How does the soybean slab system work?

Moisture and FM beyond the net-weight allowance reduce the weight you are paid for, banded by tier with a multiplier (single 1×, double 2×, triple 3×). Damage is a stepped price rebate (% of rate). Cash discount and bardana are further price deductions.

Why is moisture a weight deduction, not a price rebate, for soybean?

The Indian soybean trade prices on a slab/refraction basis: excess moisture and FM are treated as weight you are not paying for, so they scale the net weight (a weight factor), while damage is handled as a price rebate. Mustard FAQ, by contrast, rebates moisture on price above its basis.

Can I match a specific buyer's notice (Goyal, SOYUG, Dhanraj)?

Yes. Every allowance, tier, multiplier, step and rebate is editable and remembered on your device — set them to your buyer's published terms. Defaults are the common 10/2/2 spec.

Soybean quality parity calculator — India

Price a soybean lot on the Indian slab / refraction system: banded moisture and FM weight rebates, a stepped damage price rebate, then cash discount and bardana to a net ₹/quintal and lot value. Every allowance, tier and multiplier editable to your buyer's notice.

Open the Soybean Quality calculator →

What it does

Moisture and FM beyond the net-weight allowance reduce the weight you are paid for (banded by tier × multiplier — single/double/triple). Damage is a stepped price rebate. Cash discount and bardana are further price deductions. The calculator also flags reject ceilings.

The formula

Banded excess over the allowance: width in (free, T1] × M1 + width in (T1, T2] × M2, for moisture and FM.
weight factor = 1 − (moisture wt% + FM wt%) ÷ 100
Damage: 0 within allowance, else a step rebate (≤ step or > step) as % of base rate.
price net = (base rate + damage rebate) − cash discount
bardana ₹/qtl = (100 ÷ bag kg) × ₹/bag
net effective rate = price net × weight factor − bardana

Worked example

Clean 10/2/2 lot at base ₹7,300/qtl (moisture 10%, FM 2%, damage 2% — all exactly at allowance, 50 kg bags, ₹20 bardana):

Moisture & FM at allowance → weight deduction 0% wt, weight factor 1.00
Damage 2% = allowance → damage rebate ₹0
Bardana = (100 ÷ 50) × 20 = −₹40/qtl
Net effective rate = 7,300 × 1.00 − 40 = ₹7,260/quintal · within spec ✓

Off-spec lot — moisture 11%, FM 3%, damage 5%: moisture wt 2.00%, FM wt 1.00% → weight factor 0.97; damage step rebate 0.25% of rate ≈ −₹18; net effective rate ≈ ₹7,023/quintal.

Why is moisture a weight deduction for soybean?

The soybean trade prices on a slab/refraction basis — excess moisture and FM are weight you are not paying for, so they scale net weight. Damage is the price rebate. This differs from mustard FAQ quality parity.

Can I match a specific buyer's notice?

Yes — every allowance, tier, multiplier, step and rebate is editable and remembered; defaults are the common 10/2/2 spec.

Mustard FAQ quality parity · Soybean crush parity · Mandi landed cost · Full methodology · FAQ