosystems: Challenges &<br />

Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad<br />

World Bank. 2010. Deep Wells and Prudence: Towards Pragmatic Action for Addressing<br />

Groundwater Overexploitation in India, The International Bank for Reconstruction<br />

and Development/The World Bank, Washington, D.C, USA<br />

T6-04O-1423<br />

Agricultural Drought and its Impact on Pod Yield <strong>of</strong> Rainfed Groundnut<br />

in Scarce Rainfall Zone <strong>of</strong> Andhra Pradesh<br />

Malleswari Sadhineni 1 , G. Narayana Swamy 1 , K.C. Nataraj 1 , A.V.M Subba Rao 2 and<br />

S.K Bal 2<br />

1 Acharya N.G. Ranga Agricultural University, Andhra Pradesh<br />

2 ICAR-Central Research Institute for Dryland Agriculture, Hyderabad - 500030, Telangana<br />

The major production constraint for rainfed groundnut in scarce rainfall zone <strong>of</strong> Andhra<br />

Pradesh is the limited available soil moisture due to frequent dry spells. In rainfed lands<br />

available soil moisture plays a key role for the growth and yield <strong>of</strong> crops and hence, it is one<br />

<strong>of</strong> the indicators used to study the impact <strong>of</strong> drought on growth and yield <strong>of</strong> rainfed groundnut.<br />

Therefore, the percent available soil moisture (PASM) helps to assess the phenophase-wise<br />

impact <strong>of</strong> agricultural drought on crop yield as one <strong>of</strong> the critical indicators.<br />

Methodology<br />

Agricultural drought and its impact on crop growth and yield <strong>of</strong> groundnut in Ananthapur<br />

district <strong>of</strong> Andhra Pradesh was studied by collecting soil moisture and pod yield from the crop<br />

weather relationship in groundnut experiment conducted during Kharif, 2012 to 2017 (6 years)<br />

under AICRP on Agrometeorology at Agricultural Research Station, Ananthapur. The<br />

groundnut variety K-6 was grown in three sowing environments viz., 1 st FN <strong>of</strong> July, 2 nd FN <strong>of</strong><br />

July and 1 st FN <strong>of</strong> August under rainfed condition on red sandy loam soil. The depth <strong>of</strong> soil in<br />

the experimental site was 60 cm. The soil moisture at field capacity was 71.6 mm and<br />

Permanent wilting point was 18.9 mm. The soil moisture was measured from emergence to<br />

physiological maturity at 0-40 cm depth using Delta-T soil moisture probe at weekly interval<br />

and 24 hours after receiving rainfall.<br />

The Percent Available Soil Moisture (PASM) was derived from the measured soil moisture<br />

data using the formula PASM = ((SMw-PWP)/(FC-PWP)) *100, Where SMw is weekly soil<br />

moisture (vol/vol) for current week, FC is Field capacity <strong>of</strong> soil (Vol/Vol) and PWP is<br />

Permanent Wilting point <strong>of</strong> soil (vol/vol). The calculated PASM values were categorized<br />

phenophase wise into severe drought (25 and <br />

50 and 75) to study the influence <strong>of</strong> PASM on pod yield (kg/ha) <strong>of</strong><br />

groundnut (Anonymous, 2016).<br />

Institutional and policy innovations for accelerated and enhanced impacts<br />

806 | Page

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