It is generally only used during the daylight saving time for places that observe Pacific Standard Time (PST) during the non-daylight saving period. As mentioned earlier, most parts of Arizona do not observe daylight saving time, so these parts remain on MST. The Navajo Nation lands, which extend to the states of Arizona, New Mexico and Utah, observe daylight saving time from April to October.
The nature of chaff is different enough from wheat to render it worthy of fire. If you plant a little of the stem or stalk of the wheat plant, it will not grow. If you tried to sell it, you might get a few pennies, but not anything like that of the grain itself.
Fire point, which is a slightly higher temperature, is the temperature at which vapors of the flammable liquid continue to burn after being ignited even after the source of ignition is removed. Both the flash point and fire point have no relation to the temperature of the source of ignition. Flash point is the minimum temperature when there is sufficient concentration of vapors of the flammable liquid in air to sustain burning when there is a source of ignition.