東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Identification of spectral bands to ...

Desta, Birehane Kasaye.

Linked to FindBook

Google Book

Amazon

博客來

Identification of spectral bands to detect nitrogen and phosphorus deficiencies in winter wheat.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Identification of spectral bands to detect nitrogen and phosphorus deficiencies in winter wheat./
Author:	Desta, Birehane Kasaye.
Description:	81 p.
Notes:	Source: Masters Abstracts International, Volume: 48-01, page: 0223.
Contained By:	Masters Abstracts International48-01.
Subject:	Agriculture, Agronomy. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1469160
ISBN:	9781109347654

Identification of spectral bands to detect nitrogen and phosphorus deficiencies in winter wheat.
Desta, Birehane Kasaye.

Identification of spectral bands to detect nitrogen and phosphorus deficiencies in winter wheat. - 81 p.

Source: Masters Abstracts International, Volume: 48-01, page: 0223.

Thesis (M.S.)--Oklahoma State University, 2009.

Past research in winter wheat (Triticum aestivum L.) showed the potential of spectral indices to detect winter wheat phosphorus (P) status although no specific indices were developed. An experiment was conducted at Perkins, OK in 2007/2009 to identify single or combined spectral indices that can detect nitrogen (N) and phosphorus (P) as well as P independent of N deficiency in winter wheat. A randomized complete block design with three replications was employed. Treatments included twelve factorial combinations of three rates of P (0, 34 and 67 kg P ha-1) and four rates of N (0, 56,112,168 kg N ha-1). Four types of spectral radiance measurements were collected and these included a full bandwidth spectrometer (300nm to 1100nm), Greenseeker(TM) sensor, New-experimental 4 band sensor, and digital pictures at four different winter wheat growth stages. Forage and grain yield were collected and measured. Forage and grain N and P as well as postharvest soil residual P contents were determined. Correlation analysis was used to test the relationship between spectral readings vs. forage and grain yield, and forage and grain N and P content of winter wheat. Similarly, stepwise regression procedure was used to select wavelengths and rations of wavelengths that can detect winter wheat N and P status. Analysis of variance (ANOVA) was employed to test the effect of N and P rates on several variables. Spectral reflectances at certain wavelengths were identified from spectrometer data and indices that can detect N and P status of winter wheat were developed. Spectral Phosphorus Indices: SPI1 and SPI2 were developed from 915 nm numerators to 455 nm denominators, and 865 nm numerators to 505 nm denominator wavelengths, each averaged from10 nm bandwidth, respectively were significantly correlated with winter wheat forage P status over the two-year study. Also, these indices were significant for forage N content. Reflectances at single wavelengths, each average from 10 nm band widths between 605 to 695 nm were detected forage P content at Feekes 10 in 2008 and Feekes 7 and 10 in 2009 while the reflectance at wavelengths from 455 to 715 nm and from 815 to 925 nm were consistently correlated with forage N content at the above mentioned growth stages. There was no index, except the promising result of picture index (R/G), that could detect winter wheat forage P content independent of forage N content using the above instruments in the two-year study. This was likely because (1) wavelengths that detect forage P content were found within the range of the wavelengths that can detect forage N status and, (2) Nitrogen rate affected crop biomass and resulted in forage P content dilution as the crop grows.

ISBN: 9781109347654Subjects--Topical Terms:

1018679
Agriculture, Agronomy.

Identification of spectral bands to detect nitrogen and phosphorus deficiencies in winter wheat.
LDR:03710nam 2200301 4500 001 1398105
005 20110907152334.5
008 130515s2009 ||||||||||||||||| ||eng d
020 $a 9781109347654
035 $a (UMI)AAI1469160
035 $a AAI1469160
040 $a UMI $c UMI
100 1 $a Desta, Birehane Kasaye. $3 1676977
245 1 0 $a Identification of spectral bands to detect nitrogen and phosphorus deficiencies in winter wheat.
300 $a 81 p.
500 $a Source: Masters Abstracts International, Volume: 48-01, page: 0223.
500 $a Adviser: William R. Raun.
502 $a Thesis (M.S.)--Oklahoma State University, 2009.
520 $a Past research in winter wheat (Triticum aestivum L.) showed the potential of spectral indices to detect winter wheat phosphorus (P) status although no specific indices were developed. An experiment was conducted at Perkins, OK in 2007/2009 to identify single or combined spectral indices that can detect nitrogen (N) and phosphorus (P) as well as P independent of N deficiency in winter wheat. A randomized complete block design with three replications was employed. Treatments included twelve factorial combinations of three rates of P (0, 34 and 67 kg P ha-1) and four rates of N (0, 56,112,168 kg N ha-1). Four types of spectral radiance measurements were collected and these included a full bandwidth spectrometer (300nm to 1100nm), Greenseeker(TM) sensor, New-experimental 4 band sensor, and digital pictures at four different winter wheat growth stages. Forage and grain yield were collected and measured. Forage and grain N and P as well as postharvest soil residual P contents were determined. Correlation analysis was used to test the relationship between spectral readings vs. forage and grain yield, and forage and grain N and P content of winter wheat. Similarly, stepwise regression procedure was used to select wavelengths and rations of wavelengths that can detect winter wheat N and P status. Analysis of variance (ANOVA) was employed to test the effect of N and P rates on several variables. Spectral reflectances at certain wavelengths were identified from spectrometer data and indices that can detect N and P status of winter wheat were developed. Spectral Phosphorus Indices: SPI1 and SPI2 were developed from 915 nm numerators to 455 nm denominators, and 865 nm numerators to 505 nm denominator wavelengths, each averaged from10 nm bandwidth, respectively were significantly correlated with winter wheat forage P status over the two-year study. Also, these indices were significant for forage N content. Reflectances at single wavelengths, each average from 10 nm band widths between 605 to 695 nm were detected forage P content at Feekes 10 in 2008 and Feekes 7 and 10 in 2009 while the reflectance at wavelengths from 455 to 715 nm and from 815 to 925 nm were consistently correlated with forage N content at the above mentioned growth stages. There was no index, except the promising result of picture index (R/G), that could detect winter wheat forage P content independent of forage N content using the above instruments in the two-year study. This was likely because (1) wavelengths that detect forage P content were found within the range of the wavelengths that can detect forage N status and, (2) Nitrogen rate affected crop biomass and resulted in forage P content dilution as the crop grows.
590 $a School code: 0664.
650 4 $a Agriculture, Agronomy. $3 1018679
650 4 $a Chemistry, Agricultural. $3 1021829
690 $a 0285
690 $a 0749
710 2 $a Oklahoma State University. $b Plant & Soil Science. $3 1272627
773 0 $t Masters Abstracts International $g 48-01.
790 1 0 $a Raun, William R., $e advisor
790 1 0 $a Solie, John B. $e committee member
790 1 0 $a Taylor, Randal K. $e committee member
790 $a 0664
791 $a M.S.
792 $a 2009
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1469160