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4 <br />~, <br />]. DewaterE~d or abandoned irrigated cropland conversion to <br />Rangeland in MLRA G9: <br />i . <br />a. Oue to chemical and physical changes that. have occurred, <br />special procedures are needed to effectively establish <br />veq+atation on these dewatered soils. Dryland planting <br />att+empts in this low precipitation zone along with the <br />chemical aid physical changes of these soils will <br />usually result .n failure of the seeded vegetation. <br />Ref+?r to Part G-2 a-b for additional requirements. <br />b. Seedbed preparation is the same as previously described <br />for seedbed preparation for MLR.A'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 />cro~os 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~~val of a}:cess ,-,aterial is permitted if not limited <br />by ~~rogram limitaticns. Irrigation :Jill be required to <br />establish an adeouate cover crop. '.deed control will be <br />used as needed to ootain a weed free"cover crop. <br />c. Previously harves~ed 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 altow good seed soil contact <br /> during the drilling operation. <br />C. Methods of Grass Seed Planting:. <br />1 , Dril l M~eChod <br />a. The best type of seeding equipment is a grass drill with <br /> 7-12 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 />T - pla:ntinq light fluffy seed. Fluffy and free-flowing <br /> grass seeds will be planted directly into the cover crop <br /> residue without additional seedbed preparation. The <br />,,..: <br />, <br />, <br />~ <br />_;" <br />~ grass drill should be operated as near to the contour as <br />,,, <br />• <br />, <br />, <br />;~;_~~;," practical. Tb accurately maintain seeding depth, <br />_ <br />""~ ,~_.• drilling speed is limited to 4 to 4.5 mph. <br />~r <br />'b, pra~~ chains may be used in place of packer wheels only <br />• <br />~• _ on deep sand and similar range sites to prevent seeding <br />'" too deep. <br />TGNM230 (Rev. 2} (page 8 of 16} SC5 Colorado January 1991 <br />~~~ <br />