Microbial decomposer assisted in situ degradation of surface retained paddy straw

International Journal of Recycling Organic Waste in Agriculture

مقاله 15، دوره 12، شماره 3، آذر 2023، صفحه 467-475   

نوع مقاله: Short communication

شناسه دیجیتال (DOI): 10.30486/ijrowa.2022.1935169.1292

نویسندگان

Priya Katyal^{* 1}؛ Rachana Bhardwaj²؛ Sandeep Sharma³؛ Jagroop Kaur Sekhon⁴؛ Neemisha Pathania³؛ Pratibha Vyas¹؛ Shammi Kapoor¹؛ Gurvinder singh Kocher¹

¹Department of Microbiology, Punjab Agricultural University, Ludhiana-141004, India

²Department of Biochemistry, Punjab Agricultural University, Ludhiana-141004, India

³Department of Soil Science, Punjab Agricultural University, Ludhiana-141004, India

⁴Department of Agronomy- Punjab Agricultural University, Ludhiana-141004, India

چکیده

Purpose Paddy (rice) straw burning is an alarming issue all over India because of its huge volume generated every year. Combine harvesting results in generation of about 5-7 ton/hectare paddy straw residue that needs to be managed with in a small period (3 weeks) before sowing of wheat crop.
Method Six microbial decomposer preparations including four commercial (C-1 to C-4) and two in house culture (Delftia, Microbial consortium) have been evaluated at four different sites of Central Plain Zone of Punjab during 2018-19 and 2019-20. The microbial formulations were sprayed on the surface retained paddy straw and straw samples were evaluated after 30 days of spray for percent decrease in lignin and C/N ratio. 
Result A location and decomposer specific decrease in lignin (%) and C/N ratio during paddy straw surface retention trials was observed, without any significant change in wheat yield. In control (without spray), percent decrease in lignin was in the range of 2.11 to 13.57. Whereas, with microbial sprays, it varies from 7.51 to 35.79. At Ludhiana, maximum decrease in C/N ratio was obtained by C-1 and C-2 (55%), While, at Kapurthala maximum decrease in C/N ratio was obtained by Delftia (71.25%) followed by C-3 (62.62%).
Conclusion The variable trend in delignification as well as C/N ratio during surface retained paddy straw trials, highlights that with microbial decomposer application the surface retained paddy straw is not appreciably decomposed in the provided window period of 3 weeks between paddy harvesting and wheat sowing.

کلیدواژه‌ها

C/N ratio؛ In situ degradation؛ Lignin؛ Decomposer microbes؛ Paddy straw

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