R. Scott Johnson UC Extension Pomologist · Microsoft PowerPoint - Johnson, Scott.ppt...
Transcript of R. Scott Johnson UC Extension Pomologist · Microsoft PowerPoint - Johnson, Scott.ppt...
Zinc Foliar Uptake EfficiencyZinc Foliar Uptake EfficiencyR. Scott Johnson
UC Extension Pomologistg
Reported Zn Uptake EfficienciesReported Zn Uptake Efficiencies
6 % Pi hi2.1 to 6.5% Pistachios3.5% Walnuts3 56.0% Beans0 2% Pecans0.2% Pecans<1.0% Citrus0.2 to 14.5% Peaches
F t Aff ti Zi F li U t kFactors Affecting Zinc Foliar Uptake
Pl S iPlant SpeciesZn FormulationZn Concentration in SolutionLength of Time for Uptakeg pZn Status of the PlantLeaf AgeLeaf AgeAdditives – Surfactants, Urea etc.
Zi M t i lZinc Materials
Basic Chemicals Zn sulfate
Chelates & Complexes EDTA
Zn oxide Zn carbonate
EDTA Lignosulfonate Amino acidZn carbonate
Zn chloride Zn oxysulfate
Amino acid Sugar Citric acid Zn oxysulfate
Zn nitrate Citric acid Fulvic acid, humic acid
Leaf Area of Individual Leaves
12.02) C t l
3.0
6.0
9.0
Leaf
Are
a (c
m ControlSulfateNitrateCarbohyOxide
0.0-10 0 10 20
Node from Time of Treatment
L
Comparing Zinc Formulations
Ranking Formulation Anion SizeSolubility(g/100 H2O) Phytotoxicity
Most Effective Zinc Chloride 35 432 High (58*)Most Effective Zinc Chloride 35 432 High (58*)
Almost As GoodZinc Nitrate 62 324 High (54)Zinc Nitrate Mix 62 & 96 324 High (59)
Next Best
Zinc Sulfate 96 50 Moderate (12)Zinc Carbohydrate 96 & ? High Moderate
&Zinc Polyamine 96 & 75-204 High ModerateZinc Glycine 96 & 75 Moderate (15)
Zinc EDTA 292 High LowLess Effective
Zinc EDTA 292 High LowZinc Leonardite 1000+ High LowZinc Oxysulfate 16 & 96 1.3 None
Least EffectiveZinc Phosphite 79 ? Low (17)Zinc Oxide
Suspension16 Insoluble None
F t Aff ti Zi F li U t kFactors Affecting Zinc Foliar Uptake
Pl S iPlant SpeciesZn FormulationZn Concentration in SolutionLength of Time for Uptakeg pZn Status of the PlantLeaf AgeLeaf AgeAdditives – Surfactants, Urea etc.
Peach Seedlings - 68ZnSO4 Rate68Zn Taken Up by Plant as % of Applied
Peach Seedlings - 68ZnSO4 Rate68Zn Taken Up by Plant as % of Applieda e Up by a t as % o pp eda e Up by a t as % o pp ed
3
2
3
b b
a
%Uptake
%Uptake
1
2 b bb
0
1
d
c
UTC 100 200 400 1000 5000
Treatment - ppm ZincTreatment - ppm Zinc
Peach Seedlings - 68ZnSO4 Rate68Zn in Untreated Plant Organs
Peach Seedlings - 68ZnSO4 Rate68Zn in Untreated Plant OrgansU t eated a t O ga sU t eated a t O ga s
4 a
68Zn68Zn 3
4
b
From Fertilizer
(mg)
From Fertilizer
(mg)2 c
0
1e
ded
Treatment - ppm ZincTreatment - ppm Zinc
UTC 100 200 400 1000 5000
F t Aff ti Zi F li U t kFactors Affecting Zinc Foliar Uptake
Pl S iPlant SpeciesZn FormulationZn Concentration in SolutionLength of Time for Uptakeg pZn Status of the PlantLeaf AgeLeaf AgeAdditives – Surfactants, Urea etc.
Recovery of Labelled 68Zn Sulfate Applied toRecovery of Labelled 68Zn Sulfate Applied toy ppLeaves of One-Year-Old Peach Trees in the Fall
y ppLeaves of One-Year-Old Peach Trees in the Fall
44
55DormantDormant One month after BloomOne month after Bloom
33
44% of
Label Z
% of
Label Z
11
22Zn
AppliedZn
Applied
00RootsRoots TrunkTrunk ShootsShoots NewNew
GrowthGrowthRootsRoots TrunkTrunk ShootsShoots
GrowthGrowth
F t Aff ti Zi F li U t kFactors Affecting Zinc Foliar Uptake
Pl S iPlant SpeciesZn FormulationZn Concentration in SolutionLength of Time for Uptakeg pZn Status of the PlantLeaf AgeLeaf AgeAdditives – Surfactants, Urea etc.
18
Zinc Status Experiment
14
16
18HiControl
Hi+Sulfate
10
12
ea (c
m2)
LoControl
L +S lf t
4
6
8
Leaf
Are Lo+Sulfate
0
2
4
10 0 10 20 30-10 0 10 20 30Node From Time of Foliar Treatment
Zinc Status Experiment
High Zinc 6 0% Uptake of Foliar 68ZnHigh Zinc – 6.0% Uptake of Foliar 68Zn
Low Zinc – 7.2% Uptake of Foliar 68Zn
F t Aff ti Zi F li U t kFactors Affecting Zinc Foliar Uptake
Pl S iPlant SpeciesZn FormulationZn Concentration in SolutionLength of Time for Uptakeg pZn Status of the PlantLeaf AgeLeaf AgeAdditives – Surfactants, Urea etc.
Zinc Uptake and Leaf Age(From work of Patrick Brown)(From work of Patrick Brown)
PistachioYoung Leaves – 6.5% Zn UptakeM t L 2 1% Z U t kMature Leaves – 2.1% Zn Uptake
WalnutNo Difference
F t Aff ti Zi F li U t kFactors Affecting Zinc Foliar Uptake
Pl S iPlant SpeciesZn FormulationZn Concentration in SolutionLength of Time for Uptakeg pZn Status of the PlantLeaf AgeLeaf AgeAdditives – Surfactants, Urea etc.
Surfactants Added to 68Zn Sulfate
68Z
3
ab
aab
b bab
68Zn Uptake
(% of applied)2
b b
1
c
ControlNone
L77( 20)L77(.05)
SilSKinetic
Super 7
0c
Control L77(.20) SilSuper Super 7
F t Aff ti Zi F li U t kFactors Affecting Zinc Foliar Uptake
Pl S iPlant SpeciesZn FormulationZn Concentration in SolutionLength of Time for Uptakeg pZn Status of the PlantLeaf AgeLeaf AgeAdditives – Surfactants, Urea etc.
Zinc FertilizationZinc Fertilization
A l if t Apply if symptoms appear or leaf Zn < 10 to 12 ppm or Sept shoot Zn < 20 ppmSept shoot Zn < 20 ppm
If needed in mature trees – If needed in mature trees –spray 4 to 8 lbs/acre of zinc sulfate (36% Zn) in early fall (3 ) y– can be applied with urea
http://ucanr.org/sites/fruitreport/p g p