The causes of tulip leaf yellowing are generally caused by diseases and insect pests, improper watering and fertilization. Today, I'd like to share with you the cause analysis and treatment methods of tulip leaf yellowing.
Cause analysis and treatment of yellow tulip leaves 1. Virus disease
There are many kinds of tulip virus, including mosaic virus and broken color virus.
Mosaic virus can cause yellow stripes or particle like spots on the damaged leaves, dark spots on the petals, and leaf rot in serious cases. It is necessary to pay attention to timely control of aphids and weed eradication.
Broken color virus can cause pale yellow or gray white stripes or irregular spots on diseased leaves, sometimes form flower leaves, light yellow or white stripes or irregular spots on petals, and produce broken color flowers on red or purple varieties. The control method is the same as the general virus disease, but the planting place should be far away from Lily.
In the second half of a month, the tulip should be properly shaded to make the bulbs grow new roots.
Sufficient light is necessary for tulip growth. Insufficient light will lead to poor plant growth, bud falling, plant weakening, leaf color lightening and flowering shortening.
Tulips prefer to be fertilized, and they should be fertilized before planting. Generally, dry chicken manure or decomposed compost is used as base fertilizer, and sufficient irrigation is needed. Plough and rake carefully 2-3 days before planting to ensure loose soil. The liquid fertilizer can be applied 1-2 times after two leaves of the seed ball. The compound fertilizer with balanced nitrogen, phosphorus and potassium should be applied 3-4 times a month in the peak growing season. The fertilization should be stopped in the flowering period, and the liquid fertilizer of potassium dihydrogen phosphate or compound fertilizer should be applied 1-2 times after flowering.
4. Soil problems
Sandy loam soil is better for tulip cultivation, and neutral alkaline soil is better for soil pH value than acidic soil.
In the process of tulip cultivation, excessive irrigation should be avoided, but the water demand should be sufficient within one week after planting, and the water demand should be reduced after germination, especially when the water is not too much at flowering. The watering should be "a small amount for many times". If it is too dry, the growth will be significantly delayed. During the growth of tulip, the air humidity should be kept at about 80%.
Tulip has strong cold resistance. It can endure the low temperature of - 35 ℃ in winter and grow normally at 5 ℃ ~ 8 ℃. It is suitable for forcing cultivation in winter. The forcing cultivation of tulip is to break the dormancy of flower primordium and leaf primordium, eliminate the factors that inhibit the germination of flower bud, promote the differentiation of flower bud, and then make tulip blossom in the unnatural flowering period by artificial warming and light supplement. At present, 5 ℃ and 9 ℃ seed bulbs are common in the market. We usually choose 5 ℃ seed bulbs for Spring Festival flowering promotion cultivation.
First of all, it is necessary to prepare high-quality substrate, which requires both water retention and air permeability. The salinity should not be too high or too acid. The pH value should not be less than 6, and there should be no diseases, pests and harmful substances. The bulbs should be firmly planted in a bed deep enough (at least 5cm deep). In recent years, we have used peat, rotten soil and sand in the ratio of 1 ∶ 1 ∶ 1 as the culture medium, and the effect is better. About half a month before planting, the bed soil was applied with decomposed farm manure as base fertilizer, and added with appropriate amount of carbofuran and carbendazim (or covered with 1% formalin for disinfection), and irrigated fully. Before planting, plough and rake carefully to ensure loose soil.
Because of the high temperature in the greenhouse, tulip will be late vernalization, and it will reduce the effect of low temperature treatment. Therefore, it's better to plant early than late, usually about two months before the Spring Festival, about the first and middle of November. The brown bulb skin was removed before planting and soaked in 50% carbendazim 500 times for about two hours. The spacing between plants and rows is 9 × When planting, the top of bulb is flat or slightly lower than the surface of soil. Proper shallow planting can lead to early flowering, and sometimes tulip bulbs can bloom more than 5 days earlier when they are about 1 / 3 above the surface of soil. After planting, water was poured to promote its rooting.
The above is the reason analysis and treatment of tulip leaf yellowing. Tulip is not difficult to raise, pay attention to the above points, I believe you will not have any problems for the cultivation of tulip.