Record Details

Soil carbon and nitrogen dynamics in a Vertisol following 50 years of notillage, crop stubble retention and nitrogen fertilization

KRISHI: Publication and Data Inventory Repository

View Archive Info
 
 
Field Value
 
Title Soil carbon and nitrogen dynamics in a Vertisol following 50 years of notillage, crop stubble retention and nitrogen fertilization
Not Available
 
Creator Not Available
 
Subject Soil organic carbon, Soil nitrogen, Tillage, Stubble management
 
Description Not Available
Conservation agriculture commonly improves soil health and results in organic C sequestration. This study
compared conventional tillage (CT) and no tillage (NT) systems, examining differences in stubble management
[stubble burning (SB) and stubble retention (SR)] and N fertilization on soil C, C fractions and N. The experiment
was established in 1968 on a Vertisol at Hermitage in Queensland, Australia. After 50 years of management; it
was found that the tillage regime, the addition of N fertilizers, and the stubble management were all important in
influencing soil C pools in 0–0.1m of soil depth. Overall, the addition of N fertilizers and the tillage regime were
the most important management factors. For example, the addition of N fertilizers at a rate of 90 kg ha−1 resulted
in an average increase in SOC of 18%, while use of NT resulted in an average increase in SOC of 5%.
Similarly, application of N fertilizers increased total soil N (TSN) concentrations by ≤25.5%, increased the
stabilized SOC fraction by ≤26.6%, and increased microbial biomass C by ≤22%. Regardless, stubble management
practices were also important, with the retention of stubble increasing TSN, increasing the stabilized C
fraction, and increasing the microbial biomass C≤30%. Finally, it was observed that the microbial metabolic
quotient was 39% higher when stubble was burned and in the absence of N fertilization, indicating microbial
stress under these treatments. The study clearly shows the importance of stubble retention and N fertilization in
conservation agriculture for improvement in soil health and maintenance of soil C levels.
Not Available
 
Date 2020-05-21T09:44:10Z
2020-05-21T09:44:10Z
2020-01-01
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/36030
 
Language English
 
Relation Not Available;
 
Publisher Not Available