2008 Joint Annual Meeting (5-9 Oct. 2008): Identification of Spectral Bands for Detecting Phosphorus and Nitrogen Deficiency in Winter Wheat.
Start | Author Index

771-1 Identification of Spectral Bands for Detecting Phosphorus and Nitrogen Deficiency in Winter Wheat.



Wednesday, 8 October 2008
George R. Brown Convention Center, Exhibit Hall E
Birehane K. Desta, Plant and Soil Sciences, Oklahoma State University, 159 Agriculture Hall, Stillwater, OK 74078, Daryl B. Arnall, Oklahoma State University, 2605 W. 6th, Agronomy Farm Bld 615, Stillwater, OK 74078, Yumiko Kanke, Oklahoma State University, 368 Ag. Hall, Stillwater, OK 74078 and William R. Raun, 044 N. Ag Hall, Oklahoma State University, Oklahoma State University, Dept. of Plant & Soil Sciences, Stillwater, OK 74078-0507
Past research in winter wheat showed the potential of spectral indices to detect plant P (phosphorous) status although no specific indices were developed so far. An experiment was conducted at Perkins, OK in 2007/2008 to develop and evaluate spectral indices that can detect P and NP (nitrogen and phosphorus) deficiency in winter wheat. A randomized complete block design with three replications was employed. Treatments included factorial combinations of three rates of P (0, 34 and 67 kg P ha-1) and four rate s of N (0, 56,112,168 kg P ha-1). Four types of spectral measurements, namely, Spectrometer, green seeker sensor, four band sensor, and digital pictures were taken from each plot at Feekes 4, 5, 7 and 10. Additionally, wet and dry forage yield and forge P content were determined. Correlation analysis was used to test the relationship between the spectral readings and wet and dry forage yield, and forage P content of each treatment. This study will help to develop indices used to identify plant P deficiency independently and N and P in combination. The advantage of the index is to evaluate the mid season winter wheat P and NP status and to take an appropriate measure to maximize crop yield.
See more of: Assessment of Soil Properties and Nutrient Status with In-Field Measurement (Posters)
See more of: S08 Nutrient Management & Soil & Plant Analysis