What symptoms appear when tomatoes are deficient in boron?

When tomatoes are deficient in boron, the new leaves stop growing, and the plant takes on a stunted, wilting state. The small leaves lose their green color and turn yellow or orange-red, the growing point darkens or turns black, the tips of young leaves turn yellow, the leaves become deformed, the old leaves turn a deep green, and the leaf stalks become thickened and brittle; in severe cases the leaves and growing point die, the stems bend, and the inner side of the stem develops brown, corky cracks. The fruit surface develops corky cracks.

I. Causes of boron deficiency in tomatoes

1. Soil acidification: once boron is leached away, applying excessive lime can easily cause boron deficiency.

2. Dry soil and little application of organic fertilizer make it prone to occur.

3. It is also prone to occur when potassium fertilizer is applied in excess.

4. Root uptake is restricted, or the plant has a high boron requirement while the boron supply in the soil is insufficient.

II. Treatment methods for boron deficiency in tomatoes

1. Improve the soil and apply more decomposed organic fertilizer. When improving acidic soil, pay attention to the amount of lime used to prevent excessive lime application from causing boron deficiency.

2. After boron deficiency symptoms appear, spray boron fertilizer on the leaves, generally diluted 800-1200 times, spraying once every 3-4 days until the boron deficiency symptoms disappear.