Ratoon Yield & Plan When To Replant

A ratoon is the regrowth that comes up from the stubble and roots after a crop is harvested, without replanting. Crops like sugarcane, sorghum, rice and banana are commonly ratooned — you cut the plant crop, let the stools sprout again, and harvest the regrowth as the first ratoon, then the second, and so on.

Each successive ratoon usually yields less than the plant crop — commonly a 10–25% drop per ratoon. Vigour falls as the stool ages, gaps appear where stools die, pests and diseases build up in the field, and soil fertility is drawn down. The decline compounds, so the third or fourth ratoon can be well below the original crop.

Start with the plant-crop yield, then apply the decline percentage for each ratoon: ratoon 1 = plant × (1 − decline), ratoon 2 = ratoon 1 × (1 − decline), and so on. The total cycle yield is the plant crop plus every ratoon added together, and the average per year is that total divided by the number of seasons.

Because yield falls each time, most growers take only 2–3 ratoons before ploughing out and replanting. The break-even point is where the extra ratoon yields so little that a fresh plant crop — despite its seed and land-prep cost — pays better. This calculator's per-ratoon and average figures help you spot that point.

Ratooning saves the cost of seed material (cane setts, suckers, seed) and land preparation, and the regrowth establishes faster than a new crop because the root system is already there. That earlier harvest and lower establishment cost is why ratooning stays profitable for the first one or two cycles even as yield slips.

Good stubble management is key: cut stubble low and clean, remove trash or manage it as mulch, gap-fill dead stools quickly, and give the ratoon prompt fertiliser, irrigation and pest control. A well-managed ratoon can hold yield far better than a neglected one, stretching the profitable life of the field.

Sugarcane is the classic ratoon crop, often taking 2–4 ratoons. Sorghum and some rice varieties are ratooned for a quick second harvest, and banana plantations run on successive ratoon cycles from suckers. The same yield-decline logic applies to all of them — only the typical decline rate differs.

If you have field records, use your own measured drop between the plant crop and the first ratoon. Without records, 10–15% is a reasonable starting point for a well-managed crop and 20–25% for poorly managed or older fields. Adjust the input and watch how the total and average change.

They're planning estimates. Real ratoon yields vary with variety, season, soil, water and how well the stubble is managed, and the decline is rarely perfectly constant. Use the figures to compare scenarios and decide when to replant — re-check against your own harvest records and adjust each season.