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Long-term impact of soil and nutrient management practices on soil quality in rainfed Alfisols at Anantapur in Andhra Pradesh

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Title Long-term impact of soil and nutrient management practices on soil quality in rainfed Alfisols at Anantapur in Andhra Pradesh
Long-term impact of soil and nutrient management practices on soil quality in rainfed Alfisols at Anantapur in Andhra Pradesh
 
Creator ICAR_CRIDA
 
Subject Soil quality, key indicators, tillage, INM, Alfisol, groundnut, castor
 
Description Not Available
Impact of long-term use of soil and nutrient management treatments was studied at All India
Coordinated Research Project for Dryland agriculture Anantapur in three on-going experiments. In experiment 1,
the long-term integrated nutrient management treatments tested under groundnut system significantly influenced
most of the soil quality parameters. The soil quality indices as influenced by different integrated nutrient
management practices varied from 1.32 to 1.96 across the management treatments. The key soil quality indicators
identified under this system along with their percent contributions were: EC (7%), OC (17%), available N (4%),
available K (16%), exchangeable Ca (16%), exchangeable Mg (16%), DTPA- Fe (6%), DTPA-Zn (2%), and
dehydrogenase activity (DHA) (16%). In experiment 2 comprising of tillage practices and nutrient management
treatments using groundnut as test crop, the soil quality indices varied from 2.01 to 2.7. The parameters which
emerged as key soil quality indicators were: pH, EC, exchangeable Ca, Mg, DTPA- Fe, available B, DHA and
labile carbon (LC). Of all the indicators, LC played a major role in influencing or aggrading the quality of the
soils followed by soil pH. Among the tillage practices, low tillage played a significant role in improving the soil
quality (SQI 2.43) and proved superior, followed by conventional tillage practice (SQI 2.37). Among the nutrient
treatments, sole 100% organic treatment (SQI 2.62) proved quite superior in improving the soil quality followed
by conjunctive nutrient application viz., 50% organic + 50% inorganic (SQI 2.35). while the sole 100% inorganic
nutrient application could maintain SQI value only up to 2.10. In experiment 3, where groundnut-castor was the
crop rotation, soil quality indices varied from 0.85 to 1.73 across the treatments. The key soil quality indicators
identified for groundnut-castor system along with their percent contributions were: EC (23%), available P (21%),
available S (22%), available B (9%), LC (21%) and MWD (4%). Application of 100% N (inorganic) maintained
significantly highest soil quality with SQI value of 1.73, followed by application of 50% N through gliricidia
loppings + 50% N through inorganic source (SQI 1.52). This observation clearly indicated the proportionally
equal and important role-played by EC, available P, available S and LC in influencing the quality of these Alfisols
under castor-groundnut rotation.
Not Available
 
Date 2020-02-25T09:06:58Z
2020-02-25T09:06:58Z
2010
 
Type Technical Report
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/32888
 
Language English
 
Relation Not Available;
 
Publisher Sharma, K. L. Srinivas Rao, Ch, Srinivas, K