Micronutrients

1
Micronutrients

• Gordon Johnson, Bill Raun, Hailin Zhang
• Department of Plant and Soil Sciences
• Oklahoma State University

2
The Nutrients Concentrations in Soils and Plants
(continued).
Micronutrients
3
The Nutrients Likelihood of crop deficiencies
and common fertilizer.
Micronutrients
4
Leaf spotting showing Cl deficiency
Cl treated
5
Soil testing for chloride.

• Mobile nutrient in soil.
• Need 0-24 depth for accurate estimate of soil
  supply.
• Amount required in soil should be related to
  yield goal.

6
Soil testing for chloride and sulfate.

• Results of 1999 soil test survey of S and Cl.
• Over 200 paired surface and subsoil samples.
• 17 counties.
• Cl 31 429.
• S 40 - 735.

7
Soil testing for chloride and sulfate average
values.
8
Distribution of chloride in surface and 24 soil
layers.
9
Kansas State University 1998-99 chloride-winter
wheat research.

• Test site soil Cl levels were 7, 7 and 15 lb/ac
  0-24.
• Yields ranged from 60 115 bu/acre.
• Response ranged from 0 to 15 bu/acre.

10
Kansas State University 1998-99 chloride-winter
wheat research.

• Response is variety specific.
• Cimarron and Triumph 64 most sensitive.
• Custer and Ogallala least responsive.
• Most varieties responded when soil test was low
  (lt 20 lb/ac 0-24).

11
Wheat response to Chloride at Carrier, OK.
12
Wheat response to Chloride at Hennessey, OK.
13
Wheat response to Chloride at Perkins, OK.
14
Other field observations on Cl.

• No wheat response to K addition as KCl for 30
  years at Lahoma.
• Magruder Plots.

15
OSU Magruder Plots Influence of secondary and
micronutrient input on crop production.
Table 1. Chemical characterization (1992) and
wheat grain yield of Magruder Plots.
Units of measure soil test P and K in lb/acre
by Mehlich-3 yield in bushels/acre, average for
period 1988-1994.