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Zhaoan County in recent years corn planting area of ​​about 100,000 acres. During the growth and development of corn, in addition to nitrogen, phosphorus, potassium, and three major nutrient elements, boron, zinc, manganese, molybdenum, and other trace elements are also needed. However, Zhaoan County is dominated by dry slopes and there is a serious lack of trace elements in soil. Therefore, to seize the high yield of corn, we must pay attention to the symptomatic application of trace fertilizer. 1, zinc deficiency symptoms and remedies: Symptoms: plant growth is slow, internode shortening. Zinc deficiency at the seedling stage and early growth stage. The lower half of the new leaf appears pale yellow or white. This leaf grows yellowish to lacquer-green streaks between the veins. White or yellow tissue can even be seen between the midrib and the edges. Broadband or necrotic spots, showing "flower-shaped". When the zinc is severely deficient, the tip of the leaf begins to have a pale white disease, after which the leaves suddenly turn black and have a special metallic luster. The plants die after 3-5 days. During the late growth period, zinc deficiency occurs, and the silking and tasseling periods of the ear are delayed. The ear is short of seed and bald. Remedy: Foliar spraying 0.1% -0, 2% zinc sulfate solution 2-3 times, 7-10 days once per acre spray fertilizer about 50 kg. 2. Symptoms and Symptoms of Boron Deficiency Symptoms: weak young leaves do not spread out, white tissue appears, leaves easily wither, white stripes between the old leaf veins, thin and short plant growth, ear deformities, uneven grain alignment, shrinkage, top grain defects. . Remedy: Foliar spraying borax solution 2-3 times, spraying about 10 days, spray 0.2% per acre boric acid or borax solution 50 kg. If you choose borax, first use a small amount of warm water to dissolve it and then add fresh water and spray it in time. 3. Symptoms of manganese deficiency and remedy: The young leaves turn yellow, and the leaves appear chlorometric yellow stripes parallel to the veins, while the veins remain green, yellow stripes can gradually expand to form variegated spots, and the leaves are soft and sagging. Remedy: Spray foliar 0.05% -0, 1% manganese sulfate solution, 5-7 days once, even spray 2 times, each with about 50 kg per mu. 4, lack of molybdenum symptoms and remedies. Symptoms: Firstly, it is expressed on the old leaves. The veins between the veins turn green and yellow, the edges of the leaves are scorched and curled inwards, and the corn kernels shrink and the ripening period is delayed. Remedy: Spray 2 times of ammonium molybdate solution continuously, each time use 50g of ammonium molybdate per acre. Dissolve it first with a small amount of warm water, then add 50 kg of water and dilute it evenly.