After the garlic grows to a certain period, the scale buds begin to differentiate, the leaves degenerate, the scale buds gradually form garlic cloves, and scales outside the degraded scale buds form the skin of the garlic cloves, which is the general rule of normal garlic growth. Garlic sprouts at the same time, garlic sprouts grow around with a small circle of garlic leaves, 5-7 leaves growing around garlic sprouts. These lobules are the new long leaves of the new clove's skin growing alongside the garlic clams, and the new clove's growing point has not sprouted. This is called the phenomenon of re-growth of degraded garlic leaves, and some of them are called secondary growth phenomena, also known as horsetail garlic. This phenomenon is the phenomenon of re-growth, the phenomenon of ancestral re-emergence, when degraded garlic leaves are exposed to external conditions. Does not belong to "secondary differentiation" because it is the leaf that grows from the crust of the clove, and the new clove has not sprouted. This leafing phenomenon has a greater impact on the yield of garlic aphids, generally reducing production by 30-40%; it has a small impact on the yield of garlic, generally reducing production by 10-20%. The reason for the occurrence: It is related to the sowing date. The rate of leaf sowing in the northern margin of the region before October 10 is high, and sowing is lighter after October 10th, and almost no leaf is sown at the end of October. Associated with mulching. Practice has proved that, where the rate of leaf mulching is high, there is no low leaf area or no foliage. Before October 10, sowing and covering the film, the leaf rate is about 98%. With the amount of nitrogen fertilizer. The rate of leaf production above 50 kg/mu for urea or 150 kg/mu for N, P, and K compound fertilizers is high, while the low leaf rate for the use of base fertilizer with low nitrogen is low. Related to the species. The rate of red-leaf garlic leaves is high, and the rate of white-leaf garlic leaves is low. As early as garlic (dihydrate), there is basically no leaf occurrence (individual plots only account for 2-3%). Related to climate. The same is red garlic, compared with 1996, the same fertilization, sowing at the same time, the same film covering, in 1996 there was basically no leaf phenomenon, but in 1997 it generally occurred leaf phenomenon. Autumn and winter of 1997 were warmer. The current impression is that warm winter is the main reason for the re-growth of degraded garlic leaves. Prevention measures: The phenomenon of re-growth of degraded garlic leaves is the result of a combination of complex causes. If 1-2 factors do not exist, it is possible to avoid or mitigate this phenomenon. Therefore, the following countermeasures should be taken in cultivation: Control the sowing date. Ex situ cultivation in Shandong can be planted in early October, and mulching can be planted in mid-October. The general area can be broadcasted appropriately for 5-7 days. Formula fertilization, loose soil base fertilizer should be dominated by organic fertilizers, fertilizers should be appropriate, and nitrogen, phosphorus, potash fertilizer should be proportionately matched. Prior to sowing, the 50 cm deep soil was loosened to promote the development of the root system to the deep layer and absorb the phosphorus and potassium nutrition of the deep soil.
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