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Show PART VI FRAMEWORK PLAN AND ALTERNATIVES However, they will also be multipurpose. Development of new irrigated land requires installation of new canals and ditches, land leveling and smoothing, and water control structures. An estimated 176,000 acres or 30 percent of the newly developed land will require on-farm and project- type drains. Dry Cropland About 100,000 acres of the 603,000 acres of presently dry cropland will be transferred to other uses, primarily to irrigation. Improved cul- tural management practices applied to dry cropland would result in a small increase in yields. The programs for increasing production on these lands include: (l) use of improved plant varieties, (2) fertilization, (3) reduction of erosion by contour and cross-slope tillage, (k) con- structing 100 miles of diversion ditches, (5) establishment of grass wa- terways covering 3?000 acres, (6) fall chiseling on 100,000 acres annu- ally in areas of deep snow accumulation, and (7) limited tillage using stubble-mulch methods on 150,000 acres annually. Fall chiseling of wheat stubble makes soil receptive to winter moisture and reduces erosion. 62 |