POTASSIUM DYNAMICS IN SOILS UNDER CUSTARD APPLE BASED AGRI–HORTIULTURE SYSTEM
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Date
2019-08-01
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BANGALORE
Abstract
Field experiment on “Potassium dynamics in soils under custard apple based agri–
hortiulture system” was conducted in 9 years old established custard apple plantation at
AICRPDA, GKVK, UAS, Bengaluru during kharif 2018. Soils of experimental site was
sandy clay loam texture, slightly acidic in nature with medium fertility. Experiment
consists of 15 treatments and replicated thrice under randomized complete block design.
The potassium fracions of soils were higher in intercropping over sole cropping system.
Before sowing and at harvest, higher water soluble K (6.66 and 6.14 mg kg–1),
exchangeable K (72.77 and 65.55 mg kg–1) was recorded in custard apple + cowpea
whereas, higher non–exchangeable K (309.60 and 300.54 mg kg–1) was recorded in
custard apple + finger millet, respectively at surface soils. Lower water soluble K (3.12
and 2.98 mg kg–1), exchangeable K (47.27 and 41.13 mg kg–1) and non–echangeable K
(209.20 and 200.54 mg kg–1) were recorded in foxtail millet, fodder maize and custard
apple alone during before sowing and at harvest respectively. Water soluble,
exchanageble and non–exchangeable K were decreased with increase in depth whereas,
lattice and total K increases. The results Quantity/Intensity relationship of K showed that
ARe
K values ranged from 16 to 32×10–3 (mol litre−1)1/2 whereas, PBCK ranged from 10.4
to 14.1 (cmol kg–1)/(mol L–1)1/2. These values falling under low range (<20) of PBCK, it
indicated that soils need judicious and frequent fertilization of K fertilizer for better crop
production.
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