Most packs of seeds deal with rows and then spacing along the rows, however as with the square foot gardening concept, I'm looking at the square area that is recommended for each vegetable and using that information, and then seeing what modular grid in a planting membrane will give me a similar square area.
It is suggested to sow parsnip seeds thinly in shallow drills about 1cm deep, with rows 25-30cm (10-12 inches) apart, then thin seedlings to their final spacing: 100mm (4") for small roots, 150mm (6") for medium, and 200-250 (8" - 10") for large roots to prevent overcrowding and ensure good growth, keeping soil consistently moist.
So taking the smallest row size of 250mm
250mm x 100mm = 25,000 sq. mm = Small roots
250mm x 150mm = 37,500 sq. mm = Medium roots
250mm x 200mm = 50,000 sq. mm = Large roots
35 hole Planting Membrane with 150mm x 150mm = 22,500 sq.mm
30 Hole Planting Membrane with 200mm x 150mm = 30,000 sq.mm
24 Hole Planting Membrane with 200mm x 200mm = 40,000 sq.mm
20 Hole Planting Membrane with 250mm x 200mm = 50,000 sq.mm
Now Lets consider optimum spacing for Japanese Onions
For Japanese onions in raised beds, aim for 100mm - 150mm (4"- 6") spacing between sets/ seedlings for good bulb size, with rows 250mm - 300mm (10"-12") apart for growth and weeding, though closer spacing (down to 5-10cm) yields smaller, bunching-style onions; plant sets with the tip just peeking above the soil in well-drained, compost-rich soil.
So 250mm x 100mm = 25,000 sq. mm
250mm x 150mm = 37,500 sq. mm
300mm x 100mm = 30,000 sq. mm
300mm x 150mm = 45,000 sq. mm
Looking at the corner holes they will have a smaller area than the rest so I tweaked
the centres from 250mm to 240mm
20 Hole Rev A Planting Membrane with 240mm x 200mm = 48,000 sq.mm
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