dc.contributor.advisor | Raun, William | |
dc.contributor.author | Nambi, Eva | |
dc.date.accessioned | 2021-09-24T13:33:06Z | |
dc.date.available | 2021-09-24T13:33:06Z | |
dc.date.issued | 2021-05 | |
dc.identifier.uri | https://hdl.handle.net/11244/330885 | |
dc.description.abstract | Nitrogen (N) losses can occur with different fertilizer sources and methods of application. Both N and phosphorus (P) are essential macronutrients for cereal production; however, there is little research done to demonstrate the effect of using different P sources and how these can be applied with N using different methods. The objective of this study was to determine NH4-N effects on sorghum growth when applied pre-plant with different phosphate fertilizers on sorghum grain yield using different methods of application in field conditions. To accomplish this study, we used a randomized complete block design with eleven treatments replicated three times. Urea ammonium nitrate (UAN) was used at the N source; diammonium phosphate (DAP) and liquid ammonium polyphosphate (APP) were used as P sources. The N-P application method was the dual placement of APP and UAN, Broadcast of DAP and UAN, and dribble surface band of APP and UAN. Grain yields were consistently higher when N was applied, 112.1 kg N ha-1 compared with the non-fertilized check. Dual placement of N and P increased grain yields by 35%. Also, the application of 20 kg P ha-1 gave better yield across sites. Application of N and P did not increase grain N except in two site years. The results were inconsistently affected by the method of application and fertilizer source that was shown by lack of effect in some years. N uptake was higher when N and P were dual placed and broadcast compared to the surface band. | |
dc.format | application/pdf | |
dc.language | en_US | |
dc.rights | Copyright is held by the author who has granted the Oklahoma State University Library the non-exclusive right to share this material in its institutional repository. Contact Digital Library Services at lib-dls@okstate.edu or 405-744-9161 for the permission policy on the use, reproduction or distribution of this material. | |
dc.title | Effect of preplant nitrogen and phosphorus application method and source on sorghum (Sorghum bicolor L.) grain yields | |
dc.contributor.committeeMember | Arnall, Brian | |
dc.contributor.committeeMember | Warren, Jason | |
dc.contributor.committeeMember | Weckler, Paul | |
osu.filename | Nambi_okstate_0664D_17197.pdf | |
osu.accesstype | Open Access | |
dc.type.genre | Dissertation | |
dc.type.material | Text | |
dc.subject.keywords | broadcast | |
dc.subject.keywords | dribble surface band | |
dc.subject.keywords | dual placement | |
dc.subject.keywords | growing degree days | |
dc.subject.keywords | normalized difference vegetation index | |
dc.subject.keywords | preplant nitrogen and phosphorus | |
thesis.degree.discipline | Soil Science | |
thesis.degree.grantor | Oklahoma State University | |