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, Upendraitem
                                            WANG, SHIRLEY - FORT VALLEY STATE UNIVitem
                                            SINGH, BHARAT - FORT VALLEY STATE UNIVitem
                                            WHITEHEAD, WAYNE - FORT VALLEY STATE UNIV
  Submitted to: World Congress of Soil Science
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 3/24/2006
                                    Publication  Date: 7/9/2006
                                    Citation: Sainju, U.M., Wang, S., Singh, B.P., Whitehead, W. 2006. Soil and crop nitrogen as influenced by tillage, cover crops, and nitrogen fertilization. World Congress of Soil Science, July 9-15, 2006, Philadelphia, PA. Paper No. 155-148. Page 141.Interpretive Summary:
                                Technical Abstract: Soil and crop management practices may influence soil mineral N, crop N uptake, and N leaching. We evaluated the effects of three tillage practices [no-till (NT), strip till (ST), and chisel till (CT)], four cover crops {legume [hairy vetch (Vicia villosa Roth)], nonlegume [rye (Secale cereale L.)], vetch + rye biculture, and winter weeds or no cover crop}, and three N fertilization rates (0, 60 to 65, and 120 to 130 kg N ha-1) on soil NH4-N and NO3-N contents at the 0 to 120 cm depth and N uptake by cotton (Gossypium hirsutum L.) and sorghum [Sorghum bicolor (L.) Moench] from 2000 to 2002 in central GA. Nitrogen in cotton, sorghum, and cover crop residues (stems + leaves) was returned to Dothan sandy loam (fine-loamy siliceous thermic Plinthic Paleudults). Nitrogen supplied by cover crops was higher in vetch and vetch + rye than in rye and weeds. Soil NH4-N content at 0 to 30 cm was higher at harvest than at planting of cotton and sorghum and higher in NT or vetch with 120 to 130 kg N ha-1 than with other treatments. The NO3-N content at 0 to 120 cm varied with date of sampling and was higher with vetch than with rye and weeds. The NO3-N content at 0 to 10 cm was higher in CT with vetch than in NT and ST with rye or weeds. From November 2000 to April 2001 and from November 2001 to April 2002, N loss from crop residue and soil at 0 to 120 cm was higher with vetch than with other cover crops, probably due to leaching. Nitrogen removed by cotton lint and seed was higher with rye than with other cover crops in 2000 and higher with 0 and 60 than with 120 kg N ha-1 in 2002 but N removed by sorghum grain and cotton and sorghum biomass were higher with vetch than with rye and higher with 120 to 130 than with 0 kg N ha-1. Because of higher N supply, vetch increased soil mineral N and cotton and sorghum N uptake compared with rye but also increased the potential for N leaching, regardless of tillage and N fertilization. The potential for N leaching can be reduced and crop N uptake can be optimized by mixing vetch with rye.


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