How to apply potash fertilizer to sunflower? What are the main points of potted plants?

Sunflower is a very beautiful flower, because growing toward the sun represents a positive attitude towards life. How to apply potash fertilizer in the process of sunflower planting? What are the main points of potted plants? Let's take a look at it together.

First, how to apply potash fertilizer to sunflowers?

1. Soil conditions

The effect of applying potassium fertilizer is obvious in the soil with low available potassium content, and potassium application can increase the oil content and oil yield of sunflower. At present, the critical value of soil potassium supply in China is not a definite value or a line, but a range value, that is, the critical value of soil potassium supply is set in the range of 70mg / kg. For example, in North America, the critical level of potassium available to soil crops in the north is set at between 40mg / kg and 150mg / kg; however, some states have made it clear in their fertilization recommendations that for new high-yield hybrid sunflower varieties, the critical level of soil potassium should be higher than 105 mg / kg in order to achieve good yield. It shows that the effective application of potash fertilizer depends on the requirements of variety and target yield level. In some cases, potassium crops are effective even if there is no lack of potassium in the soil.

2. Target yield level and variety difference

Different crops grow in the same soil, their requirements for the critical level of soil potassium supply will be somewhat different. The oil content of sunflower seed is very high, and it is a crop with high potassium absorption, which requires a high critical level of soil available potassium. At the same time, the target yield level and the differences between varieties should also be considered. For example, the new high-yield hybrid sunflower requires that the critical level of soil potassium is higher than the general index level in order to obtain good yield and give full play to the variety potential of high yield and high oil.

3. The condition without irrigation has a great influence on the fertilizer efficiency of potash fertilizer.

Especially in the critical growth period, ensuring irrigation can make crops use potash fertilizer effectively. If under drought condition, when sunflower is under water stress, potassium fertilizer is more important than nitrogen fertilizer, potassium application can improve the limited water use of sunflower and reduce the transpiration coefficient of sunflower. Therefore, the application of potash fertilizer under the same drought conditions is helpful to improve the drought resistance of sunflowers.

What are the key points of sunflower potted plants?

Sunflowers used for potted plants have a short growth period and can blossom in about 50 days.

The seedling can be raised by point plate and nutrition bowl, and the seedling substrate can be mixed with peat, vermiculite and sand according to the ratio of 2: 1: 1, and a little organic fertilizer can be mixed at the same time. Potted sunflower seeds are small, the top soil capacity is relatively weak, sowing is not easy to be too deep, generally about 1 cm. Covering soil after sowing, light suppression, such as raising seedlings in winter and spring, can be covered with plastic film to keep warm and shorten the time of seedling emergence. Keep the soil moist after sowing, generally 3 to 5 days in summer and 5 to 10 days in winter and spring.

Transplanting as early as possible can not only shorten the slow seedling time, but also prevent the emergence of "tall seedlings". The plant can be transplanted when it grows a pair of true leaves. After two weeks of sowing, sunflower seedlings can grow strong roots. The root system of sunflower seedlings is very strong, which is the basis to ensure a high survival rate of transplanting.

After water and fertilizer management is planted, water should be properly controlled to prevent overgrowth. After budding, the plants should be properly watered according to their growth conditions to meet their growth needs. It is not recommended to apply base fertilizer to avoid excessive fertility and make the stem too thick. Topdressing or foliar spraying can be applied according to plant growth.

The incidence of diseases and insect pests in sunflower is low, the main diseases are bacterial leaf spot, rust, stem rot, powdery mildew and black spot, and the main pests are aphids, blind bugs, red spiders and beetles.