Air column: space within the percussion instrument that determines the pitch. Percussion: sounds produced by striking the instrument with a mallet or stick, or striking one instrument against another. 2. Review the process of forming a hypothesis and making a prediction.
Dig short, shallow rows. The rows should be no more than 1/2 inch (1.5 centimeters) deep and spaced 4 inches (10 centimeters) to 6 inches (15 centimeters) apart. 3. Drop the seeds into the rows. Space the seeds approximately 1 inch (25 millimeters) apart in order to allow the onions enough room to grow and mature.
1 Plant onions as soon as the ground can be worked in the spring, usually late March or April. 2  Make sure temperature doesnât go below 20 degrees F. 3  For sets or transplants, plant the smaller sets 1 inch deep, with 4 to 5 inches between each plant and in rows 12 to 18 inches apart. Select a location with full sun where your onions won't be shaded by other plants. 2  Soil needs to be well-drained, loose, and rich in nitrogen; compact soil affects bulb development. 3  Till in aged manure or fertilizer the fall before planting. 4  Onions are heavy feeders and need constant nourishment to produce big bulbs.