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Features

Wheat, Rice, Corn, Cotton and beyond

Rice

Cotton

Trend graph display

Changes in measurement data over time can be seen, 
and abnormal values can be noticed at a glance.

Compact and lightweight for portability

The SPAD-502Plus is small enough to fit in a pocket and 
is extremely lightweight (only 200 g) so it can be easily 
taken anywhere.

Quick, easy measurements

Measurements are taken by simply inserting a leaf and 
closing the measuring head. It is not necessary to cut 
the leaf, so the same leaf can be measured throughout 
the growing process. 

Water-resistant

The SPAD-502Plus is water-resistant (IPX-4), so it can be 
used outside even in the rain.

*It is not immersible, and should not be cleaned with water.

Low power consumption

The SPAD-502Plus uses LED light sources, resulting in 
extremely low power consumption. One set of two AA-
size alkaline-manganese batteries can provide approxi-
mately 20,000 measurements.

Small measuring area

The measuring area is only 2 x 3

 

mm, allowing measurements 

of even small leaves. A sliding depth stop is included for 
accurate positioning on sample leaves.

High accuracy

High measuring accuracy (± 1.0 SPAD unit for rice-plant 
leaves) allows close examination of growing conditions.

Nitrogen management

Nitrogen (N) management is a very important issue for plant growers 
and for the environment.
For  growers,  knowing  the  N  requirement  of  plant  enables  the  proper 
amount of N fertilizer supply to be managed.
Some experiments show that the SPAD series contributed to reductions 
in the use of N fertilizer by tens of percents with no loss in yield. 
By optimizing the N fertilization efficiency in the field, proper N ferti-
lizer management reduces the possiblity of excessive supply of fertilizer, 

Data memory

The SPAD-502Plus has memory space for 30 measurements. 
Data in memory can be recalled or deleted at a later time, and 
the average value of all data in memory can be automatically 
calculated.

Reading checker

A reading checker enables users to check that the SPAD-502 is 
functioning correctly and providing accurate readings.

Names of parts

 

which can cause diseases in plants and environmental contamination.
There  is  increasing  awareness  of  the  need  for  applying  the  proper 
amount of N fertilizer in respect to water contamination in both flowing 
streams and underground water due to nutrient leaching through the 
field's soil. 
The SPAD series is playing a significant role in day to day development of 
N fertilizer application techniques.

Measuring head
Measurement center line

Press here to close.

Power switch

Receptor 

window

Depth stop

Display

ALL DATA CLEAR button

AVERAGE button

1 DATA DELETE button

DATA RECALL button

Battery-chamber cover

N=

30

AVG

35.8

Memory data count

Average

Error message

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