Why are my tomato plants yellow on the bottom?

Seeing yellow leaves on the bottom of tomato plants can be concerning. This condition is known as blossom-end rot and is a common problem for tomato growers. In this article, we will discuss the causes of blossom-end rot and how to prevent it from occurring in your tomato plants.

Causes of Blossom-end Rot

Blossom-end rot is caused by a calcium deficiency in the plant. Calcium is necessary for healthy growth and development of plant cell walls, and without it, tomatoes can not receive the nutrition they need to grow properly. As a result, the bottom of the fruit turns yellow and eventually black, making it unappealing and inedible.

Another cause of tomato plants turning yellow on the bottom is inconsistent watering. Water stress can lead to uneven nutrient uptake, which can further exacerbate the calcium deficiency in the plant. Additionally, excessive nitrogen in the soil can cause rapid vegetative growth, which can rob the plant of valuable calcium.

Preventing Blossom-end Rot

The best way to prevent blossom-end rot is to maintain consistent moisture levels in the soil. When irrigating your tomato plants, make sure that the soil is evenly moist but not waterlogged. Heavy or light watering can lead to water stress and exacerbate the calcium deficiency.

It is also important to maintain a healthy soil pH. A pH range of 6.0-6.8 is best for tomato plants, as it allows for efficient nutrient uptake. If your soil pH is too low or high, you may need to add organic matter or limestone to adjust it properly.

Nutrient management is crucial for preventing blossom-end rot. Adding a calcium supplement, like gypsum or bone meal, can help to increase the amount of calcium available to the plant. Additionally, avoid over-fertilizing with nitrogen, as this can hinder calcium uptake in the plant.

Lastly, consider the variety of tomato plants you choose to grow. Some cultivars are more prone to blossom-end rot than others, so look for varieties that are resistant to this condition. By selecting the right plants and providing proper care, you can avoid blossom-end rot altogether.

Conclusion

If you have noticed yellow leaves on the bottom of your tomato plants, do not panic. Blossom-end rot is a common issue for tomato growers, but it can be prevented with proper care and attention. By managing soil moisture, maintaining a healthy soil pH, managing nutrients, and selecting resistant varieties, you can ensure your tomato plants remain healthy and productive throughout the growing season.