Manure Application Rate & How Much Per Acre?

It depends on the manure's nitrogen content, how much of that nitrogen becomes available in the first year, and your target N. The tool divides your target nitrogen by the available nitrogen per tonne to give the tonnes per acre (or hectare). For FYM at a 60 kg N/ha target, that's often around 16 t/acre.

Because only part of a manure's nitrogen is released in the first season — the rest is locked in organic matter and mineralises slowly over later years. The availability factor (about 30% for FYM, up to 60% for poultry) accounts for this, so the rate is based on year-one available N, not total N.

It's the fraction of a manure's total nitrogen that becomes plant-available in the first year. Fresh, low-N manures like FYM release slowly (~30%); nutrient-rich, fast-breaking ones like poultry manure release more (~60%). The tool uses typical factors; warm, moist, well-incorporated soils release more.

Yes — at the rate needed to meet nitrogen, manure also delivers phosphorus (as P₂O₅) and potassium (as K₂O), which are largely available. The tool shows all three so you can reduce or skip your P and K fertiliser accordingly. Often the P and K from manure already meet or exceed crop needs.

Manure carries a lot of phosphorus relative to its nitrogen. Applying enough manure to meet a crop's nitrogen can supply far more phosphorus than the crop removes, and repeating it every year builds up soil P and risks runoff pollution. The warning flags when the P supplied is high so you rotate manure use or apply on a P basis.

Nitrogen-based rates (what this tool gives) maximise the fertiliser value of the manure but can over-apply phosphorus over time. On fields already high in P, switch to a phosphorus-based rate (less manure) and top up nitrogen with a small mineral dose. Rotate where manure goes to spread the P load.

Incorporate it into the soil within a day of spreading — surface manure can lose half its available nitrogen as ammonia to the air. Apply close to the time the crop needs N, keep it covered while stored, and avoid spreading before heavy rain that washes nutrients away.

Yes — pick from FYM, poultry, vermicompost, compost, goat/sheep manure or cattle slurry, and enter the area in acres, hectares, guntha, bigha or m². For a manure not listed, choose the closest type; for best accuracy, have your manure analysed for its actual N-P-K.

It can supply a large share of crop nutrients plus organic matter that improves soil structure, water holding and biology — but matching exact nitrogen timing for high-demand crops can need a small mineral top-up. Use manure as the base and fine-tune with fertiliser; see the Fertilizer (NPK) and Compost & Manure tools.

The N-P-K percentages and availability factors are typical published values (ICAR/extension) good for planning. Real manure varies widely with animal, bedding, storage and moisture, so a manure test gives the most accurate rate. Use this tool to get close, then adjust.