A letter from a reader from Hangzhou Tianzhu, Zhejiang Province asked: I collected some egg shells and bean dregs, placed it in jars and sealed it for 6 months, drained the fertilizer solution, and added 20 times more water, which was used for pouring potted plants. Most potted plants The growth was good, but there were two pots of rhododendrons that died of dead leaves a few days later. Rhododendron fertilizer should pay attention to what? A: After your cuckoo has applied the retort organic fertilizer solution, there is an abnormal deciduous death. There may be the following reasons: First, there may be a small amount of salt (sodium chloride) in the eggshell and dregs. The rhizomes of the rhododendrons are more sensitive to sodium ions, causing them to die of deciduous roots. The second is a 5% concentration, which may be a little stronger for the hairy roots of azaleas, or the last remaining fertilizer solution, which will have a higher concentration, making the plants harder to resist. Third, the timing of fertilization is not appropriate. For example, after flowering, after the new root tip has just been extended, or when the temperature is higher than 32°C, the azalea's absorption function is very weak, resulting in damage to the roots and the leaves of the plants. . In addition, Rhododendron is not suitable for irrigation with well water, especially deep well water. Long-term use of well water irrigation rhododendron can easily lead to decreased root activity, causing plant death. Rhododendron fertilization should be based on the needs of different growth periods. Before flowering, topdressing with phosphate fertilizer, 0.2% potassium dihydrogen phosphate can be sprayed on the foliar or roots, once every 10 days, 2 times to 3 times. Stop fertilization during flowering, spend 10 days to 15 days after flower Xie and then add topdressing nitrogen fertilizer, available 3% organic fertilizer solution, can also be used 0.2% urea solution, promote plant shoot tip long leaves. From July to August in the hot season, plant growth is stagnant and fertilization is not appropriate. After the cool season in autumn, it is necessary to apply more phosphate fertilizer for the bud enlargement period, once every 10 days. After winter, if the temperature of the greenhouse is lower than 13°C, the plants will stop growing and fertilizer should be stopped in time. Rhododendron fertilization should pay attention to thin fertilization facilities, organic fertilizer does not stain the foliage. Fertilization is best done in the evening on a sunny day, when the potted soil is dry, and then sprayed with fresh water the next morning to help dissolve the fertilizer in the soil and make it easier for the root system to absorb.
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