Crops & Soil

Seed rates, spacing, fertiliser, lime, compost and yield.

• Compost C:N Ratio Calculator The carbon to nitrogen ratio and moisture of a compost mix, and how much of a material brings it to your target.
• Crop Yield Estimate Calculator Estimate grain yield before harvest from heads per square metre, grains per head and thousand grain weight.
• Fertiliser Blending Calculator How much of three fertilisers to mix, and how much filler, to make a batch at a target NPK grade.
• Fertiliser Quantity Calculator How much fertiliser (fertilizer) to apply to supply a target amount of N, P or K, per hectare, per acre and for your whole area.
• Greenhouse Heating Calculator The heater size a greenhouse needs to hold a temperature on the coldest night, from its size, covering, air leakage and temperatures.
• Growing Degree Days Calculator Growing degree days from daily high and low temperatures, using a base temperature, with the simple or capped method, for a day or a season.
• Harvest Estimate Calculator Forecast a field’s total harvest, range and truckloads from sample cuts you weigh.
• Lime Requirement Calculator How much of your liming product to spread, from a soil test recommendation and the product’s neutralising value.
• Manure Application Rate Calculator How much manure or slurry to spread to meet a crop’s nitrogen need, from its tested nutrient content, with the phosphate and potash it adds.
• NPK Ratio Calculator The ratio behind a fertiliser grade such as 20-10-10, the nutrient weight in a bag, and the elemental P and K it contains.
• Plant Population and Row Spacing Calculator Plants per hectare or acre from row and in-row spacing, or the row spacing or in-row spacing that gives a target population.
• Plant Spacing Calculator How many plants fit in a bed at a given spacing, in a square grid or an offset triangular pattern.
• Seed Rate Calculator Seed rate in kg/ha and lb/acre from your target plant population, thousand seed weight, germination and field establishment.
• Yield per Hectare and Acre Calculator Crop yield per hectare and per acre from the amount harvested and the area, in tonnes, tons, pounds and bushels.