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.
Walla Walla onions planted from sets mature earlier than other varieties of onions and can be harvested when the sweet onion bulbs are full sized and the tops fall over. Plant the sets in the spring as soon as the soil has dried enough not to stick to your gardening tools.pace the rows 12 to 24 inches apart. Place a Walla Walla onion set in the row every 3 to 4 inches. Cover the sets with soil, but do not firm the soil over the top of the sets.