AEPS 315: Principles Of Plant Nutrition, Soil Mana
AEPS 315: Principles of Plant nutrition, Soil Mana
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AEPS 315: Principles of Plant nutrition, Soil Management
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AEPS 315: Principles of Plant nutrition, Soil Mana
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AEPS 315: Principles Of Plant Nutrition, Soil Mana
AEPS 315: Principles of Plant nutrition, Soil Management
macronutrients (6) ️N
K
Ca
P
Mg
S
Micronutrients (9) ️Fe
Mn
Cl
B
Cu
Zn
Mo
Ni
Na?
role of nitrogen ️Amino acids, protein synthesis, nucleic acids
role of Potassium (7) ️Enzyme activation, winter hardin...
AEPS 315: Principles of Plant nutrition, Soil Management
macronutrients (6) ✔️N
K
Ca
P
Mg
S
Micronutrients (9) ✔️Fe
Mn
Cl
B
Cu
Zn
Mo
Ni
Na?
role of nitrogen ✔️Amino acids, protein synthesis, nucleic acids
role of Potassium (7) ✔️Enzyme activation, winter hardiness, water relations, N uptake and protein
synthesis, disease resistance,
translocation, starch synthesis
Role of Calcium ✔️membrane function, cell regulation
Role of Phosphorus ✔️ATP, used early in life cycle, root formation, nucleic acids
,Role of magnesium ✔️Chlorophyll, co-factor in ATP metabolism
role of sulfur ✔️amino acids
role of Fe ✔️Chlorophyll, cytochromes, enzymes
role of Mn ✔️Formation of amino acids, chloroplast membrane, enzyme systems
role of cl ✔️Photosynthetic phosphorylation, charge balance, osmotic pressure
role of B ✔️Synthesis of amino acids and proteins, nodule formation
role of Cu ✔️Nitrate reduction, photosynthetic electron transfer
role of Zn ✔️Enzymatic activities
role of Mo ✔️Nitrate reductase, N fixation
role of Ni ✔️Part of urease (needed in N fixation)
role of Na ✔️Photosynthesis in C4 and CAM plants.
-Substitutes for K
-Beneficial: Si, Se, Co
Liebig's Law of the Minimum ✔️Justus von Liebig's famous "Law of the Minimum" principle implies that
crop yield is proportional to the amount of the most limiting essential nutrient, whichever nutrient that
may be.
Natural nitrate of soda (Chilean nitrate) (NNS): NaNO3 ✔️-15-0-2 or 16-0-0 (soluble N)
-Mined product from a desert in Northern Chile
-The NOSB recommended that NOP implement a rule change prohibiting NNS on certified organic farms
(was scheduled to take effect in October, 2012), but NOP never prohibited it
-Restriction: "Pending additional rule-making, operators using chilean (sodium) nitrate shall use it in a
manner that maintains or improves the natural resources of the operation, ..."
practical aspects of NNS ✔️- 24% Na: undesirable in arid and semiarid regions.
- Na, in small quantities, does not cause damage to the soil ecosystem.
-Applying NNS along with an organic amendment (e.g., cocoa meal, peanut meal or compost) will
increase the efficiency of both products.
-NNS should not be relied upon as a sole source of N
plant sources ✔️- N fixation
- Crop residues
- Plants high in protein great sources for N (protein / 6.25 = total N)
Plant fertilizer examples: ✔️-Peanut meal
-Alfalfa meal
-Soybean meal
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