Is there any influence of biodynamic preparation 501 on the physiological activity of grape leaves cv. Cesanese d’Affile?

Chemical and Biological Technologies in Agriculture

Table 3 Values of non-destructive analyses [chlorophyll (Chl), quantum yield (QY) and stomatal conductance (gs)] detected directly on leaves in the field during the phenological phase of berry development immediately before the harvesting (BBCH 89)

Treatment	Phenological phases	Chl (µmol/m²)	QY (mol/mol quanta)	gs (µmol H₂0/m² s)
2019
BD-501	BBCH 89	275.51^a	0.36^a	489.58^a
BD	BBCH 89	237.39^b	0.40^a	499.21^a
2020
BD-501	BBCH 89	291.22^a	0.37^a	459.01^a
BD	BBCH 89	263.82^b	0.38^a	417.61^a

The values are the mean (± SD) of six leaves from 60 plants subjected to two treatments. Different letters in the same column for the same year indicate significant differences among samples (p ≤ 0.05)