Freebase(0.00 / 0 votes)Rate this definition: Chemical property. A chemical property is any of a material's properties that becomes evident during a chemical reaction; that is, any quality that can be established only by changing a substance's chemical identity.
Ground Temperature. The best time to plant your corn seeds is when the soil temperature reaches an average of 50 degrees Fahrenheit. You can determine the average ground temperature in your garden using a soil thermometer -- available at most garden stores.
Ideally, the soilâs acidity should lie between 5.8 and 6.8, a bit on the alkaline side. Adding compost prior to planting increases levels of nitrogen, of which sweet corn is a heavy feeder. Some people start their sweet corn seeds indoors about two to three weeks before the threat of last frost.