Guide for the conservation of marigold flowers for monitoring ozone

Guidelines for the conservation of marigold flowers on "monitoring ozone"

Marigold, also known as stinky hibiscus, is an annual herb of the genus Asteraceae, with erect, sturdy stems and branches spreading upward. Marigold is often sown in spring. Because of its large flowers and long flowering period, marigold is often used in flower bed settings. The picture shows a potted marigold.

1. Monitoring effect

Marigold can monitor sulfur dioxide and ozone. Its response to the above two gases is very sensitive, when attacked by sulfur dioxide, its leaves will become gray-white, irregular spots appear between the veins, gradually lose green and yellowing; when attacked by ozone, its leaf surface will become waxy, appear necrotic spots, become white or brown after drying, and become red, purple, black, brown and other colors, and wither ahead of time.

2. Maintenance guidelines

The main results are as follows: (1) it is best to choose plain fired pottery basin or plastic basin for planting marigold, and it is suitable to use porous basin.

(2) soil selection marigold has no strict requirements on soil, but it grows best in sandy loam soil with loose soil, fertility and smooth drainage, and the soil is best fine and fine.

(3) cut the young branches into 10cm as cuttings, leave 2 leaves at the top, and the cut should be smooth. 5g rooting powder, l-2kg mixed with water and 50% carbendazim wettable powder were mixed into the seedling soaking solution, and the cuttings were inserted into the pot soil immediately after invading the medicine, and the depth was about 1 inch and 2 pots high. Gently compact the basin soil, and then pour through the water.

(4) the marigold is fond of sunlight, and sufficient sunlight can significantly improve the quality of flowers.

(5) the suitable temperature for the growth of marigold is 15-25 ℃, and the winter temperature should not be lower than 5 ℃. When the summer temperature is higher than 30 ℃, the plant will grow wildly, making the stem and leaf not compact and flowering less; when the temperature is lower than 10 ℃, the plant can also grow, but the growth rate will slow down.

(6) the watering time and amount of water for watering marigold should be suitable, so as not to accumulate too much water and make the soil slightly wet. The young marigold plants just planted should be sprayed 2-3 times a day in hot weather to keep the basin soil moist. Watering marigold should be based on the principle of "seeing dampness".

(7) the flowering time of fertilized marigold is longer and more nutrients are needed. It likes potash fertilizer, the application ratio of nitrogen fertilizer, phosphate fertilizer and potash fertilizer should be 15:8:25, and the internal demand of topdressing fertilizer is about every 15 days during the growing period. At the peak of flowering, 0.5% potassium dihydrogen phosphate can be used to fertilize the leaf surface.

(8) the marigold can be propagated by sowing or cutting. When sowing and breeding, it can be carried out in a year. When using cuttage propagation, it is appropriate to carry out in May-June, when the plant is easy to survive.

(9) the flowering time of pruned marigold is longer, and the branches and leaves of the plant are dry and senescent in the later stage, which is easy to be crooked, which is not conducive to appreciation. Therefore, it is necessary to remove the unfallen flowers from the plant as soon as possible and apply fertilizer as soon as possible to promote the plant to blossom again.

(10) the florescence of marigold is relatively long, potted plants can be placed on the windowsill, desk, table, or a single branch can be made into a cut flower vase.