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Relative impacts of long-term nutrient management practices on nitrogen dynamics in rice (Oryza sativa)-based organic cropping systems of Indo-Gangatic Plains

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Title Relative impacts of long-term nutrient management practices on nitrogen dynamics in rice (Oryza sativa)-based organic cropping systems of Indo-Gangatic Plains
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Creator A L MEENA, R N PANDEY, DINESH KUMAR, V K SHARMA, S P DATTA and GEETA SINGH
 
Subject Ammonical N, Available N, Crop residues, Farmyard manure, Mineral N, Potential mineralizable N, Total N, Urease enzyme, Vermicompost
 
Description Not Available
Limited information is available on the impacts of long-term organic nutrient management practices on different
nitrogen pools and urease enzyme activity. Hence, the major objective of this study was to evaluate long-term (12 years) organic nutrient management practices’ impact on different nitrogen pools and urease activity. Treatments were two cropping systems, viz. rice (Oryza sativa L.) –wheat (Triticum aestivum L.)-mungbean [Vigna radiata (L.) Wilczek] (RWMCS) and rice-wheat (RWCS) in strips and seven nutrient combinations, i.e. FYM equivalent to 60 kg N/ha, VC equivalent to 60 kg N/ha, FYM + crop residue (CR) of preceding crop @ 3 t/ha for each rice, wheat and mungbean, VC+CR, FYM+CR+BF and VC+CR+BF and control under sub-plots. Available N, microbial biomass N (MBN), mineral N, potential mineralizable (PMN), total N and urease enzyme assay were analysed in 0-15 cm soil depth. Results showed that FYM+CR+BF recorded 5.5% and 7.7% higher available N as compared to the FYM alone in both RWMCS and RWCS, respectively. Similarly, an increment of 4.0% and 7.5% in available N was observed with VC+CR+BF over VC alone in both the cropping systems, respectively. MBN ranged from 47.1 mg/kg (control) to 69.6 mg/kg (FYM) under RWMCS and 43.2 mg/kg (control) to 67.6 mg/kg (FYM) under RWCS. Treatments FYM+CR and FYM+CR+BF showed 5.0% and 30% lower ammonical N as compared to FYM alone treatments in RWMCS. Concurrently, in case of RWCS, the magnitude of decrease in ammonical N content was similar (21.1%) both in FYM+CR and FYM+CR+BF. The total mineral nitrogen (NH4 +-N + NO3 - -N) content was significantly influenced by the application of organic manures, crop residues and biofertilizers in both RWMCS and RWCS and their interaction
effects. The FYM+CR+BF treatment recorded highest (56.4 mg/kg) potential mineralizable N (PMN) among all the treatments with an increment of 86.4% and 104% the over control in RWMCS and RWCS, respectively. The VC+CR showed 6.1% and 5.5% higher total N content over the control in RWMCS and RWCS, respectively. The content of urease enzyme ranged from 155.1 μg urea/g soil/h (control) to 230.4 μg urea/g soil/h (VC+CR) and 144.3 μg urea/g soil/h (control) to 233.6 μg urea/g soil/h (FYM+CR) in RWMCS and RWCS, respectively
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Date 2019-12-04T09:57:55Z
2019-12-04T09:57:55Z
2018-07-01
 
Type Research Paper
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/27279
 
Language English
 
Relation Not Available;
 
Publisher Not Available