Sunita Sheoran1, Dev Raj1*, R.S. Antil2, H.S. Sheoran1 and Deepika1
1Department of Soil Science, CCS Haryana Agricultural University Hisar, Haryana 125004 (India)
2Present address: Amity Food and Agriculture Foundation, Amity University Uttar Pradesh, Noida – 201313, UP (India).
Received-25.01.2017, Revised-10.02.2017
Abstract: Long-term manure application can alter a soil’s ability to sequester nutrients and mineralize C and N. However, knowledge about the decomposition and mineralization of C and N from long-term addition of organic materials in soils is lacking. Therefore, a laboratory incubation study was carried out to evaluate the C and N mineralization in a soil to which three organic manures (15 Mg FYM or 5 Mg poultry manure or 7.5 Mg pressmud per ha-1) and chemical fertilizers were applied alone or in combination. The results revealed that C mineralization rate was found to be increased with application of organic manures and amount of CO2 evolved was further increased when organic manures were applied in combination with chemical fertilizers. Application of FYM, poultry manure and pressmud along with recommended dose of N and half of P increased the amount of CO2 evolved by 18.1, 1.7 and 14.0 %, respectively, over application of recommended dose of N and P fertilizers. After 60 days of incubation, the highest (1868.0 mg kg-1) and lowest (1055.4 mg kg-1) amount of CO2 was evolved in treatment FYM15N150 and N75P30, respectively. Among the organic manures, amount of CO2 released followed the order: FYM>pressmud>poultry manure. Carbon mineralization increased with the progress of incubation and rate of increase was higher at initial stages and decreased gradually. Application of FYM15, poultry manure5, pressmud7.5 along with recommended dose of N and half of recommended P increased nitrogen mineralization potential by 2.08, 3.22 and 12.69 % over application of recommended dose of NP fertilizers, respectively. Among the organic manures, higher N mineralization potential was observed with application of pressmud as compared to FYM or poultry manure. Application of FYM and poultry manure alone reported lower N mineralization potential as compared to recommended dose of N and P fertilizers.
Keywords: Organic manures, Fertilizers, N mineralization, CO2 evolution
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