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See also:SOWING (from "to sow," O. Eng. shwan, cf. Du. zaaijen, Ger. saen, &c.; the See also:root is seen in See also:Lat. severe, cf. "See also:seed")
, in See also:agriculture, the planting of See also:seed for the raising of crops
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The scattering of seed by See also:hand is the simplest and See also:oldest method of delivering seed to the See also:earth, and is still preferred by some farmers and in certain circumstances
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The sower carries the receptacle for the seed, a See also:zinc " seed-See also:lip," seed-See also:sheet or See also:basket, slung over his See also:shoulder, and walking up and down the ridges of the See also: A spindle geared to the ground-wheels by cogs passes longitudinally through the centre of this section and carries disks, See also:round the rims of which are fitted small cups . As the horses pull the drill forward, the spindle and disks revolve and the cups See also:scoop up the seed and pour it into the funnels; thence it proceeds down a See also:series of tubes or " spouts " and drops into shallow furrows traced by small coulters travelling immediately in front of the streams of seed . The coulters can be raised or lowered by levers and are kept down to their work by weights or pressers, which can be regulated according as deep or shallow sowing is required . In the force-feed type of drill the seed falls through apertures in the bottom of the seed-hopper into funnels, through which extends a See also:shaft carrying bowl-shaped wheels, one for each (fig . I) . These wheels are either spirally-grooved inside or else cogged and serve to feed the seed regularly into the tubes . Instead of coulters, the drill is often fitted with shoes or revolving disks, similar in See also:action to those of the disk-See also:harrow . The tooth and See also:brush pinion, the perforated disk and the See also:chain feed drills, are other types differentiated according to the method by which the seed is " fed " from the hopper and the See also:kind of See also:crop being sown . Liquid-manure drills distribute chemical manure mixed with See also:water and are often fitted with a seed-box for root seeds, the manure and the seed being deposited through the same spout . Drills are also made in which dry fertilizers may be deposited with the seed in a similar manner . The wheelbarrow seeder, a long box pierced with openings and carried transversely on a See also:skeleton wheelbarrow, is used for sowing grass seed . ' The machine devised by See also:Josiah Worlidge about 1669 was ineffective in practice and differed totally in structure from that of Tull . In the See also:United States the See also:maize or See also:Indian-corn crop exceeds all others in value, and machines used in planting and handling this crop are of See also:great importance . Corn (maize) is sometimes listed or planted in a continuous See also:row like See also:wheat, and for this purpose a machine known as a See also:lister is employed . In its See also:general construction this machine is a sulky plough, having a See also:double See also:mould-See also:board, which turns the furrow in both directions . Immediately behind the plough is a sub-soiler for deepening the furrow and penetrating to the moist See also:soil below the See also:surface . A seed-box is mounted on the plough See also:beam, and is prppided with a feed-See also:plate operated by a shaft geared to one of the wheels . The seed is delivered to the furrow in See also:rear of the mould-boards and covered by two shovels fixed behind which turn the soil back into the furrow . It is, however, more common to plant maize in hills, which are spaced equally from each other and See also:form rows in both directions, so that a See also:cultivator may be driven between them . This work is done by a machine called a check-row corn planter . In using the corn planter, a See also:wire, having buttons attached thereto, at intervals corresponding to the distance between the hills, is first stretched across the field and anchored at its ends . This wire is then placed upon the See also:guide rollers at the See also:side of the machine and passes between the jaws of a forked See also:lever, which is connected at its other end with a See also:rock-shaft passing across the machine and serving to oscillate a feed-plate in the bottom of each seed-hopper . As the buttons on the check-wire strike the forked lever, the latter is See also:drawn to the rear and causes the feed-plate to drop the seed through the tubes into the open space between the plates of the furrowing See also:shoe . A See also:reel at the rear of the machine is used to take up the check-wire as the planter progresses . In another corn planter the check-wire is dispensed with, and the machine is provided with a shaft carrying two reels, the See also:blades of which are at a distance apart equal to the distance between the hills of corn, and thus measure the intervals at which the corn is to be dropped . A See also:rod, extending from the side of the machine, and carrying a small See also:wheel, marks the next row and serves as a guide to the See also:driver . See J . B . See also:Davidson and L . W . See also:Chase, See also:Farm Machinery and Farm See also:Motors, p . 132 (New See also:York, 1908) . |
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