At present, the first ear of the autumn 茬 tomato is about to enter the coloring period. How to take effective measures to help the tomato fruit color evenly become the most concerned issue for the vegetable farmers. Six measures are now summarized for reference.

1. Strictly regulate the temperature. Too high or too low a tomato coloring period will affect the formation of lycopene. Studies have shown that the optimal temperature for lycopene formation is 19 ° C ~ 24 ° C, shed temperature below 14 ° C or higher than 32 ° C will affect the normal production of lycopene. Therefore, at this stage, the temperature regulation of vegetable farms should be 22 °C ~ 26 °C during the day and 15 °C ~ 20 °C during the night.

2. Ensure adequate lighting. Timely remove dust and pollutants from the film, ensure sufficient light conditions, and promote fruit coloring. After the grass is covered, it is necessary to remove the grass cover as early as possible to increase the light time of the tomato fruit.

3. Increase ventilation and light transmission. The plant density should not be too large, so it is necessary to ensure that the ventilation and light transmission in the shed is good, so the probability of occurrence of brown fruit in the plant will be reduced. Measures such as removing excess branches, old leaves, diseased leaves, residual leaves, and hanging reflective curtains on the back wall can be used to increase the illumination time of the fruit in the shed and promote fruit coloration.

4. Balance fertilization. Unreasonable application of fertilizer will seriously affect the coloration of tomato fruit. For example, if there is too much nitrogen, the plant grows too strong. At this time, if the water is insufficient, green shoulder fruit will occur; if it is deficient in nitrogen, it will cause yellowing of the shoulder; in the absence of potassium, The shoulders are yellow-green, and the vascular bundles of the heart are lignified; when boron is absent, the shoulders remain green and have necrotic spots. Control measures: timely supplementing NPK fertilizer, using one kilogram of borax to supplement boron fertilizer. In addition, from now on, each ear of fruit should be topdressed in time when it enters the expansion period. It can be applied with full-nutrient fully water-soluble compound fertilizer (15:15:30 or 20:10:30). Jin fully supplements nutrition to avoid the occurrence of poor fruit coloring due to imbalance of nutrient supply.

5. Small water pouring. The soil should not be too dry, so it is better to see dry and wet. At this stage, in sunny weather, depending on the soil moisture, water can be poured once every 10 days.

6. Spray surface fertilizer. Can be sprayed with shellfish or seaweed or boron-containing compound micro-fertilizer to promote uniform coloration of the fruit.

(Jia Youjiang)