Rosa fertilization management

Depending on the season, it is 25% in summer and 12.5% ​​in winter. A variety of nitrate- and nitrogen-based fertilizers can be used, but urea should not be used, especially on clay ground, because urea can increase soil pH.

Rosa fertilizes both root fertilization and extra-root fertilizer. When full-time, the base fertilizer will be fully applied, and less fertilizer or no fertilizer will be applied in the early stage. The requirement for the Chinese rose to use nitrogen:phosphorous:potassium is 1:1:2 or 1:1:3. Fertilization should master the principle of thin fertilizers. The concentration of top dressing outside the root does not exceed 0.3%. When fertilizing, pay attention to the following situations: Fertilize after flowering to ensure the nutrients needed for the next flowering; apply phosphorus and potash fertilizers after autumn; use less nitrogen fertilizer; fertilize before and after trimming; when spraying fertilizers outside the roots, spray should be uniform and thoughtful Do not spray on rainy or cloudy days, preferably on a sunny and windless morning.

Commonly used fertilizer formulations are: urea 1kg, superphosphate 2kg, potassium sulfate 2kg mixed timely application of 40g per plant. Or urea 1.1kg, general calcium 3.17kg, potassium sulphate 3.17kg, magnesium sulfate 0.45kg mix, immediately use, should not be stored for a long time, the amount of each plant 28g.

Fertilization time and method: Fertilization is usually carried out several days after irrigation, when the soil is not too dry and not wet, and the fertilizer is evenly spread around the plants 20 to 25 cm away from the stem. If the plant density is higher, it can also be applied to the plant, that is, spread in the rows of the plant, and then shallow cultivation of loose soil, irrigation to help the fertilizer dissolved.

Supplemental fertilizers often bloom after the anterior capsule to promote the emergence of new shoots. Or in the early spring, the soil temperature is low, the microbial activity is poor, and the organic fertilizer is released slowly, prompting spring flower buds. It is also applied after pruning or when the plants are short of fertilizer.

Fertilizers can also be dissolved in water to be used as liquid fertilizers, but it is important to pay attention to the application concentration. The ratio of total fertilizer to water should be one-thousandth or two-thousandths of an inch. Excessive concentrations can easily damage roots and cause adverse consequences.

Foliar Fertilization: Foliar fertilization is an auxiliary measure for supplying fertilizer and cannot completely replace soil fertilization. Foliage fertilization with less fertilizer, fast effect, fertilizer in the use of several hours into the sap flow, especially suitable for the absence of a certain element in the rose when the targeted application, it has been accepted by most producers.

Fertilizer mix: It can be mixed according to the needs of the Chinese rose, or it can be used alone. The most common forms of compounding are: urea 1.25g, potassium dihydrogen phosphate 1.25g, water, which constitutes a complete fertilizer of nitrogen, phosphorus and potassium, with a concentration of 2.5 parts per thousand. Another formula is: urea 112.7g, potassium sulfate 112.7g, sulfuric acid Magnesium 56.3 g, iron sulphate 28.2 g, water 284.3 L, concentration 1.25 parts per thousand. The formula for correcting the deficiency of trace elements: manganese sulfate 15g, magnesium sulfate 20g, chelated iron 10g, boric acid 5g, water 25L, and the concentration is 2/1000.

Foliar fertilization time and method: the concentration of solution should be controlled at about two-thousandths, and the high concentration will damage the leaves; when the leaves are too tender, do not use it because it has no ability to absorb nutrients. Both sides of the leaf should be thoroughly wet; before and after rain, not suitable for spraying; spraying in the morning without strong wind; not suitable for spraying in high temperature and in sunny days; spraying with fine spray nozzle; urea can be used in combination with certain insecticide-proof agents, other fertilizers It can also be mixed with pest control agents. In order to increase the effectiveness of foliar fertilizer application, you can add spreading agent to the sprayed fertilizer solution. If not, use neutral soap or washing powder, add appropriate amount of fertilizer solution and spray after foaming.

Spray on the leaves when there are symptoms of fertilizer deficiency. Spray every 7 to 10 days. Spray until the symptoms of fat loss disappear.

The general principles of the fertilization cycle: Before the cultivation of the Chinese rose, a large amount of organic fertilizer is applied and phosphorus fertilizer is added in an appropriate amount. In the early stage of rose cultivation, appropriate amount of urea is applied to promote early-onset hair growth; trimming and the period of active growth of the Chinese rose must be frequently top-dressed.

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