How to prevent the leaves of Cymbidium from yellowing? A few small links of the rotting roots of Magnolia

In order to restore the normal growth of Cymbidium after yellow leaves, it is necessary to find out the source of the disease and take corresponding measures. The method is: dig out the whole orchid to check the root, such as the rotten root, remove the rotten part, change the new soil and re-cultivate it, and put a layer of fine sand under the root. Loose rotten leaf soil should be used in basin soil, and the pH (pH) should be neutral. The soil is not dry or wet and has good ventilation. Gentleman orchid likes weak light, except in winter, summer should be placed in a half-yin and half-yang place, avoid the direct sun. If the occurrence of "green deficiency" can add liquid fertilizer (such as black alum fertilizer water), the key point is less and more times, be careful not to splash the fertilizer or mud on the leaf, if splashed on the leaf, rinse it off with clean water in time. When applying solid fertilizer, it is better to avoid direct contact with fleshy roots.