The fourth seedling trial moved out of Accelerator trays and into greenhouse beds. Lettuce seedlings were transplanted into a bed out of trays in the second trial. The remainder of the bed was direct-seeded with smooth-leaf spinach for a winter crop.
A section of bed in the middle of the greenhouse was prepared by the addition of residual material from potting soil blends prepared for SeedlingTrial #3. These materials—enriched with assorted types of biochars & fertilizers at various rates—were randomly scattered on the bed, then cultivated into the heavy clay soil by hand with a spading fork. Nearly 300 seedlings from the 3 trays of Seedling Trial #2 were transplanted into 5 rows, with 10-inch spacing between plants and rows.
After transplanting, seedlings in the inner row (left) were side-dressed with traprock dust—a dense, crystalline meta-basalt from western MA. Seedlings in the outer row (right) were side-dressed with Planters II—a gypsum-based rockdust from central CO.
The rest of this bed was divided in 6 sections. Five sections were top-dressed with traprock dust. The other five were:
control: no added fertilizer or biochar
#2 Applechar 1x: half-inch crushed, sifted applewood biochar
#3 Applechar 2x: quarter-inch applewood biochar
#4 Nutri-Carb 1x: half-inch Nutri-Carb (geological carbon from immature coal)
#5 Nutri-Carb 2x: quarter-inch Nutri-Carb
#6 Potting Mix Blend
foreground: direct-seeded smooth-leaf spinach, with traprock dust, biochar & Nutri-Carb
background: lettuce transplants from trays in Seedling Trial #2