I began with a ground application of Bioplin… Problem with my vine grapes was that they were not up taking micro nutrients from the soil. This caused mid season clorosis and early defoliation in the crown of the vine. This problem went away using BioNatural products. Also fruit seemed to ripen more evenly and the yield was up by 50%. I believe this was due to improved fruit set. Berry size on one variety was up by 40%. The overall health of the vines was greatly improved.
I have used the products for 5 years (June 10, 2009). I have stopped using other fertilizers. I like the soil conditioning job Bioplin & NutriTech do & I rely completely on NutriFoliar for feeding the crop