Fruit cracking in tomato can be reduced by soil application of: (RJ AARO Horti. 2014)

✅Explanation:
Fruit cracking in tomatoes is often caused by calcium deficiency and fluctuations in soil moisture. Borax is a source of boron, a micronutrient that plays a crucial role in calcium uptake and cell wall development in plants. Applying borax to the soil helps improve calcium availability, strengthening the fruit's skin and reducing the likelihood of cracking.