Asparagus grows best at 18 to 22°C. In a warmer environment the asparagus stalks get hollow and ridged and the spear heads open too early. Such asparagus is hard to sell. The losses can be as high as 30% of the total harvest.
Picture 1: Influence of the mound temperature on the quality of the asparagus according to . Spears with open heads: Grolim 2002. Grade I: Gijnlim 2002.
In a colder environment asparagus grows slowly. The temperature in the mound can be controlled using a two-colored cover. If the black side of the cover is turned towards the sun the mound is heating up, with the white side up the mound is cooling down. But it is necessary to know the set point temperature in order to control it correctly. For this purpose a single measurement a day isn’t sufficient. Instead it is essential to know the average temperature, aggregated by several measurements taken intraday at the same spot. Every day. Now there is a solution for this purpose: Deepfield® Connect - Asparagus Monitoring.