Evaluation of the Minolta SPAD-502 meter for nitrogen management of oilseed rape

Zhe-yan Zhu; Yong He; Min Huang

doi:10.1117/12.710975

27 October 2006 Evaluation of the Minolta SPAD-502 meter for nitrogen management of oilseed rape

Zhe-yan Zhu, Yong He, Min Huang

Proceedings Volume 6047, Fourth International Conference on Photonics and Imaging in Biology and Medicine; 604743 (2006) https://doi.org/10.1117/12.710975
Event: Fourth International Conference on Photonics and Imaging in Biology and Medicine, 2005, Tianjin, China

Abstract

Nitrogen is important for oilseed rape production and even moderate deficiencies will substantially reduce yield and profit, but excessive N can pollute both surface and ground water. Thus, farmers are walking a thin line. In order to find the relationship between the SPAD value and the nitrogen content of oilseed rapes, a Minolta SPAD-502 Meter can be used for on-farm measurement of the N content, and then the Kjeldahl method has been used for measuring the nitrogen content of these oilseed rapes. Every leaf had 10 points SPAD value in average for measuring by SPAD, according to the area of the leaves, the points were increased or decreased. The Kjeldahl method has been used for organic nitrogen determination for over a century. Before using the Kjeldahl method to measuring the nitrogen content, all the leaves has been washed and dried. The results of these two methods has been fitted, as a result, the correlation coefficient is 0.863. Another sample was used to check if the result was perfect, the error of the forecasting value is about 7.4%. A new method for measuring the nitrogen content quickly of oilseed rapes has been found, the nitrogen content of the oilseed rape can be measured nondestructively and quickly.

Citation Download Citation

Zhe-yan Zhu, Yong He, and Min Huang "Evaluation of the Minolta SPAD-502 meter for nitrogen management of oilseed rape", Proc. SPIE 6047, Fourth International Conference on Photonics and Imaging in Biology and Medicine, 604743 (27 October 2006); https://doi.org/10.1117/12.710975

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available