First, adjust the fertilizer and water. During the growth of asparagus, there is no need to apply fertilizer too frequently. Generally, it is only suitable for topdressing in spring and autumn, and dilute decomposed human manure or low-concentration compound fertilizer solution, or rice washing water and soybean juice water are applied every 18 ~ 15 days. High temperature in summer and low temperature in winter are not suitable for fertilization. Fertilization should be controlled not too much or too late. Water without watering. When it is dry, water it thoroughly at one time, and don't leave waterlogging on the basin surface. Dust on the leaf surface should be sprayed regularly to remove dust.
Second, proper placement. Asparagus likes semi-cloudy, semi-sunny and slightly wet environments.
Third, stay away from heating, air conditioning and TV sets.
Fourth, heat preservation, the lowest room temperature can not be lower than 5℃. If the room temperature is between 0℃ and 4℃, cover it with plastic to keep out the cold.
Fifth, plastic surgery in time. Asparagus tends to clump. In spring, when changing pots and adding soil, prune old and residual fibrous roots and redundant stems and leaves to avoid excessive consumption of nutrients, which plays a role in supporting roots and protecting leaves. Cut off the local yellow leaves; If the stems and leaves are yellow at the same time, they should be cut off together.
There are several reasons why asparagus leaves turn yellow:
First, asparagus is placed near heating or air conditioning for a long time, not only the whole feather turns yellow and falls off, but also the stem will dry up.
Second, asparagus will gradually dry up when it is placed next to the TV.
Third, neglect watering, or only watering the surface pot soil, the roots did not absorb enough water, and the stems and leaves slowly turned yellow.
Fourth, excessive watering leads to root rot, and then stems and leaves wither.
5. Fertilizers with improper fertilization, high concentration or immature application are easy to burn seedlings and dry up, and long-term topdressing will also lead to yellowing of fertilizer efficiency.
Six, placed in a cool environment for a long time, the plant grows weak and then turns yellow.
Seven, suffering from freezing damage, resulting in yellowing of branches and leaves.