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Horticulture · Soil & nutrition · Balance

Nutrient replacement

K replaced at 0.6×

For each nutrient, the amount applied divided by the amount removed in harvested fruit. It shows at a glance whether you are maintaining, building or mining each element — and in fruit the standout is potassium, which leaves the orchard in large quantities every harvest.

Worked example · Applied ÷ removed, by nutrient
Balance 1.0× 1.1× 1.2× 0.6× 1.0× N P K Ca
Applied ÷ removed, by nutrient
The benchmark

A sustainable nutrient budget replaces close to what the crop removes — a replacement ratio near 1.0× per element. Fruit exports large amounts of potassium, so K is the element most often quietly mined below one.

Agriculture Victoria — Horticulture ↗
What it signals

A ratio below one isn’t a problem this season — it’s a deferred one. Potassium mined year after year eventually shows up as poor fruit size, colour and storage that fertiliser can’t quickly fix. Budgeting by element keeps a hidden constraint from ambushing the block.

Data required to calculate
Nutrient applied by elementkg/haFruit nutrient concentrationkg/tFruit yieldt/ha

Silo pulls each of these from the sources the operation already uses, and keeps the figure current automatically.

How to improve it
01

Build a full nutrient budget per block, not just nitrogen.

02

Replace potassium on high-yielding blocks before size and colour slip.

03

Leaf-test annually to catch nutrient decline early.

Questions & answers

What is nutrient replacement?

For each nutrient, the amount applied divided by the amount removed in harvested fruit. It shows at a glance whether you are maintaining, building or mining each element — and in fruit the standout is potassium, which leaves the orchard in large quantities every harvest.

What data do you need to calculate nutrient replacement?

You need: Nutrient applied by element (kg/ha), Fruit nutrient concentration (kg/t), Fruit yield (t/ha). Silo pulls each of these from the sources the operation already uses and keeps the figure current automatically.

What is a good nutrient replacement benchmark?

A sustainable nutrient budget replaces close to what the crop removes — a replacement ratio near 1.0× per element. Fruit exports large amounts of potassium, so K is the element most often quietly mined below one.

How do you improve nutrient replacement?

Build a full nutrient budget per block, not just nitrogen. Replace potassium on high-yielding blocks before size and colour slip. Leaf-test annually to catch nutrient decline early.

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