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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>Fertilizer Calculator</title>
<!-- Example using Google Fonts -->
<link rel="preconnect" href="https://fonts.googleapis.com" />
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
<link
href="https://fonts.googleapis.com/css2?family=Open+Sans:wght@400;600&display=swap"
rel="stylesheet"
/>
<style>
/* Base styling */
* {
box-sizing: border-box;
margin: 0;
padding: 0;
font-family: 'Open Sans', sans-serif;
}
body {
background: linear-gradient(to top right, #e0f7fa 0%, #e1f5fe 100%);
color: #333;
padding: 2rem;
}
h1, h2, h3 {
margin-bottom: 0.5rem;
}
h1 {
font-weight: 600;
text-align: center;
margin-bottom: 1.5rem;
}
/* Container */
.container {
max-width: 900px;
margin: 0 auto;
background: #fff;
border-radius: 8px;
box-shadow: 0 4px 12px rgba(0,0,0,0.15);
padding: 2rem;
}
/* Section title */
.section-title {
margin-top: 2rem;
margin-bottom: 1rem;
font-size: 1.1rem;
font-weight: 600;
color: #444;
border-bottom: 2px solid #ddd;
padding-bottom: 0.5rem;
}
/* Form styling */
form {
display: flex;
flex-direction: column;
}
.form-group {
margin-bottom: 1rem;
}
.label-row {
display: flex;
flex-wrap: wrap;
justify-content: space-between;
align-items: baseline;
margin-bottom: 0.3rem;
}
.label-row label {
font-weight: 600;
margin-right: 0.5rem;
}
.label-row .param-note {
font-size: 0.85rem;
color: #777;
flex: 1 0 auto;
margin-left: 0.5rem;
}
input[type="number"] {
width: 100%;
max-width: 300px;
padding: 0.5rem;
border: 1px solid #ccc;
border-radius: 4px;
font-size: 1rem;
}
input[type="number"]:focus {
outline: none;
border-color: #007BFF;
}
.description {
font-size: 0.85rem;
color: #555;
margin-top: 0.3rem;
line-height: 1.4;
}
/* Buttons */
.btn-container {
margin-top: 1.5rem;
}
.btn {
display: inline-block;
background: #007BFF;
color: #fff;
text-decoration: none;
padding: 0.6rem 1rem;
border-radius: 4px;
font-size: 1rem;
border: none;
cursor: pointer;
margin-right: 1rem;
transition: background 0.2s ease-in-out;
}
.btn:hover {
background: #0056b3;
}
.btn.reset {
background: #6c757d;
}
.btn.reset:hover {
background: #565e64;
}
/* Error messages */
.error {
color: #dc3545;
font-size: 0.85rem;
margin-top: 0.25rem;
display: none;
}
.error.show {
display: block;
}
/* Results area */
.results {
margin-top: 2rem;
padding: 1.5rem;
background: #fafafa;
border-left: 4px solid #007BFF;
display: none;
border-radius: 4px;
}
.results p {
margin: 0.5rem 0;
font-size: 1rem;
}
.results strong {
color: #007BFF;
}
</style>
</head>
<body>
<h1>Fertilizer Calculator</h1>
<div class="container">
<form id="fertilizerForm">
<!-- General Inputs -->
<div class="section-title">General Inputs</div>
<!-- Target Yield (Y) -->
<div class="form-group">
<div class="label-row">
<label for="yield">Target Yield (Y):</label>
<span class="param-note">(e.g., 50)</span>
</div>
<input
type="number"
id="yield"
name="yield"
step="0.01"
min="0"
placeholder="Enter target yield in kg/ha"
required
/>
<div class="description">
The target yield (Y) is your desired crop yield in kg/ha (or another standard unit).
</div>
<div class="error" id="yieldError">
Please enter a realistic yield > 0 (e.g., 10 to 200).
</div>
</div>
<!-- Nitrogen (N) Inputs -->
<div class="section-title">Nitrogen (N) Parameters</div>
<div class="form-group">
<div class="label-row">
<label for="nrN">N Required Ratio (NR<sub>N</sub>):</label>
<span class="param-note">(e.g., 2)</span>
</div>
<input
type="number"
id="nrN"
name="nrN"
step="0.01"
min="0"
placeholder="N ratio for target yield"
required
/>
<div class="description">
NR<sub>N</sub> represents how much nitrogen is typically required per unit of yield. Ranges often fall between 0.5 – 3.0 depending on the crop.
</div>
<div class="error" id="nrNError">
Please enter a realistic value > 0 (e.g., between 0.1 and 5).
</div>
</div>
<div class="form-group">
<div class="label-row">
<label for="efN">N Efficiency Factor (E<sub>fN</sub>):</label>
<span class="param-note">(0 <= E<sub>fN</sub> <= 1)</span>
</div>
<input
type="number"
id="efN"
name="efN"
step="0.01"
min="0"
max="1"
placeholder="Between 0 and 1"
required
/>
<div class="description">
E<sub>fN</sub> indicates the efficiency of nitrogen uptake, influenced by soil conditions, climate, etc.
</div>
<div class="error" id="efNError">
N Efficiency Factor must be between 0 and 1 (e.g., 0.3, 0.45, 0.8).
</div>
</div>
<div class="form-group">
<div class="label-row">
<label for="esN">Soil Contribution Factor (E<sub>sN</sub>):</label>
<span class="param-note">(0 <= E<sub>sN</sub> <= 1)</span>
</div>
<input
type="number"
id="esN"
name="esN"
step="0.01"
min="0"
max="1"
placeholder="Between 0 and 1"
required
/>
<div class="description">
E<sub>sN</sub> is how much your soil naturally contributes to nitrogen availability (e.g., 0.2).
</div>
<div class="error" id="esNError">
Soil Contribution Factor must be between 0 and 1.
</div>
</div>
<div class="form-group">
<div class="label-row">
<label for="snN">N Soil Test Value (SN<sub>N</sub>):</label>
<span class="param-note">(e.g., 20)</span>
</div>
<input
type="number"
id="snN"
name="snN"
step="0.01"
min="0"
placeholder="N soil test value"
required
/>
<div class="description">
SN<sub>N</sub> is your nitrogen soil test result (e.g., 15 – 40). It helps determine how much N is already available.
</div>
<div class="error" id="snNError">
Please enter a realistic soil test value ≥ 0.
</div>
</div>
<!-- Phosphorus (P) Inputs -->
<div class="section-title">Phosphorus (P) Parameters</div>
<div class="form-group">
<div class="label-row">
<label for="nrP">P Required Ratio (NR<sub>P</sub>):</label>
<span class="param-note">(e.g., 0.6)</span>
</div>
<input
type="number"
id="nrP"
name="nrP"
step="0.01"
min="0"
placeholder="P ratio for target yield"
required
/>
<div class="description">
NR<sub>P</sub> is the phosphorus ratio per yield unit, typically ranges from 0.1 – 1.0 depending on crop demands.
</div>
<div class="error" id="nrPError">
Please enter a realistic value > 0 (e.g., 0.1 to 2).
</div>
</div>
<div class="form-group">
<div class="label-row">
<label for="efP">P Efficiency Factor (E<sub>fP</sub>):</label>
<span class="param-note">(0 <= E<sub>fP</sub> <= 1)</span>
</div>
<input
type="number"
id="efP"
name="efP"
step="0.01"
min="0"
max="1"
placeholder="Between 0 and 1"
required
/>
<div class="description">
E<sub>fP</sub> indicates how effectively phosphorus is taken up by crops under your conditions.
</div>
<div class="error" id="efPError">
P Efficiency Factor must be between 0 and 1.
</div>
</div>
<div class="form-group">
<div class="label-row">
<label for="esP">Soil Contribution Factor (E<sub>sP</sub>):</label>
<span class="param-note">(0 <= E<sub>sP</sub> <= 1)</span>
</div>
<input
type="number"
id="esP"
name="esP"
step="0.01"
min="0"
max="1"
placeholder="Between 0 and 1"
required
/>
<div class="description">
E<sub>sP</sub> is how much phosphorus your soil can naturally supply.
</div>
<div class="error" id="esPError">
Soil Contribution Factor must be between 0 and 1.
</div>
</div>
<div class="form-group">
<div class="label-row">
<label for="snP">P Soil Test Value (SN<sub>P</sub>):</label>
<span class="param-note">(e.g., 15)</span>
</div>
<input
type="number"
id="snP"
name="snP"
step="0.01"
min="0"
placeholder="P soil test value"
required
/>
<div class="description">
SN<sub>P</sub> is your soil test reading for phosphorus (e.g., 5 – 30), guiding how much P is already present.
</div>
<div class="error" id="snPError">
Please enter a realistic soil test value ≥ 0.
</div>
</div>
<!-- Potassium (K) Inputs -->
<div class="section-title">Potassium (K) Parameters</div>
<div class="form-group">
<div class="label-row">
<label for="nrK">K Required Ratio (NR<sub>K</sub>):</label>
<span class="param-note">(e.g., 1)</span>
</div>
<input
type="number"
id="nrK"
name="nrK"
step="0.01"
min="0"
placeholder="K ratio for target yield"
required
/>
<div class="description">
NR<sub>K</sub> is the potassium ratio per yield unit, which could be from 0.3 – 2.0 for many crops.
</div>
<div class="error" id="nrKError">
Please enter a realistic value > 0 (e.g., 0.3 to 5).
</div>
</div>
<div class="form-group">
<div class="label-row">
<label for="efK">K Efficiency Factor (E<sub>fK</sub>):</label>
<span class="param-note">(0 <= E<sub>fK</sub> <= 1)</span>
</div>
<input
type="number"
id="efK"
name="efK"
step="0.01"
min="0"
max="1"
placeholder="Between 0 and 1"
required
/>
<div class="description">
E<sub>fK</sub> indicates how efficiently potassium is used by your crops under local conditions.
</div>
<div class="error" id="efKError">
K Efficiency Factor must be between 0 and 1.
</div>
</div>
<div class="form-group">
<div class="label-row">
<label for="esK">Soil Contribution Factor (E<sub>sK</sub>):</label>
<span class="param-note">(0 <= E<sub>sK</sub> <= 1)</span>
</div>
<input
type="number"
id="esK"
name="esK"
step="0.01"
min="0"
max="1"
placeholder="Between 0 and 1"
required
/>
<div class="description">
E<sub>sK</sub> is the natural potassium supply capacity of your soil.
</div>
<div class="error" id="esKError">
Soil Contribution Factor must be between 0 and 1.
</div>
</div>
<div class="form-group">
<div class="label-row">
<label for="snK">K Soil Test Value (SN<sub>K</sub>):</label>
<span class="param-note">(e.g., 40)</span>
</div>
<input
type="number"
id="snK"
name="snK"
step="0.01"
min="0"
placeholder="K soil test value"
required
/>
<div class="description">
SN<sub>K</sub> is your soil test reading for potassium (e.g., 30 – 100).
</div>
<div class="error" id="snKError">
Please enter a realistic soil test value ≥ 0.
</div>
</div>
<div class="btn-container">
<button type="button" class="btn" id="calculateBtn">Calculate</button>
<button type="reset" class="btn reset" id="resetBtn">Reset</button>
</div>
</form>
<div class="results" id="resultsBox">
<h2>Calculation Results</h2>
<p><strong>Nitrogen (N) Fertilizer Needed:</strong> <span id="nResult"></span> kg/ha</p>
<p><strong>Phosphorus (P) Fertilizer Needed:</strong> <span id="pResult"></span> kg/ha</p>
<p><strong>Potassium (K) Fertilizer Needed:</strong> <span id="kResult"></span> kg/ha</p>
</div>
</div>
<script>
// Grab elements
const form = document.getElementById('fertilizerForm');
const calculateBtn = document.getElementById('calculateBtn');
const resultsBox = document.getElementById('resultsBox');
// General
const yieldInput = document.getElementById('yield');
const yieldError = document.getElementById('yieldError');
// Nitrogen
const nrN = document.getElementById('nrN');
const nrNError = document.getElementById('nrNError');
const efN = document.getElementById('efN');
const efNError = document.getElementById('efNError');
const esN = document.getElementById('esN');
const esNError = document.getElementById('esNError');
const snN = document.getElementById('snN');
const snNError = document.getElementById('snNError');
// Phosphorus
const nrP = document.getElementById('nrP');
const nrPError = document.getElementById('nrPError');
const efP = document.getElementById('efP');
const efPError = document.getElementById('efPError');
const esP = document.getElementById('esP');
const esPError = document.getElementById('esPError');
const snP = document.getElementById('snP');
const snPError = document.getElementById('snPError');
// Potassium
const nrK = document.getElementById('nrK');
const nrKError = document.getElementById('nrKError');
const efK = document.getElementById('efK');
const efKError = document.getElementById('efKError');
const esK = document.getElementById('esK');
const esKError = document.getElementById('esKError');
const snK = document.getElementById('snK');
const snKError = document.getElementById('snKError');
// Results
const nResult = document.getElementById('nResult');
const pResult = document.getElementById('pResult');
const kResult = document.getElementById('kResult');
// Basic front-end validations
function validateInputs() {
let valid = true;
// A function to show/hide error
const showError = (input, errorEl, condition) => {
if (condition) {
errorEl.classList.add('show');
valid = false;
} else {
errorEl.classList.remove('show');
}
};
// Typical yield range check (example: 1–300)
const yVal = Number(yieldInput.value);
showError(yieldInput, yieldError, (yVal <= 0 || yVal > 300));
// N checks
const nrNVal = Number(nrN.value);
showError(nrN, nrNError, (nrNVal <= 0 || nrNVal > 5));
const efNVal = Number(efN.value);
showError(efN, efNError, (efNVal < 0 || efNVal > 1));
const esNVal = Number(esN.value);
showError(esN, esNError, (esNVal < 0 || esNVal > 1));
const snNVal = Number(snN.value);
showError(snN, snNError, (snNVal < 0 || snNVal > 500)); // example soil test upper limit
// P checks
const nrPVal = Number(nrP.value);
showError(nrP, nrPError, (nrPVal <= 0 || nrPVal > 2));
const efPVal = Number(efP.value);
showError(efP, efPError, (efPVal < 0 || efPVal > 1));
const esPVal = Number(esP.value);
showError(esP, esPError, (esPVal < 0 || esPVal > 1));
const snPVal = Number(snP.value);
showError(snP, snPError, (snPVal < 0 || snPVal > 500));
// K checks
const nrKVal = Number(nrK.value);
showError(nrK, nrKError, (nrKVal <= 0 || nrKVal > 5));
const efKVal = Number(efK.value);
showError(efK, efKError, (efKVal < 0 || efKVal > 1));
const esKVal = Number(esK.value);
showError(esK, esKError, (esKVal < 0 || esKVal > 1));
const snKVal = Number(snK.value);
showError(snK, snKError, (snKVal < 0 || snKVal > 1000)); // example upper limit
return valid;
}
// Example formula usage (client-side for demo):
// F_N = (NR_N / E_fN) * Y - (E_sN / E_fN) * SN_N
// Similarly for P, K with their respective parameters.
function calculateFertilizer() {
// Convert to numeric
const Y = Number(yieldInput.value);
// N
const NR_N = Number(nrN.value);
const EfN = Number(efN.value);
const EsN = Number(esN.value);
const SN_N = Number(snN.value);
const F_N = (NR_N / EfN) * Y - (EsN / EfN) * SN_N;
// P
const NR_P = Number(nrP.value);
const EfP = Number(efP.value);
const EsP = Number(esP.value);
const SN_P = Number(snP.value);
const F_P = (NR_P / EfP) * Y - (EsP / EfP) * SN_P;
// K
const NR_K = Number(nrK.value);
const EfK = Number(efK.value);
const EsK = Number(esK.value);
const SN_K = Number(snK.value);
const F_K = (NR_K / EfK) * Y - (EsK / EfK) * SN_K;
// Display results
nResult.textContent = F_N.toFixed(2);
pResult.textContent = F_P.toFixed(2);
kResult.textContent = F_K.toFixed(2);
resultsBox.style.display = 'block';
}
calculateBtn.addEventListener('click', () => {
// Validate inputs before calculation
if (!validateInputs()) {
return;
}
// In production, you'd do a backend call here. We'll do client-side for demonstration.
calculateFertilizer();
});
// Optionally hide results on reset
document.getElementById('resetBtn').addEventListener('click', () => {
resultsBox.style.display = 'none';
});
</script>
</body>
</html> |