Book of Extended summaries ISDA

International Conference on Reimagining Rainfed Agro-ecosystems: Challenges & Opportunities
during 22-24, December 2022 at ICAR-CRIDA, Hyderabad
harvested within Nov. The last crop Rajmah (HUR 301), was sown in the month of mid-Dec and
harvested at the end of March in all the years. Surface soils (0-15 cm) were analyzed for soil
Physico-chemical properties after the 4 th year sequence was conducted following stranded
procedures (Jackson,1967; Dane and Top,2002). Soil microbial biomass carbon (MBC) was
analyzed by chloroform fumigation extraction method (Vance et al., 1987).
Results
Four years of pooled data reveal that the highest system yield was recorded in T3(140.31q ha - 1 ),
followed by T6 (127.94 q ha -1 ) and T4 (122.15 q ha -1 ), and the lowest in control T1 (70.33 q ha -1 )
with corresponding B: C ratios 3.14,2.79, 2.88 and 1.81, respectively. Similarly, pooled system
RWUE (kg ha -1 cm -1 ) was also found to be highest in T3 (7.34), followed by T6 (6.68) and T4
(6.42), and the lowest was in control (3.69). The data was heterogeneous at a 5% significance
level, and therefore transformations were made before performing pooled analysis. In
transformed data also, highest system yield was found in T3 (25.971 q ha -1 ), followed by T6
(23.602 q ha -1 ) which is at par with T4 (22.673 q ha -1 ) with CD values of 2.293 at a 0.05 level of
significance. Manure addition improved soil physical, chemical, and biological properties
(discussed under the head 'soil properties), which is reflected in the system yield. Nevertheless,
the Integrated supply of nutrients gave better results than sole chemical or organic management
systems. The sustainable yield index was highest in T3 (0.92), followed by T6 (0.86), T4(0.77)
and T7 (0.75), and the lowest was in control (0.46), indicating that the system in more sustainable
when 75% RDF + 3 t vermicompost ha -1 was applied in each crop followed by 50% RDF+ 3 t
vermicompost ha -1 in each crop, followed by 75% RDF +1 t vermicompost ha -1 in each crop
followed by 50 % RDF+ 1 t ha -1 vermicompost in each crop.
Sustainable Yield index
514 | Page Sustainable soil management for resilient rainfed agro-ecosystem: conservation agriculture, organic farming, INM, soilmicroorganisms-plant
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