Training a new planting crew on gel in one morning

Six forty in the morning, twelve new planters, one trestle table, and a supervisor who has two hours before the trucks need to be on the hill. That is the realistic training window on most contracts, and it is enough, provided you spend it on three physical demonstrations instead of a slide deck about polymer chemistry.

What the crew needs by nine o’clock is not a theory of osmotic potential. They need to know what the material looks like dry, what it looks like fully swollen, where it goes in relation to the roots, and what to do when the bag they open is already lumpy. Everything else can be taught on the row.

Twenty minutes of why, in plain numbers

Hold up two clear jars. One holds 500 ml of dry granules, the other the same granules after an hour in water. Pass them round. Then give one number: a kilogram of this material can hold 300 litres, and that 300 litres is not free water sitting in the hole, it is water the roots have to work for. That distinction stops the crew treating it as a drink.

Then the limits, in the same flat voice. It does not replace watering at establishment. It does not fix compacted ground. It will not help if it is sitting on the surface in the sun. Three sentences, no exceptions, and everyone remembers them because they come with an object in their hand.

Three stations, eight minutes each

Set the stations before the crew arrives, because setting them up in front of an audience wastes half the session.

Station one, the bucket. Two litres of water, 10 g of granules, and a timer. The crew watches the swell, feels the texture, and learns that fully hydrated material is heavy and slippery rather than crumbly. This is the station that prevents the most common error, which is applying dry granules and assuming they will behave like the wet ones.

Station two, the hole. A planting board with a root ball in place, cut away so the profile is visible. Show the layer: gel mixed through the backfill that will surround the roots, not dumped in the bottom of the auger hole. Let each person place it once with their hands.

Station three, the mistake. A tray of granules spread on bare soil in the sun, and a second tray mixed into soil. By the end of the morning the first tray is a crust. Do not explain this one. Just leave both trays by the gate and let people look at them at smoko.

Drill the four failures, not the method

New crews rarely get the method wrong once they have done it twice. They get the exceptions wrong, always in the same four ways.

• Dumping a scoop into the bottom of the hole and covering it. The roots sit above a reservoir they cannot reach.
• Spreading it on the surface and walking away. Wind and sun do the rest.
• Doubling the dose because the ground looks dry. Twice the material does not hold twice the plant-available water, and it does change the backfill structure.
• Using it in a mix that already holds water well, such as a peat-heavy container media, at the field rate.

The last one is the quiet one. A crew that has spent a week on sandy revegetation will carry the field habit into a nursery job, and nobody notices until the pots are waterlogged and the roots are brown.

The card, and the sign-off

One laminated card per vehicle, four lines, no more: dose for today’s job, method for today’s job, what to do if the bag is lumpy, who to call. The dose changes between blocks; the card gets rewritten or it becomes wallpaper.

Sign-off should be physical, not a signature on an induction form. Each new planter plants three trees in front of the supervisor, who opens the backfill with a trowel and checks that the material is distributed rather than pocketed. Three trees takes four minutes and catches almost everything.

The failure I remember from a 400-tree day was not a training failure at all. The crew had been taught correctly, then a second gang arrived at lunchtime with a different supervisor and a different method, and by three o’clock the row ends were done two ways. If more than one gang works the block, the morning session has to include both supervisors and both have to agree on the card before the first tree goes in.

Book the session for the morning the crew starts, not the week before. The depth and mixing diagrams in the application guide print cleanly at A4 and save a whiteboard in the dark; send the species, the soil and the block layout and the dose table for the card comes back marked up.