Book of Extended summaries ISDA

International Conference on Reimagining Rainfed Agro-ecosystems: Challenges & Opportunities
during 22-24, December 2022 at ICAR-CRIDA, Hyderabad
T4-23P-1114
Changes in Soil Fertility Status after Long Term Application of Integrated
Nutrient Management in Direct Seeded Rice-Field Pea Cropping System
T. Chandrakar 1 , A. K. Thakur 1 , A. K. Kerketta 1 , A. Pradhan 1 , G. Ravindra Chary 2 ,
K. A. Gopinath 2 and B. Narsimlu 2
1 SG College of Agriculture & Research Station, Indira Gandhi Krishi Vishwavidylaya, Jagdalpur,
Chhattisgarh-494001
2 Central Research Institute for Dryland Agriculture, Hyderabad
India ranks second in the world for rice production involving high yielding rice varieties with
intensive agriculture involving huge amount of nutrient removal. It can be seen that increase in
application of inorganic nutrient sources cause the soil to deteriorate in terms of soil fertility.
Application of organic sources of nutrients along with fertilizers has improved soil properties as
well as maintained good soil health besides improving the availability of nutrients to plants and
hence productivity also.
Methodology
A long-term field experiment has been conducted sincekharif 2014 at long term field trial of
dryland farm of Shaheed Gundadhur College of Agriculture and Research Station, Jagdalpur,
Chhattisgarh. The experiment was conducted in a random bock design with twelve treatments
(see table for treatment description) replicated four times. Soil organic carbon, available N, P and
K were determined in the laboratory by standard procedures after rabi harvest of 2021-22.
Results
After a span of seven years of continuous cropping of rice- field pea with different treatments,
significant variations in organic carbon status was observed. There was a 6-7.5 % increases in
organic matter in treatments where FYM were given @ 5 t/ha as compared to initial (within the
span of 7 years). The results were supported by findings of Zhao and Zhou (2011). Combined
application of FYM and inorganic fertilizers exhibited significant effect on the soil available
nitrogen. The highest amount (284 kg ha -1 ) of available nitrogen was estimated in 100% NPK+5
t FYM(T6) followed by 281 kg ha -1 in 50% NPK+5 t FYM+ ZnSO4@25kg ha -1 (T11). The lowest
value of (184 kg ha -1 ) available nitrogen in 100% PK (T3) was due to mining of available
nitrogen for long period. Increase in available nitrogen is mainly attributed to direct addition of
FYM. The conditions promoting mineralization of nutrients are favorable organic carbon
content, porosity, C: N ratio, water holding capacity, microbial activity etc. All these conditions
Sustainable soil management for resilient rainfed agro-ecosystem: conservation agriculture, organic farming,
INM, soil-microorganisms-plant interactions
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