Sampling Bagged Grain Versus Bulk Grain
Bulk grain is probed from a mass. Bagged grain is chosen from pieces. The grade is only as honest as that choice.
Bulk grain and bagged grain ask for different samples because the grain is organized differently. Bulk is a mass in a truck, a bin, or a hold. Bags are pieces with marks, and the bad piece can sit in the middle of a stack. Using a bulk habit on a bagged lot, or a bag habit on a hold, produces a grade that describes your convenience. Probe technique for trucks is one bulk method, covered at https://goodsandgrain.trade/probe-sampling-a-grain-truck. The mistakes that follow from shortcuts are at https://goodsandgrain.trade/sampling-mistakes-that-skew-grades.
What bulk sampling has to defeat
In a truck or a barge, fines, moisture, and foreign material settle in patterns. A surface scoop misses the pattern. Probes at several depths, or an automatic sampler on a loading stream, exist to cut through it. The sample is then mixed and reduced. For a hold, a sample drawn only from the first minutes of loading describes the first minutes. If the contract cares about the cargo, the plan has to cover the cargo. Say who draws it and when.
Bulk identity is weak once grain is commingled. The sample represents a grade, not a farmer’s original lot, unless the contract kept the lot apart.
What bag sampling has to defeat
Bags make it possible to sample the pretty side of the stack. A honest plan pulls bags from several layers, including bags you did not load last, and enough of them that one perfect bag cannot speak for the shipment. The number should be agreed, not invented when the inspector is already in the warehouse. Empty the chosen bags into a clean mix, or probe the bags with a tool meant for that package, then reduce. Do not shake a handful from the mouth of the easiest sack.
Marks and lot codes matter. A sample that mixes two lot codes without saying so describes a blend you may not have sold. Packing lists exist so the codes are real, as explained at https://goodsandgrain.trade/packing-lists-bagged-grain.
Pulses and foods raise the stakes
Color, splits, and staining in lentils or peas can be a rejection rather than a small discount. Those defects cluster in particular bags. A bulk-style glance at one tote will miss them or, if you chose the bad tote only, overstate them. Pulse trades live on this kind of spec, described at https://goodsandgrain.trade/pulses-as-traded-crops. Agree the sample before the stack is built so the stack can be reached. A wall of bags with no aisle is a wall you cannot sample fairly.
Certificates should name the method
A certificate that says sampled without saying bags or stream or truck probes is a percentage floating in air. Ask the inspector to state the method in ordinary words. If a destination will resample on arrival, the contract should say whose result governs when they differ. Silence is how both samples become bargaining chips.
Seals matter more on bags and containers because the piece can be swapped. Record seal numbers with the sample, not the next day.
Pick the method the cargo actually is
If you are shipping bulk, build a stream or probe plan. If you are shipping bags, build a piece plan and leave aisles. Do not let the cheaper method choose itself. The grade will be used as if it were the cargo. It is only the sample you agreed to draw.
Frequently asked questions
Can I use one probe pattern for a stack of bags?
A truck probe is the wrong picture. Choose bags from several places in the stack, then mix what you take.
Does an automatic sampler replace a plan?
It is a plan only if it actually cuts the stream through the loading, and someone records that it did. A sampler that was off for half the hold sampled half the hold.
Who should decide the bag count?
The contract or the inspection rules the buyer and seller accepted. Deciding during the visit invites a sample that fits the clock rather than the lot.