Evaluation of long-term soil management practices using key indicators and soil quality in a semi-arid tropical alfisol.
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Title |
Evaluation of long-term soil management practices using key indicators and soil quality in a semi-arid tropical alfisol.
Evaluation of long-term soil management practices using key indicators and soil quality in a semi-arid tropical alfisol. |
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Creator |
ICAR_CRIDA
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Subject |
semi-arid tropics, soil quality indicators, sorghum-mung bean, sustainability yield index.
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Description |
Not Available
Alfisol soils of rainfed semi-arid tropics (SAT) are degrading due to several physical, chemical, and biological constraints. Appropriate soil-nutrient management practices may help to check further soil degradation. A long-term experiment comprising tillage and conjunctive nutrient use treatments under a sorghum (Sorghum bicolor (L.) Moench)–mung bean (Vigna radiata (L.) Wilkzec) system was conducted during 1998–05 on SAT Alfisols (Typic Haplustalf) at the Central Research Institute for Dryland Agriculture, Hyderabad. The study evaluated soil and nutrient management treatments for their long-term influence on soil quality using key indicators and soil quality indices (SQI). Of the 21 soil quality parameters considered for study, easily oxidisable N (KMnO4 oxidisable-N), DTPA extractable Zn and Cu, microbial biomass carbon (MBC), mean weight diameter (MWD) of soil aggregates, and hydraulic conductivity (HC) played a major role in influencing the soil quality and were designated as the key indicators of ‘soil quality’ for this system. The SQI obtained by the integration of key indicators varied from 0.66 (unamended control) to 0.83 (4Mg compostþ20 kg N as urea) under conventional tillage (CT), and from 0.66 (control) to 0.89 (4Mg compostþ2Mg gliricidia loppings) under reduced tillage (RT). Tillage did not influence the SQI, whereas the conjunctive nutrient-use treatments had a significant effect. On an average, under both CT and RT, the sole organic treatment improved the soil quality by 31.8% over the control. The conjunctive nutrient-use treatments improved soil quality by 24.2–27.2%, and the sole inorganic treatment by 18.2% over the control. Statistically, the treatments improved soil quality in the following order: 4Mg compostþ2Mg gliricidia loppings > 2Mg Gliricidia loppingsþ20 kg N as urea = 4Mg compostþ20 kg N as urea > 40 kg N as urea. The percentage contribution of the key indicators towards the SQI was: MBC (28.5%), available N (28.6%), DTPA-Zn (25.3%), DTPA-Cu (8.6%), HC (6.1%), andMWD(2.9%). The functions predicting the changes in yield and sustainability yield index with a given change in SQI were also determined. Not Available |
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Date |
2020-02-25T08:59:45Z
2020-02-25T08:59:45Z 2008-01-01 |
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Type |
Technical Report
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Identifier |
Not Available
Not Available http://krishi.icar.gov.in/jspui/handle/123456789/32866 |
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Language |
English
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Relation |
Not Available;
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Publisher |
Sharma, K.L., Srinivas, K., S. K. Yadav
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