Book of Extended summaries ISDA

International Conference on Reimagining Rainfed Agro-ecosystems: Challenges & Opportunities
during 22-24, December 2022 at ICAR-CRIDA, Hyderabad
T4a-57P-1367
Influence of Organic and Inorganic Nutrients on Nitrogen & Potassium
Fractions In Relation to Yield of Elephant Foot Yam - Blackgram System
K. V. Aswin 1* , K. Laxminarayana 2 and J.V.N.S. Prasad 3
*1 College of Agriculture, OUAT, Bhubaneswar, Odisha, 751003
2 Regional Centre, ICAR-Central Tuber Crops Research Institute, Bhubaneswar,
Odisha, 751 019
3
ICAR-Central Research Institute of Dryland Agriculture, Hyderabad, Telangana, 500059
*aswinkv91@gmail.com
Elephant foot yam (EFY) (Amorphophallus paeoniifolius L), crop produced for its underground
modified stem, encourage the farmers to plant because of high quality corms, minimal pest and
disease incidence, and low labour requirements. Black gram [Vigna mungo (L.)] is known as
"King of Legumes" and produced as a mixed crop, cash crop, and sequential crop in cropping
systems. Legume-based cropping systems have been shown to be generally beneficial to the soil
by preservation of organic matter, increasing soil nitrogen, improving soil physical properties
and by breaking the cycle of soil-borne diseases. Inorganic forms of major nutrients significantly
contribute to yield and quality attributes of crops. Plant roots take up nitrogen from the soil
mostly as NO3 - and to some extent as NH4 + -N. Use of chemical fertilizers in conjunction with
organic manures has been reported to influence the dynamics of inorganic K fractions. The
distribution of inorganic forms of N and K in soils is important in understanding the conditions
controlling their availability to growing crops and effective nutrient management strategies.
Methodology
Yield parameters of EFY and blackgram were recorded at harvest, the grain & haulm samples of
black gram as well as corm samples of elephant foot yam were collected, washed thoroughly,
oven dried at 60ºC and dry weights were recorded. Inorganic forms of N namely NH4-N and
NO3-N were determined by steam distillation method (Black, 1965). Inorganic K fractions were
determined by Boiling Nitric Acid Method (Wood and Deturk, (1941); Pratt, (1965)).
Relationship of different N and K fractions with available nitrogen and potassium was worked
out respectively, by computing simple correlation coefficients by employing standard procedure
as described by Gomez and Gomez (1984).
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