How to correctly use chlormequat chloride on the vegetable production?
Chlormequat chloride has an alternate name of CCC. Its market dosage form is 50% Chlormequat- chloride aqueous solution which is the antagonist of gibberellin. Chlormequat chloride can enter the plant body through leaves, sprout, buds, root system and seeds, thus inhibiting the gibberellin biosynthesis in the plant body, controlling plants leggy and promoting reproduction growth. It also can shorten the plants internode, make the plants grow stout, develop the root system, resistant to lodging, deepen the leaves color, thicken the leaves, increase the chlorophyll content, enhance the photosynthesis, increase crops resistance, improve quality and increase production. The Chlormequat chloride applications on vegetable production are as follows.
The usage on tomatoes
Normally one week before 3-4 leaves to planting, spraying by using 50% Chlormequat – chloride aqueous solution to be watered into 2000-2500 times and diluted into 200~250 mg/kg of CCC solution. We can use the sprayer to spray evenly when the seedling is small and the leggy extent is slight, thus making the surface of seedling leaf and stalk completely covered with fine droplets rather than flowing; we can use watering can to spray and pour when the seedling grows bigger and the leggy extent is severe. To use 1 kg diluent per square meter and pay attention to uniform medication to prevent too many local which can cause phytotoxicity.
The usage on pepper
For the pepper of leggy trends, we can use CCC with the spraying concentration of 20~25 mg/kg at the initial flowering stage to inhibit the growth of stems and leaves, make the plants stunt and stout, make the leaves color more dense green, and enhance cold hardiness and drought resistance. We can promote the precocity and seedling production by spaying 100~125 mg/kg CCC solution in the flowering period.
The usage on eggplant
We can promote the precocity and increase production by spray 100~125 mg/kg CCC solution in the flowering period.
The usage on summer lettuce
To spray concentration of 500 mg/kg CCC 1-2 times in the seedling stage of summer lettuce can effectively prevent leggy seedlings; to spray concentration of 350 mg/kg CCC 1 time in 7-10 days (totally 2-3 times) can prevent leggy and promote caulicle expand.
The usage on potato
To use the concentration of 0.2% Chlormequat – chloride aqueous solution twice in the bud stage and initial flowering stage which can obviously increase the wingedyam, shorten the plant, improve the commodity and increase significantly effect on the value-added production.
The usage on other vegetables
When CCC is used on carrots, cabbage and celery, it can inhibit bolting. It can be sprayed before bolting and the concentrations is 4000~8000 mg/kg.
The using effects of CCC are associated with the concentration and 18~25°C is the most suitable medicine temperature. So it is better to spray in the morning, evening or in the gloomy days. After the spraying, we should ban ventilation, the cold bed need to be covered with window frames, plastic greenhouses need to be buckled or close the doors and windows in order to raise the air temperature and promote the liquid absorption. Watering is not allowed after the spaying within one day so as not to reduce its potency. Applying pesticide at noon is not allowed due to the strong sunlight, high temperatures, moisture evaporating fast and liquid too late to be absorbed. Thus may cause phytotoxicity. So it is not allowed to use medicine at this time. If the the leggy phenomenon of the seedlings is not appeared, you’d better not use Chlormequat. Even if the leggy phenomenon appears, you can use CCC less than twice.