U.S. flagAn official website of the United States government
                    Here's how you know **Official websites use .gov**
                            
                            A **.gov** website belongs to an official government organization in the United States.
 **Secure .gov websites use HTTPS**
                            
                            A **lock** (                            
                              A locked padlock                                                      
                            
                            ) or **https://** means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.


Menu Agricultural Research Service
						
                    U.S. DEPARTMENT OF AGRICULTURE
 Agricultural Systems Research: Sidney, MT
 close



    Research

                    Research Projects
                                    Publications
                                    Collaborations
                                    News
                People

                    Staff Listing
                                    Careers


        


                    NPARL
                        NPARL
                                    Pest Management Research
                                    Grasshoppers: Their Biology, Identification and Management:Search small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




ARS Home Plains Area Sidney, Montana Northern Plains Agricultural Research Laboratory Agricultural Systems Research Research Publications at this Location





- ARS National Programs
- Search for a scientific manuscript
- Search for a research project
- ARS Software
- Programs and Projects
- Collaborations
- Subjects of Investigation
- Publications

Title:   Author  item
                                            Sainju, Upendra
  Submitted to: American Society of Agronomy Meetings
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 8/15/2006
                                    Publication  Date: 11/12/2006
                                    Citation: Sainju, U.M. 2006. Carbon and nitrogen pools in aggregates separated by dry and wet sieving methods. In: American Society of Agronomy Meetings. November 12-16, 2006. Indianapolis, IN. Paper No. 189-1. Page 107.Interpretive Summary:
                                Technical Abstract: Aggregation influence conservation and mineralization of soil C and N but aggregate separation method may influence levels of aggregate amount and C and N pools. We compared aggregate amount and soil organic C (SOC), soil total N (STN), particulate organic C and N (POC and PON), microbial biomass C and N (MBC and MBN), potential C and N mineralization (PCM and PNM), NH4-N, and NO3-N concentrations in aggregates separated by dry and wet sieving methods. The PCM, PNM, MBC, and MBN are considered as active pools, SOC and STN as slow pools, POC and PON as intermediate pools, and NH4-N and NO3-N as available pools. Aggregate separation was made in soil samples from 0 to 5 and 5 to 20 cm depths with various properties and cropping systems in eastern Montana and western North Dakota. Aggregate amount was higher in dry than in wet sieving in 4.75- to 2.00-mm size class but the amount varied between sieving methods in other size classes. In cultivated soil, no definite trends in C pools were observed between aggregate size classes and sieving methods. In no-till grassland soil, C pools were higher in <0.25 mm than in 4.75-2.00 mm aggregates in dry sieving method but the trend reversed in wet sieving method. Nitrogen pools in aggregates were higher in <0.25 mm than in other size classes, regardless of sieving methods. In all aggregates, active and available N pools were 2- to 30-fold higher in dry than in wet sieving method. Dry sieving of moist soil can be a rapid and reliable method of determining soil aggregation and C and N pools compared with wet sieving which increases the destruction physical habitat of microbial habitats in aggregates and limits the determination of water soluble C and N pools.


Return to top


Connect with ARS Sign up


ARS Home
                            USDA.gov
                            Plain Writing
                            Policies & Links
                            Civil Rights Statements
                            FOIA
                            Accessibility Statement
                            Privacy Policy
                            Non-Discrimination Statement
                            Quality of Information
                            USA.gov
                            WhiteHouse.gov