HEADLAND MICRONUTRIENTS

PLANTS CAN ONLY ACCEPT NUTRIENTS IN SOLUTION

DIFFERENT SALTS HAVE VARYING LEVELS OF SOLUBILITY

NITRATES

SULPHATES

HYDROXIDES

OXIDES

CARBONATES

Increasing SolubilityIncreasing Plant Availability

HEADLAND MICRONUTRIENTS

SOLUBILITY OF MAGNESIUM SALTS

Mg(OH)2 0.005 ppm

MgSO4 50 ppm

MgNO3 80 ppm

HEADLAND MICRONUTRIENTS

Trials on Headland Nitrates

CMI 1994 Mg tissue levels after Mg application SAC 1995 Mn tissue levels after Mn application Harper Adams 1995 Mn tissue levels Agronomic Research Mn in Spring Oats 1996 JAR Geelen Research 1996 in Apples Cropcare Mn in Sugar Beet 1997 Levington Mn in Winter Barley 1999

Mn Tissue Levels - Nitrates v Carbonates

0

50

100

150

200

250

Mnppm

pre T1

3 DAT 7 DAT 14DAT

21DAT

28DAT

ppm

Val

ues Headland

JettHeadlandClassicHeadlandChoiceUntreated

Levington Agriculture 1999 on Winter Barley

Pre T1 Mn ppm = 17.3

Significant differences between UT, nitrates and carbonate Mn

ppm Mn DAT

19

45 45

211919

60

51

211919 19

23

17

0

10

20

30

40

50

60

70

ppm 0 DAT ppm 3 DAT ppm 7DAT ppm 14 DAT ppm 21 DAT

ppm

Mn

Manganese 500 g/ha Headland Jett 500 g/ha Untreated

HAC 1995

Winter Barley Trial

Effect of Micronutrient Source on Yield

6.3

6.44

6.77

6 6.2 6.4 6.6 6.8 7

Untreated

500 g MnSulphate

400 g Mn Nitrate

Yield of Winter Barley t/ha

Trial at Harper Adams College, 1995

Effect of Micronutrient Source on Yield

6.3

6.44

6.77

6 6.2 6.4 6.6 6.8 7

Untreated

500 g MnSulphate

400 g Mn Nitrate

Yield of Winter Barley t/ha

Trial at Harper Adams College, 1995

“At 400 g/ha Jett gave significantly greater yield than untreated, whereas Mn Sulphate was not significantly different from untreated”

“Since there were no differences in Mn content between Mn sulphate and Jett it is difficult to explain the better performance of Jett at 400 g/ha”