Intro to Soil Fertility and Plant Nutrition
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Transcript of Intro to Soil Fertility and Plant Nutrition
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8/8/2019 Intro to Soil Fertility and Plant Nutrition
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Soil Fertility and Plant Nutrition
y oes ma er
LightCO2
Heat
a er u r en s
Ca acit of a soil to su ort roduction of aspecific crop.
Measured in terms of yield/biomass
Productivity depends on adequate moisture,
climate (temperature, rainfall).
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Soils ca acit to su l elements essential forplant growth
Measured: - directly (concentration of nutrients)
- indirectly (productive capacity)
Soil fertility is relative to the plant being
Civilization depends on agriculture
A riculture de ends on soil roductivit
fertility
World Population Growth
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Food Production and Nourishment
US agricultural productivity
ren s n arm an s
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World Fertilizer Consumption
80
100
ns
60nTo Nitrogen
P2O5
20Milli K2O
NO3-
0
1920 1940 1960 1980 2000 2020
Location of North American phosphate
SKMB
BCAB
ND
ON
WA
OR
MT
MN
PQ
NB
NS
PEI
ME
VT
ID
SD
NY
PA
OHINIL
IA
WIMI
WY
NV
NH
MA
CTRI
NE
MD
NJ
UT
CA
AZ M
KS
MO
KY
WVVA
MD
DE
NC
TNOK
CO
AR
TX LA
MS AL GA
SC
Potash mines
Phosphate rock mines
FL
Total Reserves: 13,224 million tons
Life of Reserves: 88 years
US Reserves: 1,102 million tons
Life of US Reserves: 25 years
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Total Reserves: 9,256 million tons
Factors Affecting Plant Growth
and Yield
Climate: rain, temperature, light, wind, etc.
Crop: variety, planting date, pests, etc.
Soil: fertilit , structure, texture, etc.
Textbook Table 1-6
be no greater than that allowed by
e mos m ng grow ac or
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e g s na ogy o a arre
Seeding rate
P and seeding rate
Water, P and seeding rate
N
Seeding rate
P and seeding rate
Water, P and seeding rate
N
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Seeding rate
P and seeding rate
Water, P and seeding rate
N
Seeding rate
P and seeding rate
Water, P and seeding rate
NN
Essential Plant Nutrients
Classification: Quantitative Abundance
Carbon
H dro en
Iron
Zinc
Oxygen Nitrogen
Boron Molybdenum
Phosphorous
Potassium
Copper
Manganese
Calcium
Sulfur
Chloride
Nickel
agnes um
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Classification of Nutrients based on
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Classification of Nutrients: Function
Classification of Nutrients: Function
Classification of Nutrients: Mobility
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S deficiency
N deficienc
r ca ange
Steenberg effect
World Fertilizer Consumption
80
100
ns
60
onT
oNitrogenP2O5
20Milli K2O
NO3-
0
1920 1940 1960 1980 2000 2020
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EUTROPHICATIONNatural Process Accelerated by land use
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Extent of H oxia in the Gulf of Mexico
Frequency of Occurrence 1985 - 1999
Distribution of frequency of occurrence of midsummer hypoxia
based on data from Rabalais, Turner and Wiseman
-,
page 14-27