Calibration of a Minolta SPAD-502 chlorophyll meter for evaluation of the nitrogen nutrition of maize

被引：19
|
作者：
Zotarelli, L
Cardoso, EG
Piccinin, JL
Urquiaga, S
Boddey, RM
Torres, E
Alves, BJR
机构：
[1] Ctr Nacl Pesquisa Soja, EMBRAPA, BR-86001970 Londrina, PR, Brazil
[2] Ctr Nacl Pesquisa Agrobiol, EMBRAPA, BR-23890000 Seropedica, RJ, Brazil
来源：
PESQUISA AGROPECUARIA BRASILEIRA | 2003年 / 38卷 / 09期
关键词：
Avena strigosa; Lupinus albus; green manures; nutritional status;
D O I：
10.1590/S0100-204X2003000900014
中图分类号：
S [农业科学];
学科分类号：
09 ;
摘要：
The subject of this study was the calibration of a Minolta SPAD-502 chlorophyll meter for evaluation of the N nutrition of maize, firstly comparing the chlorophyll readings to the contents obtained from either 80% acetone or N,N-dimethylformamide (DMF) chlorophyll extrators. The chlorophyll of the maize leaves cultivated under zero-tillage after oat and lupin for two consecutive harvests was evaluated in a field experiment. The chlorophyll extraction after 72 hours in DMF solution, was the most suitable for the calibration of the SPAD-502 chlorophyll meter for maize and its use was coherent with the nutritional status of the crop.
引用
收藏
页码：1117 / 1122
页数：6
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