WSPC02374

• File Number: 8064.100
• Description: Ute Tribes
• State: CO
• Basin: San Juan/Dolores
• Water Division: 7
• Date: 12/1/1986
• Author: Boyle Engineering
• Title: Southern Ute and Ute Mountain - Ute Indian Reservations - Agronomy Study - Sections 6-Appendix A
• Water Supply Pro - Doc Type: Report/Study

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better than many other crops; however, extremely high temperatures

during the fruiting period may reduce yield. Based on grain sorghum
growth characteristics and prevailing climatic conditions,

irrigated grain sorghum is suited to climatic zones A through E with

the best potential for obtaining high yields in Zones A and B.

Climatic conditions summarized in Section 4 impact the suitability

of grain sorghum to produce economic yields in different climatic

zones. Table 6.28 summarizes irrigated grain sorghum suitability

and estimated potential yield for each climatic zone.

In general, grain sorghum is grown successfully on most types of
soils. Where water availability is not a limitation, highest yields
are obtained on heavy soil: however, in less favorable moisture
conditions, the crop does best on medium textured to sandy soils.
Grain sorghum is moderately tolerant to soil salinity and can be
grown on soils with salt concentrations less than 4 mmhos/cm without

decreases in yield.

Irrigation of grain sorghum with saline water can result in reduced

yields. Application of irrigation water with salt concentrations
greater than about 2700 micromhos/cm may reduce grain sorghum
yields. Table 6.29 summarizes the impact of irrigation water
salinity on potential yield based on anticipated water sources for
the Ute Indian Reservations as identified in Section 4 (see Table
4.1). Salt concentrations in these irrigation water sources vary

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