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Contents
1
Introduction
2
Our performance
3
Prospects and suggestions
Effects of NaCl and manganese in irrigation water on cotton
growth and nutrient-element contents
-
Chen Wen-ling and Jin Meng-gui
China University of Geosciences
Wuhan, Hubei, China
Introduction of brackish water
Introduction of brackish water
• The world water resources distribution
Distinguished by
>50:
brine
0~1:
fresh
water
1~3:
brackish
water
TDS(g/L)
10~50:
saline
water
3~10:
salt
water
Introduction of brackish water
Lacking in fresh water extremely
Lacking in fresh water
Fresh water at normal level
Abundant in fresh water
Introduction of brackish water
• China groundwater quality distribution
wide spread
large storage
nutritious
goodness
and
defects for
irrigation
salt damage
salinization
crop failure
What’s the combined effect of NaCl and manganese on cotton growth?
Fresh water
Brackish water
Salt water
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Our performance
Acupuncture points were used for grow seedlings. One cotton plant
was retained in the sand culture finally.
Materials and Methods
Cotton height was measured from planting to harvest. Plants were
harvested 120days after initiation of the treatments.
Materials and Methods
Materials and Methods
The cotton roots, shoots, leaves and fruits were rinsed with deionized
water, oven dried at 60℃, and weighed to calculate the dry weight.
The dry matters were triturated for acid digestion. Nutrient-element
contents in cotton plant were measured in triplicate by ICP-OES.
Our performance
Our performance
Effects of Different NaCl Concentrations in IW on cotton growth and yields
NaCl promoted the vegetative growth of cotton when the electrical conductivity of
irrigation water was in the range of 2.90 to 6.11 dS m-1, but inhibited vegetative
growth when the EC further increased from 6.11 to 7.17 dS m -1.
Reproductive growth generally increased with the increase of EC in the IW from
2.36 to 7.17 dS m-1.
Effects of Different manganese Concentrations in IW on cotton growth and
yields
Mn concentrations of less than 18 μmol L-1 and higher than 36 μmol L-1 inhibited
cotton growth and yields
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Our performance
Our performance
Combined effect of NaCl and manganese on cotton growth and yields
Combined effect of NaCl and manganese on cotton growth and yields
(1)
(2)
(3)
NaCl
Mn
SF is the synergy factor;
RGOx,y is the observed value for plant growth in a solution with NaCl-concentration x and Mn level y;
RGEx,y is the expected value for plant growth in a solution with NaCl-concentration x and Mn level y;
RGx is the RG for plants grown in a solution with NaCl-concentration x at the lowest concentration of Mn;
RGy is the RG for plants grown in a solution with Mn-concentration y at the lowest concentration of NaCl;
RG is the cotton relative growth;
Gi is the mean growth for a given treatment i and
Gmax is the highest mean growth.
(Levy et al, 1986)
Our performance
Element contents in cotton plants and their effects on growth
An antagonistic relationship for the combined effect of NaCl and Mn
on cotton growth was observed in the experiments.
Our performance
Correlation coefficients between the cotton growth parameters and nutrient
elements in the cotton plants of different irrigation water NaCl concentrations
Parameters
NaCl in IW
Macronutrient elements
Micronutrient elements
Ca
Mg
K
Na
B
Fe
Mn
Cu
Zn
0.87
-0.65
-0.77
-0.67
0.88
-0.88
0.85
0.68
0.81
-0.67
-0.83
-0.84
0.81
0.72
0.84
0.80
-0.90
-0.91
0.76
0.69
0.71
0.66
-0.77
-0.91
-0.90
0.72
-0.73
-0.70
-0.82
0.78
0.73
-0.69
0.85
-0.58
-0.82
-0.70
0.64
0.75
-0.55
0.72
-0.78
-0.65
0.70
-0.55
0.72
-0.66
-0.82
-0.90
0.74
-0.58
0.75
-0.71
-0.59
-0.65
0.79
0.79
-0.75
-0.71
-0.73
0.89
0.77
-0.84
0.84
-0.73
0.77
0.87
0.72
-0.76
0.73
0.70
0.84
0.95
0.79
-0.72
0.82
0.88
0.81
0.93
-0.76
-0.71
-0.68
-0.74
0.76
-0.81
0.74
0.84
0.75
-0.77
0.73
0.71
0.74
-0.70
-0.56
0.58
0.78
0.65
0.72
0.51
0.70
-0.73
0.82
0.94
0.64
0.55
0.70
-0.70
0.63
0.65
-1
Height
Single Boll
DW
Conclusions
1.
The NaCl positively affected the reproductive growth of cotton but reduced its
mmol L
0
5
15
25
35
45
0
5
15
25
35
45
Prospects and suggestions
vegetative growth when the NaCl concentration in the IW increased to 35 mmol
Brackish
water
L-1 (EC of 6.11 dS m-1).
2.
Cotton vegetative and reproductive growth was promoted when the Mn
concentration ranged from 18 to 36 μmol L-1.
3.
The antagonistic characteristics of NaCl and Mn for cotton growth and yields
were observed from the experiments
4.
• Use high TDS water
• Uptake by crops
• Save fresh water
resource
High
salt
sustainable
eco-system
Cotton growth and yields were directly affected by the element contents observed
in cotton plants. NaCl showed different effects on the absorption of nutrient
elements in cotton.
• Performance as nutrient elements
supply
• Cause damage to cotton plant
Trace
element
• Improve the yield
• Nutrient elements
supply
• Enhance salt damage
resistance
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