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    Fertilizer Computation: by Prof. Oscar M. Mojica

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    al-clark espinosa
    This document discusses the computation of fertilizer recommendations. It defines key terms like nutrient elements, fertilizer grade, and fertilizer materials. It provides fertilizer recommendations for different crops. It also gives examples of fertilizer materials and their grades. The document shows formulas for determining nutrient contents in fertilizers and fertilizer needs based on recommendations. It provides sample problems demonstrating how to calculate these values. It discusses mixtures of fertilizers and gives an example problem comparing costs of single, double, and complete element mixtures.

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    Fertilizer Computation: by Prof. Oscar M. Mojica

    Uploaded by

    al-clark espinosa
    426 views27 pages
    This document discusses the computation of fertilizer recommendations. It defines key terms like nutrient elements, fertilizer grade, and fertilizer materials. It provides fertilizer recommendations for different crops. It also gives examples of fertilizer materials and their grades. The document shows formulas for determining nutrient contents in fertilizers and fertilizer needs based on recommendations. It provides sample problems demonstrating how to calculate these values. It discusses mixtures of fertilizers and gives an example problem comparing costs of single, double, and complete element mixtures.

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    This document discusses the computation of fertilizer recommendations. It defines key terms like nutrient elements, fertilizer grade, and fertilizer materials. It provides fertilizer recommendations for different crops. It also gives examples of fertilizer materials and their grades. The document shows formulas for determining nutrient contents in fertilizers and fertilizer needs based on recommendations. It provides sample problems demonstrating how to calculate these values. It discusses mixtures of fertilizers and gives an example problem comparing costs of single, double, and complete element mixtures.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    426 views27 pages

    Fertilizer Computation: by Prof. Oscar M. Mojica

    Uploaded by

    al-clark espinosa
    This document discusses the computation of fertilizer recommendations. It defines key terms like nutrient elements, fertilizer grade, and fertilizer materials. It provides fertilizer recommendations for different crops. It also gives examples of fertilizer materials and their grades. The document shows formulas for determining nutrient contents in fertilizers and fertilizer needs based on recommendations. It provides sample problems demonstrating how to calculate these values. It discusses mixtures of fertilizers and gives an example problem comparing costs of single, double, and complete element mixtures.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 27

    Fertilizer

    Computation

    by Prof. Oscar M.
    Mojica
    • Nutrient Element (NE) - elements found in
    fertilizer and soil that are essentially needed
    by plants.

    • Fertilizer Grade (FG)- guaranteed nutrients


    content in the fertilizer materials in
    percentage (%).

    • Fertilizer Material (FM)- any materials that


    carry or contain of nutrient element/s.
    • Fertilizer Recommendation (FR) - amount of nutrients needed
    by plant in one growing period, or for long term crop, one
    growing year in terms of kilogram per heactare. N-P₂O₅-K₂O
    kg per hectare

    • Different crop has different FR.

    • Rice : 90-30-30 dry season


    • 60-50-50 wet season
    • Corn : 120-80-80
    • Durian 60-30-30 0-2 years
    • 80-60-50 3-4 years
    • 120-90-90 4-6 years
    • 140-120-120 6 years to .....
    Example of Fertilizer Materials
    • A. INORGANIC FERTILIZER
    • Single Element Fertilizer - contains only one of the major nutrients (NPK)
    • examples: Urea: 45-0-0
    • Ammonium sulfate (Amosul): 21-0-0
    • Ordinary superphosphate OSP: 0-18-0
    • Superphosphate : 0-20-0
    • Muriate of Potash (MP) : 0-0-60

    • Double Element Fertilizer - contain at least two of the three major nutrients
    elements.
    • example: Ammonium phosphate (Amophos): 16-20-0

    • Complete Element Fertilizer - contains the three major nutrients elements needed by
    plants.
    • 1. 14-14-14
    • 2. 12-24-12
    • 3. 24-32-24
    • Note: all liquid and organic fertilizers are complete fertilizer differ in fertilizer grade.
    • B. ORGANIC FERTILIZER - comes or originate from organic matter
    (plant and animals) through the prescribed decomposition
    process.
    • Examples:
    • Animal manure comes from dungs of animals.
    • Green manure comes from the tissues of
    • legumes crops.
    • Guano manure comes from manure of bats.
    • Vermicast remains of earthworms.
    • Night Soil comes the dungs of human being.

    • Commercially manufacture organic fertilizer, like Sagana 100,


    Coco Plus, Bio Plus, and many others are also organic fertilizer.

    • All organic fertilizer are complete fertilizer but at minimal


    fertilizer grade. It is dependent of raw materials used.
    Fertilizer Computation
    Formula to be used:
    A- Determination of Nutrient Element/s Contents of Fertilizer Materials:

    Nutrient Element (NE) = Fertilizer Materials


    (FM) times Fertilizer Grade (FG).
    NE = FM X FG

    Sample Problem 1:
    How many kilograms of Nitrogen in 50 kg (1 bag) of
    Urea (45% N) ?

    Using the formula:

    NE = 50 kg X 0.45 NE = 22.5 kg of N
    • Sample Problem 2:
    • A 250 kg of OSP (0-18-0) was applied to a certain
    area, how many kilograms of P₂O₅?
    • Using the formula:
    • P₂O₅ (NE) = 250 kg X 0.18
    • (NE) = 45 kg of P₂O₅.

    • Sample Problem 3:
    • A 25 kg of Muriate of Potash (0-0-60 was applied to
    garden of eden, how many kilograms of K₂O?
    • Using the formula:
    • K₂O (NE) = 25 kg X 0.60
    • K₂O (NE) = 15 kg of K₂O.
    • B - Determination of Fertilizer Materials
    • Fertilizer Recommendation (FR)
    • Fertilizer Materials (FM) =
    • Fertilizer Grade (FG)
    • Sample Problem 4:
    • How kg of Urea needed to satisfy the 60 kg N Fertilizer requirement of Corn?
    • Using the formula:
    • 60 kg N
    • Urea (FM) =
    • 45%
    • = 133.333 kg of Urea

    • Sample Problem 5 :
    • A 75 kg of K₂O was the needed nutrients by Coconut, how many kilograms of MP
    will be applied?
    • 75 kg K₂O
    • Using the formula:
    • 60%
    • Muriate of Potash (FM) = 125 kg of MP
    • B - Determination of Fertilizer Materials
    • Fertilizer Recommendation (FR)
    • Fertilizer Materials (FM) =
    • Fertilizer Grade (FG)
    • Sample Problem 6:
    • How kg of OSP needed to satisfy the 90 kg P₂O₅ Fertilizer
    requirement of Corn?
    • Using the formula:
    • 90 kg P₂O₅
    • OSP (FM) =
    • 18%
    • = 500 kg of OSP
    Computation of Fertilizer Mixture
    • Three Fertilizer Mixtures
    • 1. Single Element Fertilizer Mixture – all fertilizer materials
    used contain one nutrient element.
    • 2. Double Element Fertilizer Mixture – this contain one
    double element fertilizer and two single element fertilizer
    materials.
    • 3. Complete Element Fertilizer Mixture – this contain one
    complete element fertilizer and with one or two single
    element fertilizer materials.

    • This is a computation of Fertilizer Mixture based on the


    Fertilizer Requirement needed by Crop.
    • In addition,
    • cost of fertilizer is also considered.
    Sample Problem on Fertilizer Mixture
    One hectare Durian Plantation planted at a distance of 5 X 8
    meter apart
    and has a Fertilizer Requirement of 120-90-80.
    Available fertilizer materials in the market are the following:
    1. Urea (45% N)- 1,200.00 per bag
    2. OSP (0-18-0) - 950.00 per bag
    3. MP (0-0-60) - 1,000.00 per bag
    4. Complete (14-14-14) – 1,400.00 per bag
    5. Amophos (16-20-0) - 1,100.00.
    Which among the fertilizer mixture is the Cheapest to used
    using the above fertilizer materials?
    In the Cheapest Fertilizer Mixture,
    how many kilograms of each Fertilizer Materials used to be
    applied per tree of Durian Tree?
    Steps in Computation
    • 1. Determine the population of the Durian Tree in one
    Hectare.
    • 2. First, compute the single element fertilizer mixture and
    determine the cost.
    • 3. Second, compute the double element fertilizer mixture
    and determine the cost.
    • 4. Third, compute the complete element fertilizer mixture
    and determine the cost.
    • 5. Identify the fertilizer material of the cheapest fertilizer
    mixture and determine the amount of each.
    • 6. Divide the amount of each fertilizer materials in the
    cheapest mixture by the number of plants in the plantation.
    Determination of Plant Population or Density

    • Using Square Method:


    • Area (sq m)
    • No. of Plts =
    • Distance of Planting
    • 10,000 m²
    • No. of Plts =
    • 5m X 8m
    • 10,000 m²
    • No. of Plts =
    • 40 m²

    • No. of Plts = 250 plts


    Single Element Fertilizer Mixture
    N-Urea = 120/45% = 266.667 kg of Urea /50 =
    5.3 bag X 1,200.00 = 6,360.00

    P-OSP = 90/18% = 500 kg of OSP /50 =


    10 bags X 950.00 = 9,500.00

    K-MP = 80/60% = 133.333 kg of MP / 50 =


    2.7 bags X 1,000.00 = 2,700.00
    Total Cost of Single Element
    Fertilizer Mixture = 18,560.00
    Double Element FertilizerMixture
    90
    P-AP = = 450 kg of AP / 50 = 9 bags X 950.00 = 8,550.00
    20% 450 X .16 = 72
    120 – 72 48
    N-Urea = = = 106.667 kg of Urea / 50 =
    45% 0.45
    2.1 X 1,200.00 = 2,520.00

    K-MP = 80/60% = 133.333 kg of MP / 50 =


    2.7 bags X 1,000.00 = 2,700.00
    Total Cost of Double Element
    Fertilizer Mixture = 13,770.00
    Complete Element Fertilizer Mixture
    80
    K-Com = = 571.429 kg of com / 50= 11.4 bags of MP X 1,400.00 = 15,960.00
    14%
    120 – 80 40
    N-Urea = = = 88.889 kg of Urea / 50 =
    45% .45
    1.8 X 1,200.00 = 2,160.00
    120 – 80 40
    P-OSP = = = 222.222 kg of OSP / 50 =
    18% 0.18
    4.4 X 950.00 = 4,180.00
    Total Cost of Complete Element
    Fertilizer Mixture = 22,300.00
    Comparison among the 3 Fertilizer Mixtures

    Total Cost of Single Element


    Fertilizer Mixture = 18,560.00
    Total Cost of Double Element
    Fertilizer Mixture = 13,770.00

    Total Cost of Complete Element


    Fertilizer Mixture = 22,300.00

    • Double Element Fertilizer Mixture is the Cheapest to


    Used.
    Determination of Fertilizer Material of Cheapest
    per tree to be applied
    P-AmoPhos = 450 kg of AP / 250
    = 1.8 kg of Amophos per tree

    N-Urea = 106.667 kg of Urea / 250


    = 0.426 or 0.427 kg o Urea per tree

    K-Muriate of Potash = 133.333 kg of MP / 250


    = 0.533 kg per of MP per tree
    Computation based on Soil Analysis
    Result of Soil There are 2,000,000 kg of soil in one
    Analysis: furrow slice of One hectare soil.
    2 ppm of N
    2 ppm X 2 = 4 kg N
    6 ppm of P₂O₅
    6 ppm X 2 = 12 kg P₂O₅
    8 ppm of K₂O 8 PPm X 2 = 16 kg K₂O

    FR : 120 – 90 – 80
    FR : 120 – 90 – 80 4 12 16
    116 78 64
    4 12 16
    116 78 64
    Double Element Fertilizer Mixture after Soil
    Analysis
    FR : 116 78 64
    78
    P-AP = = 390 kg of AP / 50 = 7.8 bags X 950.00 = 7,410.00
    20% 390 X .16 = 62.40
    116-62.4 53.6
    N-Urea = = = 119.111 kg of Urea / 50 =
    45% 0.45
    2.4 X 1,200.00 = 2,880.00

    K-MP = 64/60% = 106.667 kg of MP / 50 =


    2.1 bags X 1,000.00 = 2,100.00
    Total Cost of Double Element
    Fertilizer Mixture = 12,390.00
    Computation based on Soil Analysis and in Combination
    Inorganic and 500 kg Organic Fertilizer
    Organic Amount of Amount of FR : 116 – 78 – 64
    fertilizer Organic Nutrient 40 20 15
    Grade : Fert Applied Applied
    8% N 500 kg 40 kg N 76 58 49
    4% P₂O₅ 500 kg 20 kg P₂O₅
    3 % K2O 500 kg 15 kg K2O
    to be supplied by
    FR 76 58 49
    Inorganic Fertilizer
    Computation of fertilizer
    following the same
    procedure.
    Computation based on Soil Analysis and in Combination
    Inorganic and 500 kg (10 bgs) Organic Fertilizer
    FR = 76 58 49
    58
    P-AP = = 290 kg of AP / 50 = 5.8 bags X 950.00 = 5,510.00
    20% 290 X .16 = 46.4

    76 – 46.4
    29.6
    N-Urea = = = 65.778 kg of Urea / 50 =
    45% 0.45
    1.3 bag X 1,200.00 = 1,560.00
    K-MP = 49/60% = 81.667 kg of MP / 50 =
    1.6 bags X 1,000.00 = 1,600.00

    Cost of Organic fertilizer (10 X 300 ) = 3,000.00

    Computation based on Soil Analysis and in


    Combination Inorganic and 500 kg (10 bgs)
    Organic Fertilizer = 11,670.00
    Computation using Organic Fertilizer alone
    after Soil Test
    FR : 116 – 78 – 64
    Organic fertilizer Grade :
    8% N ; 4% P₂O₅ ; 3 % K₂O
    64
    K -Organic = = 2,133.333 kg of Organic Fertilizer
    . 0.03%

    2,133.333 kg of Organic Fertilizer / 50 = 42.7 bags


    Computation using Organic Fertilizer alone
    after Soil Test
    2,133.333 kg of Organic Fertilizer / 50 = 42.7 bags

    Cost of Org Fert. = 42.7 bags X 300.00


    = 12,810.00
    P₂O₅ = 2,133.333 X .04 = 85.333 kg P₂O₅

    N = 2,133.333 X .08 = 170. kg N

    Applied per plant = 2,133.333 / 250 = 8.533 kg per plt


    of Org fert
    Comparison of different fertilizer mixture
    Total Cost of Double Element
    Fertilizer Mixture = 13,770.00

    Computation based on Soil


    Analysis and in Combination
    Inorganic and 500 kg (10 bgs)
    Organic Fertilizer = 11,670.00

    Computation using Organic


    Fertilizer alone after Soil Test = 12,365.00
    Happy
    Computing of
    Fertilizer
    Problems

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