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:~ <br />3. <br />:; <br /> <br />.~ <br />Dewatered or abandoned irrigated cropland conversion to <br />Rangeland in MLRA G9: <br />a. DuEa to chemical and physical changes that have occurred, <br />speacial procedures are needed to effectively establish <br />vec~etation on these dewatered soils. Dryland planting <br />attempts in this low precipitation zone along with the <br />chE:mical and physical changes of these soils will <br />usually result .n failure of the seeded vegetation. <br />Refer to Part G-2 a-b for additional requirements. <br />b. SeE:dbed preparation is the same as previously described <br />for seedbed preparation for MLRA's 67, 69A, 698, 70, 72, <br />and 77. However, row spacing can be changed to 36-40 <br />. inch spacing to accommodate irrigation furrows, cover <br />crops that can be used remain the same as listed <br />previously for dryland seeding. Residue amounts <br />required for grass seeding remain the same as required <br />previously based on the soil "I" factor. Clipping and <br />re:n~oval of excess ~-,aterial is permitted if not limited <br />by program linitaticns. Irrigation :rill be required to <br />establish an adeauate cover crop. !deed control will be <br />used as needed to obtain a weed free 'cover crop. <br />c. Previously harvested crops of corn, grain sorghum, and <br />' forage sorghums may be~used for cover if adequate <br />residue is left. The residue remaining must meet the <br />soil "I" factor requirements. Production in excess of <br />5,000 pounds residue per acre will be clipped and <br />removed from the field to allow good seed soil contact <br />during the drilling operation. <br />C. Hethods of Grass Seed Plantinc7: <br />1. Drill Method <br />a. The best type of seeding equipment is a grass drill with <br />7-1:2 inch spacing and capable of planting fluffy seeds, <br />equipped with a seedbox agitator, small seedbox, double <br />disc furrow openers with depth bands, and packer wheels. <br />Drills used will be capable of dropping the seed between <br />,~ the double disk openers and not behind them when <br />- - planting light fluffy seed. Fluffy and free-flowing <br />grass seeds will be planted directly into the cover crop <br />. res:Ldue without additional seedbed preparation. The <br />,~,,~^:,~^~ _: grass drill should be operated as near to the contour as <br />~;.; . ~~; ~ ' practical . Tb accurately maintain seeding depth, <br />,~,;., dri]Lling speed is limited to 4 to 4.5 mph. <br />_. ~.r.-b. Drag chains may be used in place of packer wheels only <br />.~ on c9eep sand and similar range sites to prevent seeding <br />'° too deep. <br />TGN~230 (Rev. 2) (Page 8 of i6} SCS Colorado January 1991 <br />4: <br />~j~ <br />