Chloride Fertilization of. Kim Polizotto, Ph.D. Senior Agronomist
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1 Chloride Fertilization of Wheat in North America Kim Polizotto, Ph.D. Senior Agronomist PotashCorp
2 History of Chloride Fertilization Chloride recognised as an essential nutrient in 1954 (Broyer et al) Required in very small amounts for crop growth (~100 mg kg -1 ) Deficiency induced in nutrient solutions Cl - widespread in soil and water Responses considered unlikely in field Potential role of Cl - in cropping systems recognized in the 1970s in the Phillippines, Europe and northwestern U.S. Yield increases from Cl - application verified in the field in Oregon (Christensen et al, 1981)
3 Winter Wheat Grain Yield as Function of N Source 8 7 Grain Yield (T ha -1 ) (NH4)2SO4 NH4Cl Ca(NO3)2 0 Site A Site B Christensen et al. (1981)
4 Take-all root rot of winter wheat was reduced by KCl in Oregon
5 Cl - has improved crop yields in the Great Plains Over 210 trials in KS, MN, MT, ND, SD, MB and SK have evaluated Cl - response in wheat and barley Significant yield response in 48% of trials Average response of 315 kg/ha Cl - responses also occurred in other crops
6 Yield Increase May Be Due To Disease Suppression Wheat: take-all root rot, common root rot, fusarium root rot, stripe rust, leaf rust, septoria, tanspot Barley: common root rot, fusarium root rot, spot blotch Corn: stalk rot
7 Foliar disease severity in flag leaves and grain yield for Butte spring wheat, Flandreau, S.D. % disease severity = % of flag leaf affected by the indicated disease at milk stage.
8 Response of Spring or Durum Wheat Cultivars to Cl - Fertilization 7 6 Responsive Non-responsive 1 Yield Respo onse (bu acre - 1 ) Karma Plenty Barrie Taber CDC C Teal Gra andin 0 Grant et al. 2000
9 Chloride - An Essential Plant Nutrient Chloride... accelerates plant development days for winter wheat days for spring wheat reduces lodging suppresses diseases - root & leaf diseases
10 0 kg Cl - /ha 17 kg Cl-/ha Improved growth, advanced maturity
11 Physiological Leaf Spot Physiological Leaf Spot
12 US Winter Wheat Harvested Acres
13 US Other Spring Wheat Harvested Acres
14 Median ammonium acetate equivalent soil test K levels, 2005.
15 Where Are Chloride Soil Test Levels Low? Regions where Cl - deposition from rainfall is low. Regions where rainfall is high enough to leach Cl - Regions where KCl fertilizers are little used Sandy and low OM soils
16 Chloride Soil Testing Chloride is now part of the micronutrient soil test package for most soil testing labs in the U.S. and Canada.
17 Chloride Soil Test Guidelines* (Cl (kg/ha 0.6 m depth) Low <34 Medium Sufficient >67 *International Plant Nutrition Institute (IPNI)
18 Soil testing can help predict Cl - response Response Category Soil Cl Frequency Average (kg/ha 0.6 m) % kg/ha Low < Medium High > 67 <1 20 Based on responsive spring wheat varieties grown at 36 locations in South Dakota.
19 Soil Testing and Chloride? The chloride anion (Cl - ) is very mobile with water. Higher Cl - levels observed in different landscape positions,, lower in upper slope (Franzen, ND). Topography effects are different depending on the weather (Schoenau, SK)
20 Relationship of Sampling Depth on Soil Chloride Levels in Oklahoma Distribution % 40 <34 kg/ha kg/ha 30 >67 kg/ha cm 0-60 cm Sampling Depth Hailin Zhang, Oklahoma State university
21 Chloride Fertilizer Application Cl is very soluble... Placement is flexible: broadcast = banded = topdress Seed-placement is very effective but application rates are lower due to concern for salt injury. 45 kg/ha KCl or less when placed with the seed.
22 Yield and test weight of Pioneer 2158 winter wheat as affected by timing of NH 4 Cl application (45 kg/ha), Texas 1 4 Parameter Fall Cl Spring Cl Control (0 Cl) Yield (kg/ha) a* b a4 Test weight 58.0b 60.0c 56.0a (lbs/bu) % Plant Cl** 0.28a 0.73b 0.29a * P=.05 ** Determined on whole plant samples at anthesis 1 These results illustrate that in high moisture environments, spring topdress Cl applications are more effective in suppressing leaf rust and increasing yield than fall pre-plant applications.
23 Gracias
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