Fertilization and medication are the two major guarantees for vegetables to obtain a bumper harvest. When it comes to fertilization, different crops respond differently to different types of fertilizers. It is well known that chlorine-containing fertilizers should not be applied in the cultivation of vegetables such as cabbage, peppers, potatoes, etc., and such crops are often called chlorine-resistant crops. However, there is a special "contraindication" in the cultivation process of eggplant, that is, eggplant is taboo "manganese". Manganese is a necessary trace element for the growth and development of eggplant, and usually the organic fertilizer and the manganese contained in the soil itself are enough to meet the growth needs of eggplant, and no additional application is required. However, in the process of medication, it is often "unintentionally inserted" and has a serious impact on the growth of eggplant.
Among pesticides, mancozeb is a common protective fungicide in production. In the prevention and control of fungal diseases such as downy mildew, powdery mildew, anthracnose, mancozeb has shown good results, and it is not easy to produce resistance. Therefore, in the prevention and control of vegetable diseases, mancozeb is often praised by farmers as a high-quality pesticide that "kills all directions". However, mancozeb is a "no-go" pesticide that needs to be used with caution for the growth of eggplant.
Eggplant is very sensitive to the manganese ions in mancozeb. Once sprayed on the leaf surface, it will have a toxic effect on the mesophyll cells of eggplant, resulting in the loss of physiological functions of mesophyll tissue. The inactive leaf parts will gradually turn yellow or even dry up. Leaf veins are the main channels for manganese ions to be transported on leaves, so they are usually the first sites to be poisoned by manganese ions. In the case of manganese excess, the symptoms manifested are more pronounced. If pesticides such as mancozeb, alum, dew, Sukejing, and Dasheng containing manganese ions are sprayed repeatedly and repeatedly, the yellowing of the leaf along the leaf vein will be aggravated, and eventually cause the leaf to fall off.
Leaves are the functional organs of eggplant photosynthesis to produce organic nutrients. Premature leaf shedding will have a serious impact on the yield, commerciality, etc. of eggplant. Therefore, after the symptoms of manganese poisoning in eggplant leaves, rescue measures need to be taken quickly. The first problem to be solved is to restore the photosynthetic organ, the leaf of the eggplant, to the appropriate area as soon as possible. For this purpose, plant regulators containing cell ** and growth, such as amine fresh ester, gibberellin, brassin, etc., can be sprayed. At the same time, nitrogen fertilizer should be increased appropriately and fruit load should be reduced to promote leaf growth and recovery.
To avoid eggplant manganese poisoning, the key is to choose the right pesticide. Alternative pesticides include broad-spectrum fungicides such as carbendazim and chlorothalonil. These pesticides are more common in production and have a more stable application effect. However, it should be noted that in order to fully exert the effect of the drug, the time of administration should be early in the disease.
In general, the growth of eggplant is very sensitive to manganese, so it is necessary to choose pesticides carefully and avoid using manganese-containing agents during the application process. Rational fertilization and scientific use of medicine will be important measures to ensure a bumper harvest of eggplant.
Spring ploughing in progress