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Journal of Pharmacognosy and Phytochemistry

Journal of Pharmacognosy and Phytochemistry

Vol. 7, Issue 3 (2018)

Impact of conservation tillage on soil organic carbon storage and soil labile organic carbon fractions of different textured soils under rice- wheat cropping system: A review

Author(s):

RK Naresh, RK Gupta, KS Krishna Prasad and SS Tomar

Abstract:
Conservation management approaches focusing on minimizing soil disturbance maximizing soil cover, and stimulating biological activity can be achieved with different cropping choices and production goals in different environments all around the Indo-Gangetic Plains, India. The conservation tillage practice in wheat increased the organic carbon content and carbon stock as compared to conventional tillage in soils. The Conservation tillage increased dissolved organic carbon, microbial biomass carbon light and heavy fractions of carbon in soils at both the depths. The light and heavy fraction carbon values were observed to be lower in lighter textured soil which increased with increase in fineness of the texture. The total nitrogen was highest in clay loam under conservation tillage at 0-15 cm depth as compared to conventional tillage. As tillage intensity increased there was a redistribution of SOC in the profile, but it occurred only between ZT and PRB since under CT, SOC stock decreased even below the plow layer.
However, higher SOC content of 8.14 g kg-1 of soil was found in reduced tilled residue retained plots followed by 10.34 g kg-1 in furrow irrigated raised beds with residue retained plots. Whereas, the lowest level of SOC content of 5.49 g kg-1 of soil were found in puddled transplanted rice followed by wheat planted under conventionally tilled plots. Average SOC concentration of the control treatment was 0.54%, which increased to 0.65% in the RDF treatment and 0.82% in the RDF+FYM treatment. Compared to F1 control treatment the RDF+FYM treatment sequestered 0.33 Mg C ha-1 yr1 whereas the NPK treatment sequestered 0.16 Mg C ha-1 yr-1. Long term conservation tillage significantly increased 66.1%, 57.9%, 50.9%, 38.3%, 37.3% and 32% LFOC, SOC, PON, TN, LFON, DOC and POC, over conventional tillage (T7) treatment and WSC 39.6% in surface soil and 37.4% in subsurface soil. Under RWCS, TOC contents were similar in 50% RDN as CF+50% RDN as GM/SPM (F6) and1/3rd N as CF+1/3rd N as FYM+1/3rd N as GM/SPM (F7) and 75% RDN as CF+25% RDN as FYM (F3) plots and significantly higher than those in control (no manure and fertilizer) (F1) plots (by 50.4% 48.3%, and 43.3% respectively). Manure addition further enhanced TOC contents, which were highest following the 50% RDN as CF+50% RDN as FYM (F5) treatment (21.37 gkg−1). Therefore, conservation agriculture in rice-wheat system can help directly in building–up of soil organic carbon, labile organic carbon fractions and improve the fertility status of soil.

Pages: 2545-2562  |  1179 Views  516 Downloads


Journal of Pharmacognosy and Phytochemistry Journal of Pharmacognosy and Phytochemistry
How to cite this article:
RK Naresh, RK Gupta, KS Krishna Prasad and SS Tomar. Impact of conservation tillage on soil organic carbon storage and soil labile organic carbon fractions of different textured soils under rice- wheat cropping system: A review. J Pharmacogn Phytochem 2018;7(3):2545-2562.

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