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After harvesting, fruits undergo complex physiological processes, which do not stop at all stages of storage - during transport, in warehouses and on store shelves. Correct storage conditions play therefore a crucial role in maintaining the commercial quality of products.
It is a known fact that conservation of fresh fruits and vegetables depend largely on the environmental conditions. Optimal storage conditions include regulation of such important parameters as:
- temperature,
- air humidity
- composition of the gaseous medium.
Please find various measuring instruments for the postharvest storage control of fruits and vegetables below or in our English STEP Systems catalog.
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Climate monitoring in storage rooms
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Temperature and humidity:
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Optimal storage conditions in regulated climate
| Crop |
Temperature, °С |
Humidity, % |
Storage period |
| Fruits |
| Grapes |
-0,5 …+14 |
90 - 95 |
5-7 months |
| Pear |
-1 …+1 |
90 - 95 |
untill 10 months |
| Peach |
-0,5 …0 |
90 - 95 |
4-6 weeks |
| Apple |
0 ... +2 |
90 - 95 |
untill 12 months |
| Vegetables |
| Cabbage |
0 ...+1 |
95 - 100 |
3-7 months |
| Potato |
+4 ...+5 |
90 - 95 |
4-8 months |
| Onion |
-1 ...0 |
70 - 80 |
6-8 months |
| Carrot |
0 ...+1 |
95 - 100 |
4-8 months |
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Amount of gas in ambient air:
Ethylene is a plant hormone, which is produced by trees, plants, vegetables, fruit, flowers and tulip bulbs. Many crops are very sensitive to the presence of ethylene in air. Even at very low concentrations, this gas accelerates the ripening of the fruit, so it is also called aging hormone or stress ethylene.
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The analyser is suitable for the measuring and monitoring of the ethylene concentration in the fruit and vegetable storage facilities, greenhouses and scrubber systems.
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- Connecting of the O2 and CO2 sensors (on request).
- Automatic data transfer via the Internet.
- GPRS, UMTS or Ethernet modem to LAN connect
Item-no.: 24050
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Sensitivity of fruits and vegetables to ethylene
| Crop |
Produсtion of ethylene |
Sensitivity to ethylene |
| Fruits |
| Grapes |
Very weak |
Low |
| Pear |
Strong |
High |
| Peach |
Strong |
High |
| Apple |
Strong |
High |
| Vegetables |
| Cabbage |
No |
High |
| Potato |
No |
Middle |
| Onion |
No |
Middle |
| Carrot |
No |
High |
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Fruit quality:
The degree of maturity and fruit quality during storage are determined by values of fruit hardness, - measured by penetrometer, and by the temperature inside the fruit.
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Guide values for fruit hardness
| Fruit |
Cultivar |
Firmness (kg / cm2) |
| Pear |
William´s / Guyot |
6,5 |
| Conference |
5,5 |
| Abate Fetel |
5 |
| Comice |
4,5 |
| Apple |
Staymanred |
7,5 |
| Stark Delicious |
6 |
| Golden Delicious / Granny Smith |
5,5 |
| Plum |
Calita |
2,5 |
| Golden Japan / Ozark Premier |
3 |
| Peach |
Creasthaven, Suncrest,
Flavor Top, Red Haven |
6 |
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COMBI 5000:
international recognition
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TASPO Awards in Germany
The new multi-testing instrument COMBI 5000 from STEP Systems GmbH has been nominated for the TASPO Award 2016, the Oscar of the German green industry, in the category “Innovative Product”.
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