Fertilizer introduction

Fertilizers

1. SAC 301 Manures, Fertilizers and Soil Fertility Management (2+1)
K. Maheshwaran, Asst. Prof. (SS&AC)
Sethu Bhaskara Agricultural College &
Research Foundation
Fertilizer –Definition-
Components and its
classification

2. Soil fertility and soil productivity
“Soilfertilityistheabilityofthesoilto
supplyessentialplantnutrientsduringgrowth
periodoftheplants,withouttoxic
concentrationofanynutrients”.
“the capacity of the soil to supply nutrient in
available form to crop”.

3. Soil fertility and soil productivity
“Soilproductivityistheabilityofthesoilto
produceaparticularcroporsequenceofcrops
underspecifiedmanagementsystem”
All productive soils are fertile but all fertile
soils need not be productive”

4. Fertilizer
•Fertilizerisanymaterialofnaturalorsynthetic
originaddedtothesoiltosupplyoneormore
plantnutrients
•Usuallyfertilizersareinorganicinnatureand
mostofthemareproductsofdifferent
industries.(exceptionsareureaandCaCN
2–
organicfertilizers)

5. Classification of Fertilizers
Fertilizers
Straight
Complex
Mixed

6. Classification of Fertilizers
Straight
fertilizers
•Supply only
one primary
plant nutrient
(N, P & K)
•Urea-N
•SSP
•MOP
Complex
fertilizers
•Contains two
or three
primary plant
nutrients
•Diammonium
phosphate (N,P)
•Mono
ammonium
phosphate
•Ammonium
phosphate
sulphate
Mixed
fertilizers
•Physical
mixtures of
straight
fertilizers
•They contain
two or three
primary plant
nutrients.
•19:19:19 of
NPK

7. Fertilizer
Completefertilizer
•Whichcontainsallthreemajornutrients
(N,P&K)
Incompletefertilizer
•Whichlacksanyoneofthethreemajornutrients
Acid,BaseandNeutralfertilizers
FertilizerGrade
•Refertominimumguaranteeoftheavailableplant
nutrientsexpressedasapercentagebyweightina
fertilizerintermsoftotalN,P
2O
5,K
2O(Complex/
Mixed)12:32:16gradeofNPKcomplexfertilizer

8. Classificationn of Fertilizers

9. Nitrogen fertilizer

10. Fertilizer

11. Phosphatic fertilizers
•Phosphoruspresentinthephosphaticfertilizer
isusuallyexpressedasphosphoruspentoxide
(P
2O
5)
•Phosphorusmovesveryslowlyfromthepoint
ofplacement
Water soluble
Mono-
calcium
phosphate
Citric acid
soluble
Di-calcium
phosphate
Citric acid (or)
water insoluble
Tri-calcium
phosphate

12. Classification of phosphaticfertilizers
Water
soluble
Single Super
Phosphate-16-18%-
Ca(H
2PO
4)
2.H
2O
Double super
phosphate-32%
2Ca(H
2PO
4)
2.H
2O
Triple Super
Phosphate-46-48%
3Ca(H
2PO
4)
2.H
2O
Citric acid
soluble
Di calcium
phosphate-40%
CaHPO
4
Basic slag-13-18%
(CaO)
3P
2O
5SiO
2
Citric acid
insoluble
Rock
phosphate-
20-40%
Bone meal-
20-25%
*Rhenaniaphosphate-26-28 %

13. Potassic fertilizers
S.No Name of fertilizers CompositionK
2O%
1
FertilizerscontainingKinthechloride
formEg.Muriateofpotash
KCl 60
2
FertilizerscontainingKinnonchloride
form
Eg.Potassiumsulphate/Sulphateof
potash
K
2SO
4 48-52
3
Potassiummagnesiumsulphate
K
2SO
4, 2MgSO
4 22
4
Potassiumschoenite
K
2SO
4,
2MgSO
4.6H
2O
22-24