Exclude diseases of tomatoes from a lack or excess of nitrogen, potassium and phosphorus
A lot of trouble for the gardener delivers growing tomatoes. We all perfectly imagine the winter-spring planting of seedlings on window sills, the export of sufficiently large plants in May-month for permanent residence, worries about the survival rate, etc. But all this is pleasant troubles and concerns. It is much more difficult to get a harvest of these plants when a pest sneaks up on them or, even worse, a disease. Therefore, every gardener should know the "enemies" of tomatoes "in person." Diseases of tomatoes are most often associated with a lack or excess of an element.
Important elements in the life of tomatoes: nitrogen, potassium, phosphorus
Measures taken in time to balance the elements can eliminate virtually any disease of tomato.
The lack of this element leads to the fact that the flowers of the plant do not open, they can simply dry out and fall off. Consequently, the fruit becomes small.The same fruits that have time to ripen, wood and have a sour taste. The growth of the plant itself stops. By the leaves, this problem can be determined by seeing a purple color on their inner side. The upper part of the leaf becomes light green, and later turns yellow.This deficiency can be corrected simply by timely introduction of nitrogen fertilizers. Excess nitrogen is most common in poorly lit greenhouses. Outwardly, this is manifested in small leaves twisted in a ring. In addition, the sheet itself becomes very fragile. Flowers are not formed. This state of plants suggests a disease of tomatoes, which can be "treated" with additional lighting and fertilizer containing potassium.
Potassium deficiency is replenished by fertilization, containingthis element. The “bell” for such a procedure can be leaves that do not just change their color to pale shades; spots like burns appear on the edges of the sheet. Diseases of tomatoes, associated with a lack of potassium, lead to the fact that the leaves simply dry out and crumble, as during autumn leaf fall. Fruits do not get a uniform coloring, their appearance resembles a striped watermelon, the stripes of which alternate between red and green.Inside the striped fruit has brown and black stripes. The taste of the tomato itself is sour. The development of this disease of tomatoes is fraught with the further development of gray rot. Excess potassium is dangerous for plant roots. Increased levels of this element can cause burns to the root system. It is possible to recognize this excess by the lower leaves of plants - on them along the edges necrotic spots can form.
The lack of phosphorus is determined by the underside of the leaves. It is in this part that the veins first appear, then the spots come out, the last stage will be the complete staining of the whole plant in purple. Lack of phosphorus can lead to the fact that the shoots will be very small and thin, leaves fall off, and there will be no harvest. Diseases of tomatoes, starting from an excess of phosphorus, are difficult to recognize. The only accurate sign can be called the appearance of thin and white veins on the sheet itself, later they will take the form of necrotic spots.