Calcium sprays caused no leaf or fruit injury.

calcium atom · crop injury · Malus domestica (apple)Positive and negative results

3 papers in the same direction as this claim · 2 in the opposite direction

1. negative
   Some injury to the fruit surface of apples was observed with Ca treatments.

   Effects of Some Polyamine Biosynthesis Inhibitors and Calcium Chloride on In Vitro Growth and Decay Development in Apples Caused by Botrytis cinerea and Penicillium expansum · 1997

   Opposite direction

2. negative
   Higher calcium concentrations increased lenticel injury incidence.

   MINERAL CONTENT OF DIFFERENT APPLE CULTIVARS IN RELATION TO FRUIT QUALITY DURING STORAGE · 2006

   Opposite direction

3. positive
   Ca treatment inhibited the development of chilling injury symptoms (brown core) in `McIntosh' apples.

   Inhibition of Softening by Polyamine Application in `Golden Delicious' and `McIntosh' Apples · 1991

   Same direction

4. positive
   Calcium deficiency induced marginal scorch of old leaves.

   Sand-culture Studies on the Calcium Nutrition of Young Apple Trees with Particular Reference to Bitter Pit · 1977

   Same directionAbout lacking this nutrient, so it counts the other way round

5. positive
   calcium caseinate reduced to some extent injuries to both fruits and foliage on apple.

   Some Side Lights on Spray Injuries to Apple Fruits and Foliage · 1924

   Same direction

application · crop injury · Malus domestica (apple)Positive and negative results

6 papers in the same direction as this claim · 17 in the opposite direction · 1 reporting no difference from an alternative

1. no effect
   The sprays did not affect cold injury of buds and shoots.

   Effects of preharvest sprays of iodine, selenium and calcium on apple biofortification and their quality and storability · 2023

   Opposite directionCites this paper

2. negative
   Adding X-77 to terbacil increased leaf injury.

   Thinning of Spur `Delicious' Apples by Shade, Terbacil, Carbaryl, and Ethephon · 1990 · compared with terbacil sprays

   Opposite direction

3. no effect
   Spraying the formulation on apple trees caused no phytotoxicity on leaves or fruit.

   Scientific Basis of a Unique Formulation for Reducing Sunburn of Fruits · 2011

   Opposite direction

4. negative
   Glyphosate sprayed on lower apple branches caused local injury in the application year and next year.

   Fate of Glyphosate in Deciduous Fruit Trees · 1976

   Opposite direction

5. negative
   Iodine sprays caused leaf necrosis.

   Iodine Biofortification of Apples and Pears in an Orchard Using Foliar Sprays of Different Composition · 2021

   Opposite direction

6. no effect
   Vapor Gard did not reduce apple moisture stress injury symptoms.

   Effect of a Pinolene-base Antitranspirant on Fruit Growth, Net Photosynthesis, Transpiration, and Shoot Growth of ‘Golden Delicious’ Apple Trees1 · 1978

   Opposite direction

7. negative
   Apples from 1-MCP-sprayed trees and SmartFresh-treated fruit developed more external CO2 injury than untreated fruit.

   EFFECTS OF PREHARVEST AND POSTHARVEST 1-METHYLCYCLOPROPENE TREATMENT ON EXTERNAL CO2 INJURY IN APPLES DURING STORAGE · 2012 · compared with those not treated

   Opposite direction

8. no effect
   Zn spray programs did not influence shoot growth or fruiting performance, and induced no phytotoxicity symptoms, in apple.

   Comparison of Dormant and Circum-bloom Zinc Spray Programs for Washington Apple Orchards · 2007

   Opposite direction

16 papers more in this group