Monitoring leaf nitrogen status with hyperspectral reflectance in wheat

2008 ◽  
Vol 28 (3) ◽  
pp. 394-404 ◽  
Author(s):  
W. Feng ◽  
X. Yao ◽  
Y. Zhu ◽  
Y.C. Tian ◽  
W.X. Cao
Keyword(s):  
Leaf Nitrogen ◽  
Hyperspectral Reflectance ◽  
Nitrogen Status

Estimation of Canopy Leaf Nitrogen Status Using Imaging Spectrometer and Digital Camera in Cotton

2011 ◽  
Vol 37 (6) ◽  
pp. 1039-1048 ◽  
Author(s):  
Fang-Yong WANG ◽  
Ke-Ru WANG ◽  
Shao-Kun LI ◽  
Shi-Ju GAO ◽  
Chun-Hua XIAO ◽  
...  
Keyword(s):  
Digital Camera ◽  
Leaf Nitrogen ◽  
Nitrogen Status ◽  
Imaging Spectrometer

scholarly journals Potential of UAV-Based Active Sensing for Monitoring Rice Leaf Nitrogen Status

2018 ◽  
Vol 9 ◽  
Author(s):  
Songyang Li ◽  
Xingzhong Ding ◽  
Qianliang Kuang ◽  
Syed Tahir Ata-UI-Karim ◽  
Tao Cheng ◽  
...  
Keyword(s):  
Leaf Nitrogen ◽  
Active Sensing ◽  
Nitrogen Status ◽  
Rice Leaf

Leaf Nitrogen Status as a Main Contributor to Yield Improvement of Soybean Cultivars

2011 ◽  
Vol 103 (2) ◽  
pp. 441-448 ◽  
Author(s):  
Jian Jin ◽  
Xiaobing Liu ◽  
Guanghua Wang ◽  
Judong Liu ◽  
Liang Mi ◽  
...  
Keyword(s):  
Leaf Nitrogen ◽  
Nitrogen Status ◽  
Yield Improvement ◽  
Main Contributor ◽  
Soybean Cultivars

Predicting the Photosynthetic Capacity and Leaf Nitrogen of Woody Bioenergy Crops from Hyperspectral Reflectance Models

2021 ◽  
Author(s):  
Thu Ya Kyaw ◽  
Heidi Renninger ◽  
Courtney Siegert ◽  
Padmanava Dash ◽  
Krishna Poudel
Keyword(s):  
Photosynthetic Capacity ◽  
Leaf Nitrogen ◽  
Bioenergy Crops ◽  
Hyperspectral Reflectance

A non‐destructive and real‐time method of monitoring leaf nitrogen status in wheat

2007 ◽  
Vol 50 (5) ◽  
pp. 935-942 ◽  
Author(s):  
X. Yao ◽  
W. Feng ◽  
Y. Zhu ◽  
Y. C. Tian ◽  
W. X. Cao
Keyword(s):  
Real Time ◽  
Leaf Nitrogen ◽  
Nitrogen Status ◽  
Non Destructive

Estimating nitrogen status of rice canopy using hyperspectral reflectance combined with BPSO-SVR in cold region

2018 ◽  
Vol 172 ◽  
pp. 68-79 ◽  
Author(s):  
Kezhu Tan ◽  
Shuwen Wang ◽  
Yuzhu Song ◽  
Yao Liu ◽  
Zhenping Gong
Keyword(s):  
Hyperspectral Reflectance ◽  
Cold Region ◽  
Nitrogen Status

Leaf nitrogen as a guide for fertilising macadamia

1997 ◽  
Vol 37 (5) ◽  
pp. 599 ◽  
Author(s):  
R. A. Stephenson ◽  
E. C. Gallagher ◽  
V. J. Doogan
Keyword(s):  
Nitrogen Nutrition ◽  
Current Trend ◽  
Leaf Nitrogen ◽  
Nitrogen Status ◽  
Oil Accumulation ◽  
Inflorescence Development ◽  
Experimental Block ◽  
High Yields ◽  
The Relationship ◽  
Low Nitrogen

Summary. Despite the lack of evidence for a critical level of leaf nitrogen in macadamia, fertiliser management has been largely based on tentative standards for high yielding trees. Trees on a lower plane of nitrogen nutrition, however, produced higher yields of good quality nuts. This study was therefore carried out to establish the relationship between yield and nitrogen status of trees. Three rates of nitrogen fertiliser (0.5, 1.5 and 2.5 kg urea/tree . year; 230, 690 and 1150 g nitrogen respectively) were applied to macadamia trees in 1 of 5 application strategies: 1 application in April (floral initiation); 2 applications, one in April and one in June (inflorescence development); 3 applications, April, June and November (rapid nut growth and premature nut drop); 4 applications, April, June, November and January (oil accumulation); and 12 monthly split applications. Multiple applications were all equal in size. The association between high yields and low nitrogen status was confirmed. In some, but not all, years, yield was negatively correlated with leaf nitrogen, accounting for 47 and 59% of the variation in yield of commercially acceptable nuts (>19 mm diameter) in 1991 and 1993, respectively. It is therefore recommended that the standard for leaf nitrogen in macadamia be lowered from 1.4–1.5 to 1.3% under Australian conditions. These results raise concerns at the current trend for leaf nitrogen to be as high as 1.8%. It would be prudent to cease nitrogen applications on at least a small experimental block until leaf nitrogen declined to 1.3% and then maintain this level for at least 3 years and monitor yields.

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