Seed Germination Rate Calculator

ANA›Life Services Authority›National Calculator Authority›Seed Germination Rate Calculator

.calc-container { max-width: 640px; margin: 2rem 0; padding: 1.5rem; background: #fff; border: 1px solid #ddd; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.06); font-family: system-ui, -apple-system, sans-serif; } .calc-container h3 { font-family: Georgia, serif; font-size: 1.15rem; color: #1a1a1a; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; flex-wrap: wrap; } .calc-row label { min-width: 160px; font-size: 0.9rem; color: #333; font-weight: 500; } .calc-row input[type="number"], .calc-row select { flex: 1; min-width: 120px; max-width: 200px; padding: 0.5rem 0.6rem; border: 1px solid #ccc; border-radius: 4px; font-size: 0.9rem; font-family: system-ui, sans-serif; color: #1a1a1a; background: #fafaf8; } .calc-row input:focus, .calc-row select:focus { outline: none; border-color: var(--ac, #3d5a80); box-shadow: 0 0 0 2px rgba(26,74,138,0.12); } .calc-row .unit { font-size: 0.82rem; color: #888; min-width: 30px; } .calc-btn { display: inline-block; margin-top: 0.5rem; padding: 0.55rem 1.5rem; background: var(--ac, #3d5a80); color: #fff; border: none; border-radius: 4px; font-size: 0.9rem; font-weight: 600; cursor: pointer; font-family: system-ui, sans-serif; } .calc-btn:hover { opacity: 0.9; } .calc-result { margin-top: 1.25rem; padding: 1rem 1.25rem; background: #f0f6fc; border-left: 3px solid var(--ac, #3d5a80); border-radius: 0 6px 6px 0; display: none; } .calc-result.visible { display: block; } .calc-result-label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: #666; margin-bottom: 0.25rem; } .calc-result-value { font-size: 1.6rem; font-weight: 700; color: var(--ac, #3d5a80); } .calc-result-detail { font-size: 0.85rem; color: #555; margin-top: 0.5rem; line-height: 1.5; } .calc-note { margin-top: 1rem; font-size: 0.8rem; color: #888; font-style: italic; } .calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-top: 0.75rem; } .calc-grid-item { padding: 0.6rem 0.8rem; background: #f8f9fa; border-radius: 4px; border: 1px solid #eee; } .calc-grid-item .label { font-size: 0.75rem; color: #888; text-transform: uppercase; letter-spacing: 0.04em; } .calc-grid-item .value { font-size: 1.1rem; font-weight: 600; color: #1a1a1a; } @media (max-width: 720px) { .calc-row { flex-direction: column; align-items: flex-start; gap: 0.3rem; } .calc-row label { min-width: auto; } .calc-row input[type="number"], .calc-row select { max-width: 100%; width: 100%; } .calc-grid { grid-template-columns: 1fr; } } .calc-chart { margin: 1rem 0; text-align: center; } .calc-chart svg { max-width: 100%; height: auto; } .calc-chart-legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.6rem 1.2rem; margin-top: 0.6rem; font-size: 0.8rem; color: #555; } .calc-chart-legend span { display: inline-flex; align-items: center; gap: 0.3rem; } .calc-chart-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; font-style: normal; } .calc-related { max-width: 640px; margin: 2rem 0 1rem; padding: 1.25rem 1.5rem; background: #f8f9fa; border: 1px solid #e8e8e8; border-radius: 8px; } .calc-related h3 { font-family: Georgia, serif; font-size: 1rem; color: #1a1a1a; margin: 0 0 0.75rem; padding-bottom: 0.4rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-related-list { list-style: none; padding: 0; margin: 0 0 0.75rem; display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem 1.5rem; } .calc-related-list li a { font-size: 0.88rem; color: var(--ac, #3d5a80); text-decoration: none; } .calc-related-list li a:hover { text-decoration: underline; } .calc-browse-all { margin: 0.5rem 0 0; font-size: 0.9rem; font-weight: 600; } .calc-browse-all a { color: var(--ac, #3d5a80); text-decoration: none; } .calc-browse-all a:hover { text-decoration: underline; } @media (max-width: 720px) { .calc-related-list { grid-template-columns: 1fr; } }

Seed Germination Rate Calculator

Calculate germination rate (%), mean germination time (MGT), germination energy, and coefficient of velocity for a seed batch.

Total Seeds Planted

Number of Seeds Germinated

Observation Period (days)

Germination Energy Period (days, e.g. first 1/3 of observation)

Seeds Germinated Within Energy Period

Daily Germination Counts (comma-separated, one per day)

Calculate

function seeCalc() { const resultDiv = document.getElementById("see-result");

const total = parseFloat(document.getElementById("see-total").value); const germinated = parseFloat(document.getElementById("see-germinated").value); const days = parseFloat(document.getElementById("see-days").value); const energyDays = parseFloat(document.getElementById("see-energy-days").value); const energyGerm = parseFloat(document.getElementById("see-energy-germ").value); const dailyRaw = document.getElementById("see-daily").value.trim();

// --- Validation --- if (isNaN(total) || total Please enter a valid total number of seeds (≥ 1)."; return; } if (isNaN(germinated) || germinated Please enter a valid number of germinated seeds (≥ 0)."; return; } if (germinated > total) { resultDiv.innerHTML = "Germinated seeds cannot exceed total seeds planted."; return; } if (isNaN(days) || days Please enter a valid observation period (≥ 1 day)."; return; } if (isNaN(energyDays) || energyDays days) { resultDiv.innerHTML = "Germination energy period must be between 1 and the observation period."; return; } if (isNaN(energyGerm) || energyGerm germinated) { resultDiv.innerHTML = "Seeds germinated within energy period must be between 0 and total germinated."; return; }

// --- Parse daily counts --- let dailyCounts = []; let mgt = null; let cv = null; let mgtValid = false;

if (dailyRaw !== "") { dailyCounts = dailyRaw.split(",").map(s => parseFloat(s.trim())); if (dailyCounts.some(isNaN) || dailyCounts.some(v => v Daily germination counts must be non-negative numbers separated by commas."; return; } if (dailyCounts.length !== days) { resultDiv.innerHTML = "Number of daily counts (" + dailyCounts.length + ") must match the observation period (" + days + " days)."; return; } const dailySum = dailyCounts.reduce((a, b) => a + b, 0); if (Math.abs(dailySum - germinated) > 0.5) { resultDiv.innerHTML = "Sum of daily counts (" + dailySum + ") does not match total germinated (" + germinated + ")."; return; }

// Mean Germination Time (MGT) = Σ(ni × ti) / Σni // ni = seeds germinated on day i, ti = day number let sumNiTi = 0; let sumNi = 0; for (let i = 0; i 0) { mgt = sumNiTi / sumNi; // Coefficient of Velocity (CV) = (Σni / Σ(ni × ti)) × 100 cv = (sumNi / sumNiTi) * 100; mgtValid = true; } }

// --- Core Calculations ---

// 1. Germination Rate (GR%) = (germinated / total) × 100 const gr = (germinated / total) * 100;

// 2. Germination Energy (GE%) = (seeds germinated in energy period / total) × 100 const ge = (energyGerm / total) * 100;

// 3. Germination Index (GI) — requires daily counts // GI = Σ(ni / ti) [Czabator 1962] let gi = null; if (mgtValid) { gi = 0; for (let i = 0; i "; const row = (label, value, unit, note) => "" + "" + label + "" + "" + value + " " + unit + "" + "" + (note || "") + "" + "";

html += row("Total Seeds Planted", total.toFixed(0), "", ""); html += row("Seeds Germinated", germinated.toFixed(0), "", ""); html += row("Seeds Not Germinated", nonGerminated.toFixed(0), "", nonGerminatedPct.toFixed(1) + "% of total"); html += row("Germination Rate (GR)", gr.toFixed(2), "%", gr >= 80 ? "✅ Excellent" : gr >= 60 ? "⚠️ Acceptable" : "❌ Poor"); html += row("Germination Energy (GE)", ge.toFixed(2), "%", "First " + energyDays + " day(s)");

if (mgtValid) { html += row("Mean Germination Time (MGT)", mgt.toFixed(2), "days","Lower = faster germination"); html += row("Coefficient of Velocity (CV)", cv.toFixed(2), "%", "Higher = faster germination"); html += row("Germination Index (GI)", gi.toFixed(4), "", "Czabator 1962; higher = better"); } else { html += "Enter daily germination counts to calculate MGT, CV, and GI."; }

html += "";

// Interpretation banner html += "= 80 ? "#e6f9ee" : gr >= 60 ? "#fff8e1" : "#fdecea") + ";'>" + "Interpretation: " + (gr >= 80 ? "Germination rate is excellent (≥ 80%). Seed lot is high quality." : gr >= 60 ? "Germination rate is acceptable (60–79%). Consider improving storage or pre-treatment." : "Germination rate is poor (";

resultDiv.innerHTML = html; }

#### Formulas Used

Germination Rate (GR%) GR = (Ngerminated / Ntotal) × 100

Germination Energy (GE%) GE = (Ngerminated in energy period / Ntotal) × 100

Mean Germination Time (MGT) — requires daily counts MGT = Σ(ni × ti) / Σni where ni = seeds germinated on day i, ti = day number

Coefficient of Velocity (CV%) CV = (Σni / Σ(ni × ti)) × 100

Germination Index (GI) — Czabator (1962) GI = Σ(ni / ti)

#### Assumptions & References

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References

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