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

下载

页码：1117 / 1122

页数：6

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