Track biomass change across time and field area. Review AGR, RGR, CGR, and percentage gain. Export clean summaries for records, analysis, sharing, and planning.
| Sample | Initial Mass | Final Mass | Initial DM% | Final DM% | Days | Area | CGR | RGR |
|---|---|---|---|---|---|---|---|---|
| Field Plot A | 1200 g | 1980 g | 24 | 29 | 14 | 2 m² | 10.2214 g/m²/day | 0.0492 /day |
Corrected dry mass: Dry Mass = Fresh Mass × (Dry Matter % ÷ 100)
Absolute Growth Rate: AGR = (W2 − W1) ÷ (t2 − t1)
Relative Growth Rate: RGR = (ln W2 − ln W1) ÷ (t2 − t1)
Crop Growth Rate: CGR = (W2 − W1) ÷ [A × (t2 − t1)]
Percent biomass change: ((W2 − W1) ÷ W1) × 100
W1 and W2 are corrected dry masses. A is sampled area. t1 and t2 are the two sampling days.
Crop growth rate measures how quickly plant biomass increases over time. It helps growers compare varieties, fertilizer plans, irrigation schedules, and field conditions. This calculator uses sampled crop mass, dry matter percentage, area, and time interval. It then estimates absolute growth rate, relative growth rate, crop growth rate, daily gain, and percentage change.
Crop growth rate is a key agronomy metric. It expresses dry matter gained per unit area per day. That makes plot comparison easier. AGR shows raw biomass change across the chosen interval. RGR shows growth relative to the starting biomass. Together, these numbers give a broader view of crop performance.
Dry matter is important because fresh samples contain water. Water content can change quickly with irrigation, rainfall, heat, and harvest timing. Two samples may look similar in fresh weight but differ in actual plant material. Entering dry matter percentages reduces that distortion. If you already use oven-dried weights, enter 100 for both dry matter fields.
Use a consistent sampling method. Collect plants from a known ground area. Record the first day and the later day carefully. Weigh both samples using the same approach. The calculator converts units automatically and standardizes the output. A high CGR often signals strong canopy expansion and efficient resource use. A lower RGR can still be normal as crops get larger. Negative values may suggest stress, senescence, disease, lodging, or inconsistent sampling.
This tool supports field trials, greenhouse work, student research, and production records. It helps summarize biomass trends quickly. It also creates exportable reports for seasonal reviews and team sharing. Standardized growth metrics reduce manual conversion errors. They also make it easier to explain crop responses to advisers, researchers, and farm managers.
Crop growth rate is the increase in plant dry matter per unit ground area per unit time. It is commonly reported as grams per square meter per day.
Dry matter percentages correct fresh sample weight for water content. This gives a more reliable measure of real biomass accumulation across dates, fields, and crop stages.
Yes. Enter the fresh biomass values and the matching dry matter percentages for both dates. The calculator converts them into corrected dry mass before computing growth metrics.
A negative CGR means corrected dry biomass decreased during the selected interval. That can happen with stress, leaf loss, maturity, disease, or inconsistent sample collection.
RGR shows how quickly biomass changed relative to the starting biomass. It helps compare early and late growth stages when absolute biomass values are very different.
Choose the unit that matches your sampled ground area. The calculator converts m², hectares, ft², and acres into a standardized area for calculation.
Yes. Use the same sampling method, dry matter approach, and time spacing for both plots. Standardized CGR and RGR outputs make comparison much more meaningful.
Yes. It works for greenhouse benches, trays, pots grouped by area, and research plots, as long as you use a known sampling area and valid biomass data.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.