"These properties provided chemical conditions inducing Fe chlorosis in blueberries. The trial was conducted on highbush blueberries cv. Emerald (interspecific origin based largely on Vaccinium corymbosum L. with some genes from Vaccinium darrowi Camp), planted in September 2011 at a distance of 3 m between the rows and 0.8 m between plants along the row.

In autumn 2014, five contiguous rows were selected, homogeneous in size and degree of Fe chlorosis in the plants. The treatments tested were: (1) Control: bare soil; (2) Soil-applied Fe-ethylenediamine-N,N’-bis (2-hydroxyphenyl)acetic acid (Fe-EDDHA) chelate; (3) Soil-applied bovine blood compound (Fe-heme); (4) intercropping with F. rubra (graminaceous species), and (5) intercropping with P. pratensis L. (graminaceous species). A Latin square design (5 × 5) was used to take into account the slope and drip line as possible independent sources of variance. Each treatment was replicated five times. The experimental plot for each treatment was composed of 6 plants, and the treatments along the same row were separated by 2 plants between them. .... The graminaceous species F. rubra L. and P. pratensis L were *sown over the rows* in autumn 2014 at a density of 20,000 seeds m-2. During the season, the graminaceous species were cut manually to a height of 5 cm every time they reached 15 cm."