Water and Fertilizer Management of Rhododendron

Cuckoos like weak acidic water, avoid saline-alkali water, watering with river water, Rain Water is better. When pouring tap water, it should be stored for more than 12 hours before it can be used. Families who cultivate a small amount of rhododendron can use goldfish water, which contains nutrients, which is conducive to the growth of rhododendron. The water quality in the north has some alkalinity, so ferrous sulfate can be added to adjust the PH value. When the cuckoo is watered in winter, the water temperature should be close to the soil temperature, and the difference should not be more than 2 ℃. Rhododendron is a shallow-rooted plant, watering should grasp the principle of "see wet, do not dry do not water, watering must be thoroughly". As for the number and frequency of watering should be in accordance with the cuckoo's different growth periods, combined with climate change, to be appropriate. Generally speaking, cuckoo watering can be divided into five stages:

The main results are as follows: (1) during the dormancy period, the rhododendron needs little water from November of that year to February of the following year. Those cultivated in the greenhouse can be watered once every 45 days.

(2) in March, rhododendron began to sprout, and the water demand increased. It is usually watered every 12 days on sunny days.

(3) in April / August, during the period of flowering and sprouting new shoots, rhododendron grows vigorously and needs a lot of water. It should be watered once a day in sunny days, and some of them should be watered in the evening. Spray water on the leaves and the ground during the day. In a long rainy day, it should be discharged from the basin in time, stagnant water, so as not to rot the roots.

(4) in the first ten days of July / September, water should be watered once every morning, and clear water should be sprayed on the leaf surface and the ground at noon to maintain a moist environment. Pay attention to "looking for water" in the afternoon to prevent "falling leaves".

(5) in the middle of September / October, the new shoots of rhododendron stopped growing and began to branch flower buds. The potted soil should be slightly dry and generally watered every 2 days in the morning. It is better for cuckoos to apply fertilizer with rotten liquid fertilizer. After leaving the house to the flower bud before spitting color, mainly to topdressing phosphate fertilizer, every 10 days to apply fishy water, the concentration is 10%, a total of 23 times. Fish fishy water is rich in phosphorus and nitrogen, which can make rhododendron flowers large, good color, thick petals and long flowering period. Fertilizer application should be stopped during the flowering period, otherwise falling flowers and long leaves will not meet the ornamental requirements. To replenish nitrogen fertilizer after flowering, restore the tree and promote shoot and leaf growth, cake liquid fertilizer should be applied 56 times from mid-May to early July with a concentration of 10%. If it rains continuously, you can apply fine crushed biscuit fertilizer. First loosen the soil, then spread the cake fertilizer on the edge of the flowerpot, cover it with a layer of soil, and then seep into the soil with water. Before the cuckoo enters the house after autumn, in order to supply the fertilizer needed for cuckoo bud stage, 12 times rotten cake fertilizer powder and bone powder dry fertilizer should be applied on the basin surface and covered with a layer of culture soil. Winter enters the dormant period, it is not suitable to apply fertilizer.