Calculator

Category: Crop Establishment and Plant Population

  • Germination Percentage calculator

    Germination Percentage Calculator

    Germination Percentage (GP)

    Enter seed test counts

    Formula:

    Germination Percentage
    GP (%) = (Normal seedlings / Total seeds) × 100

    Where:
    Normal seedlings = seedlings meeting normal criteria
    Total seeds = total seeds tested

  • Seed Rate Calculator

    Seed Rate Calculator

    Seed Rate

    Enter desired population, germination and purity

    Formula:

    Seed Rate
    Seed rate = Desired plant population / (Germination × Purity)

    Note:
    Germination and purity are expressed as proportions (÷100)

  • Plant Population Calculator

    Plant Population Calculator

    (For Plant Breeding & Field Experiments)

    Formula Used:

    Area per Plant (m²) = Row Spacing × Plant Spacing
    Plant Population (plants/ha) = 10,000 ÷ Area per Plant
    Plants per Plot = Plot Area ÷ Area per Plant

    Results:

    Plant Population (plants/ha): —

    Plants per Plot: —

  • Row–Plant Spacing Calculator

    Row–Plant Spacing Calculator

    (For Plant Breeding & Field Experiments)

    Formula Used:

    Area per Plant (m²) = 10,000 ÷ Desired Plant Population
    Plant Spacing (m) = Area per Plant ÷ Row Spacing

    Result:

    Plant-to-Plant Spacing: —

  • Field Emergence Calculator

    What is Field Emergence?

    Field emergence is the percentage of seeds that successfully emerge as seedlings under actual field conditions. It reflects seed quality, sowing depth, soil moisture, temperature, and field management.

    Formula Used

    Field Emergence (%) =
    (Number of seedlings emerged ÷ Number of seeds sown) × 100

    Enter Field Data

    Interpretation Guide:
    • ≥ 85% → Excellent crop establishment
    • 70–84% → Acceptable, but may need improvement
    • < 70% → Poor emergence (check seed, moisture, depth, pests)

  • Missing Hill Percentage

    🌾 Missing Hill Percentage Calculator

    What is Missing Hill Percentage?

    Missing hill percentage represents the proportion of planting positions (hills) where no plant emerged. It indicates poor establishment due to seed failure, pests, improper depth, or soil moisture stress.

    Formula Used

    Missing Hill (%) =
    (Number of missing hills ÷ Total number of hills) × 100

    Enter Field Observations

    Interpretation Guide:
    • < 5% → Excellent stand establishment
    • 5–10% → Acceptable (gap filling optional)
    • > 10% → Poor stand (gap filling required)

  • Gap filling requirement calculator

    🌾 Gap Filling Requirement Calculator

    What is Gap Filling?

    Gap filling is the practice of replanting seedlings or seeds in places where original hills failed to establish. It ensures optimum plant population and uniform crop growth.

    Formula Used

    Gap Filling Required (No. of hills) =
    Total number of missing hills
    Extra Seedlings Needed =
    Missing hills × Plants per hill

    Enter Field Data

    Field Guideline:
    • Gap filling should be done within 7–10 days after sowing/transplanting
    • Use healthy seedlings of same age
    • Avoid late gap filling (causes uneven maturity)

  • Transplanting Density Calculator

    🌾 Transplanting Density Calculator

    What is Transplanting Density?

    Transplanting density refers to the number of hills or plants established per unit area after transplanting. Proper density ensures optimum use of light, nutrients, and space.

    Formula Used

    Hills per hectare =
    10,000 ÷ (Row spacing × Plant spacing)
    Plant population per hectare =
    Hills per hectare × Seedlings per hill

    Enter Spacing Details

    Field Tips:
    • Rice: usually 1–2 seedlings per hill
    • Wider spacing reduces competition but increases tillering
    • Overcrowding reduces yield and increases lodging

  • Nursery Area Requirement Calculator

    🌱 Nursery Area Requirement Calculator

    What is Nursery Area?

    Nursery area is the land required to raise seedlings before transplanting them into the main field. Proper nursery planning ensures healthy seedlings and uniform crop stand.

    Formula Used

    Hills per hectare =
    10,000 ÷ (Row spacing × Plant spacing)
    Total seedlings required =
    Hills × Seedlings per hill
    Nursery area (m²) =
    Total seedlings ÷ Seedlings per m² (nursery density)

    Enter Crop Details

    Standard Nursery Density:
    • Rice: 800–1000 seedlings/m²
    • Vegetables: 400–600 seedlings/m²
    • Tobacco: 1200–1500 seedlings/m²