Effect of organic treatments with calcium carbonate and bio-activator on quality of ‘Reinette’ apple cultivars

Control efficacy of Ca‐containing foliar fertilizers on bitter pit in bagged ‘Fuji’ apple and effects on the Ca and N contents of apple fruits and leaves

“…The results in our study indicated that the tested Ca fertilizers containing CaCl 2 , Ca(NO 3 ) 2 and especially Ca(HCOO) 2 could potentially help to reduce BP incidence in bagged apples and improve the mineral nutrient content in bagged apple fruits. Our results also confirmed the positive effects of Ca‐containing foliar fertilizers on reducing the BP incidence as well as improving the mineral nutrient contents in bagged apple fruits, as described previously …”

Bitter pit in apples: pre- and postharvest factors: A review

“…But, interaction of elements such as K/Ca and Na/Ca, P/Ca and Mg/Ca, showed closer connection with bitter pit than same elements individually (Ben, 1998). This was confirmed by numerous authors who concluded that relationship of Ca with other elements, such as K, N, P, Mg and Mn is important (Ben, 1995b;Biškup et al, 2003b;Kim & Ko, 2004a, b;Dilmaghani et al, 2005;Amarante et al, 2006;Porro et al, 2006;Martsynkevich & Krivorot, 2007;Guerra et al, 2011). Intensive spraying with Ca preparations is recommended only when fruits establish a critical relation K/Ca, which leads to bitter pit formation (Drahorad & Aichner, 2001).…”

“…'Fujiʼ and 'Jonagoldʼ (Moon et al, 1999). Calcium carbonate (CaCO 3 ) reduced bitter pit only after a short storage (Guerra et al, 2011). CaCl 2 applied one week before harvest, increased the firmness of 'Jonagoldʼ after 120 days of storage by 20% (Peryea & Neilsen, 2006).…”

Foliar Calcium Applications for Controlling Fruit Disorders and Storage Life in Deciduous Fruit Trees

“…Guerra et al 15 used CaCO 3 as organic production and confirmed that preharvest foliar treatments of CaCO 3 decreased BP incidence only after 90 days of storage, but that the fruit Ca concentration remained unchanged.…”

“…Foliar Ca application also affected the K, Mg and N concentrations in fruit 6,15 , while eight-time foliar Ca sprays decreased the K concentration and K/Ca ratio of fruit skin 15 . Six-or twelve-time Ca sprays decreased the N/Ca, K/Ca, (K+Mg)/Ca ratios in fruit, hence the conclusion that these ratios reflected the effects of Ca application better than the fruit Ca concentration 6 .…”