Like other cactus plants, dragon fruit grows smaller than conventional fruit trees. Therefore, fertilization should be based on sufficient, small, and multiple principles. The saplings (1~2 years old) are mainly based on nitrogen fertilizer, which is used for thin application and promotes tree growth. Adult trees (3 years old or older) mainly use phosphorus and potassium fertilizers to control the application rate of nitrogen fertilizer.
Fertilization should be carried out in the spring germination stage and fruit expansion period. The fertilizer is usually formulated with 1:2:7 of dried cake residue, chicken manure and pig manure, and 25 kg of organic fertilizer per plant per year. Or in July, October, and March of each year, each plant will be composted with 1.2 kilograms of cow dung and 200 grams of compound fertilizer.
The root system of dragon fruit is mainly distributed in the topsoil layer, so the application of the method should be carried out by applying the method of spreading, so as to avoid damage to the root. In addition, after each batch of young fruit was formed, 0.3% magnesium sulfate 0.2% borax 0.3% potassium dihydrogen phosphate was sprayed once a day to improve the fruit quality.
Due to the long harvest period of dragon fruit, it is necessary to re-apply organic fertilizer, and the nitrogen, phosphorus and potassium compound fertilizer should be balanced and applied for a long time. The use of fertilizers with high nitrogen content in pigs and chicken manures makes the branches more plump, dark green and brittle, easy to break when the wind is strong, the results are large and heavy, the quality is not good, the sweetness is low, and even the sour taste Or salty. Therefore, potassium fertilizer, magnesium fertilizer and bone meal should be added during the flowering period to promote sugar accumulation and improve quality.
Pitaya has many aerial roots that can be converted into absorption roots. If the expansion of the hole is changed, the root distribution can be gradually widened; or the traction can be induced to induce the aerial roots.
(2) Water management
Pitaya grows rapidly in a warm, humid, well-lit environment. The seedling growth period should keep the soil in the whole garden moist. Spring and summer seasons should be watered to keep the roots growing vigorously. During the fruit expansion period, the soil should be kept moist to facilitate fruit growth. Avoid dip for long periods of time during irrigation, and do not spray water from start to finish. Immersion will cause the root system to die in a long-term anoxic state, and the water will cause uneven humidity and induce erythema (physiological lesions). In the rainy weather, the weather should be drained in time to avoid the infection of the bacteria causing the stem meat to rot. The winter garden should control the water to enhance the cold resistance of the branches.
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