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2020 Harrells Balanced Approach Customer Agronomic Program …
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2021 Balanced Approach Agronomic Program Planning Guide -FL
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At Harrell’s we are dedicated to helping you succeed through quality products and valuable services. Our two employee-owner Ph.D’s work in cooperation with TurPh.Dudes all across the country bringing you the latest industry research to help you succeed day-in and day-out.
Dr. Raymond Snyder Director of Agronomy
Dr. Jeff Atkinson Director of Agronomy
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Use the tables on this page to assess the impact of irrigation water on plant quality
Table 1. Total salinity hazard classification guidelines for variable quality irrigation water based on Electrical Conductivity (ECw) and Total Dissolved Salts (ppm). Salinity Hazard Class ECw (dS/m) Total Dissolved Salts (ppm) Potential Injury & Management Requirements Low 2,000 Damage to plants with high tolerance to salinity may occur. Use salt-tolerant plants. Site must have good drainage. Excess irrigation for drainage.
Table 2. Salt tolerance of selected turfgrass species. Tolerance Species ECw (dS/m) ppm Excellent Seashore paspalum >10 6,500 Good Bermudagrass Perennial ryegrass St. Augustinegrass Zoysiagrass 6-10 4,000 -6,500 Fair Annual ryegrass 3-6 2,000 - 4,000 Poor Bahiagrass Poa annua Poa trivialis 210
w
355 >3 >100
w
24
very high Na water Unsatisfactory except with high salinity (>2dS/m), high Ca levels, and use of gypsum
Table 8. Interaction of sodium adsorption ratio of water (SAR w ) and electrical conductivity of water (EC w ) on soil water infiltration. Irrigation water influence on soil permeability SAR w & EC w No Restrictions Slight to Moderate Restriction Severe Restriction SAR w = EC w = 0 – 3 >0.7 0 – 3 0.7 - 0.2 0 – 3 1.2
3 – 6 1.2 – 0.3 6 – 12 1.9 – 0.5 12 – 20 2.9 – 1.3 20 – 40 5 – 2.9
3 – 6 1.9
6 – 12 2.9 20 – 40 >5.0
12 – 20