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Description: Row crop (e.g., corn and soybeans) planters such as this and NAL #4802 usually are used after the soil has been tilled in a previous operation. However, some such as the small grain (e.g., wheat and barley) planters in NAL #4803 and #4804 are designed with soil tillers such as a disk or chisel plow in front of the planter, so the entire tilling and planting may be completed in one pass. All of these planters usually include: a) separate bins for seed and fertilizer; b) mechanisms to insert seed and fertilizer into the soil; c) rollers or crushers to compact soil over the seed and fertilizer; and d) an arm that marks the center of the route for the next pass of the planter. Planters for small grains may also have separate bins for sowing a legume such as alfalfa, so that the grain may serve as a "nurse crop" for the legume's first growing season. The grain planter in NAL #4805 is for minimal tillage, disking and planting in a single pass. The density of planted seeds and the depth at which the seed is deposited are adjustable. Depth of planting is usually about 1 to 1.5" for corn, and about 1" small grains. The interval to germination depends mostly on soil moisture and temperature.

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