grain drill

grain drill

      machine for planting seed at a controlled depth and in specified amounts. The earliest known version, invented in Mesopotamia (Mesopotamia, history of) by 2000 BC, consisted of a wooden plow equipped with a seed hopper and a tube that conveyed the seed to the furrow. By the 17th century, metering systems were in use to ensure accuracy of the rate of planting; most consisted of wheels bearing small spoons that dipped into the seed hopper and guided it to the furrows in standard amounts.

      Modern grain drills have a variety of metering systems and furrow openers. In general, the metering device—spoon, cup, fluted roll, or other—passes the seed by tube to one of several furrow openers, which are forced into the soil by springs or weights, with a short length of chain dragged behind to cover the seed. Drill widths are determined by the number and spacing of furrow openers.

* * *


Universalium. 2010.

Игры ⚽ Нужен реферат?

Look at other dictionaries:

  • grain drill — noun : a drill for sowing small grains (as of wheat) or fine seeds (as clover seed) see cup drill, shoe drill …   Useful english dictionary

  • drill-barrow — drillˈ barrow noun A grain drill driven by hand • • • Main Entry: ↑drill …   Useful english dictionary

  • Drill — Drill, n. 1. A small trickling stream; a rill. [Obs.] [1913 Webster] Springs through the pleasant meadows pour their drills. Sandys. [1913 Webster] 2. (Agr.) (a) An implement for making holes for sowing seed, and sometimes so formed as to contain …   The Collaborative International Dictionary of English

  • Drill barrow — Drill Drill, n. 1. A small trickling stream; a rill. [Obs.] [1913 Webster] Springs through the pleasant meadows pour their drills. Sandys. [1913 Webster] 2. (Agr.) (a) An implement for making holes for sowing seed, and sometimes so formed as to… …   The Collaborative International Dictionary of English

  • Drill bow — Drill Drill, n. 1. A small trickling stream; a rill. [Obs.] [1913 Webster] Springs through the pleasant meadows pour their drills. Sandys. [1913 Webster] 2. (Agr.) (a) An implement for making holes for sowing seed, and sometimes so formed as to… …   The Collaborative International Dictionary of English

  • Drill harrow — Drill Drill, n. 1. A small trickling stream; a rill. [Obs.] [1913 Webster] Springs through the pleasant meadows pour their drills. Sandys. [1913 Webster] 2. (Agr.) (a) An implement for making holes for sowing seed, and sometimes so formed as to… …   The Collaborative International Dictionary of English

  • Drill plough — Drill Drill, n. 1. A small trickling stream; a rill. [Obs.] [1913 Webster] Springs through the pleasant meadows pour their drills. Sandys. [1913 Webster] 2. (Agr.) (a) An implement for making holes for sowing seed, and sometimes so formed as to… …   The Collaborative International Dictionary of English

  • Drill plow — Drill Drill, n. 1. A small trickling stream; a rill. [Obs.] [1913 Webster] Springs through the pleasant meadows pour their drills. Sandys. [1913 Webster] 2. (Agr.) (a) An implement for making holes for sowing seed, and sometimes so formed as to… …   The Collaborative International Dictionary of English

  • drill-plough — drillˈ plough noun A plough for sowing grain in drills • • • Main Entry: ↑drill …   Useful english dictionary

  • Drill bit — For the fictional character, see Drill Bit (Transformers). For the cancelled skyscraper nicknamed Drill bit, see Chicago Spire. For the types used in drilling wells, see Well drilling. From top to bottom: Spade, lip and spur (brad point), masonry …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”