Italian Journal of Agronomy, No (3), Year (2008-6) , Pages (243-244)

Title : ( evaluation of chlorophyll meter data for nitrogen fertilizer manegement in maize )

Authors: majid rostami , Alireza Koocheki , Carlo Grignani ,

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In order to achieve high yield of maize farmers in many parts of Iran tend to apply nitrogen fertilizer (N) in excess of the crop requirements. Excessive N input in the beginning of growth season is the major cause of the poor fertilizer efficiency. Only less than 20% of the total N uptake by maize occurs before V8. Environmental and economic considerations require that nitrogen fertilizer should be applied only in quality and time which is strictly justified. Improving N management would eventually depend on the accuracy with which the N status of plant can be assessed. The usefulness of SPAD chlorophyll meter reading for plant N assessment is based on the direct proportionality between the leaf chlorophyll and the leaf N concentration. By using the critical value of SPAD it is possible to determine the best time for N application.

Keywords

, Nitrogen ,
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@article{paperid:1006936,
author = {Rostami, Majid and Koocheki, Alireza and Carlo Grignani},
title = {evaluation of chlorophyll meter data for nitrogen fertilizer manegement in maize},
journal = {Italian Journal of Agronomy},
year = {2008},
number = {3},
month = {June},
issn = {1125-4718},
pages = {243--244},
numpages = {1},
keywords = {Nitrogen ; Chlorophyll},
}

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%0 Journal Article
%T evaluation of chlorophyll meter data for nitrogen fertilizer manegement in maize
%A Rostami, Majid
%A Koocheki, Alireza
%A Carlo Grignani
%J Italian Journal of Agronomy
%@ 1125-4718
%D 2008

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