The long dormancy (4 months) gives the grower a longer season to harvest, as potatoes do not sprout as quickly. Avalanche sets it’s tubers deep in the row, resulting in less greening and a higher pack out percentage. Avalanche seed must have sprouted at planting. If not less haulm will be produced resulting in lower tuber initiation. If properly sprouted 20 to 30 tubers are initiated per plant on standard seed sizes 35/55mm. Therefore a lower plant population is needed to achieve yield target.
Ensure that the calcium levels are greater than 70% of the Cation exchange capacity. Planting with 1100 kg 4:3:4 (33) in high potential situations, will supply enough nitrogen for early growth. As tuber initiation is very early the extra Nitrogen at planting is critical.
The first topdressing of 200kg LAN (or equivalent) should be done 35 to 40 days after emergence, as Avalanche bulks up early, the plants could suffer from Nitrogen stress. The response time from application to availability to the plant is generally 2 weeks, and this is why nitrogen needs to be applied early in the growing season. Planting and topdressing (as described here) supplies 188kg Nitrogen and should be sufficient for a 60 tonne yield. A yield potential assessment needs to be done at this stage. For each tonne targeted over a 55 tonne yield, a further 3kg of Nitrogen needs to be applied. This Nitrogen needs to be applied no later than 50 days after emergence.
When planting under cool and wet conditions, DO NOT USE ACETOCHLOR or METAZACHLOR as phyto-toxicity has been noticed in Avalanche plantings. Rather use metalochlor or Frontier. When spraying Basagran post emergence, phyto-toxicity has been noticed. Rather use Cato.