Trace elements play a role in the growth and development of peanuts, such as nitrogen, phosphorus, potassium, etc., which cannot be replaced. Scientifically increasing trace element fertilizers is an important measure for high quality and high yield of peanuts. Iron fertilizer peanuts need to absorb 264 grams of iron for each ton of dry matter formed. In iron deficiency, the plants were short, with few branches, late flowering, less flowers, less root nodule, poor root development, and 1-3 pieces of compound leaf mesophyll below the heart leaf were obviously chlorotic, but the veins were still green. In severe cases, the veins are chlorotic and yellow, and the upper leaves are yellow-white. The leaves of the leaves appear brown necrotic spots until the leaves die. The use of iron fertilizers on iron-deficient soils generally increases peanut production by more than 10%. Application method: First, as base fertilizer. At the time of site preparation, 200-400 g of ferrous sulfate was applied in Mushi, mixed with organic fertilizer or superphosphate, and used as a seed fertilizer. Before sowing, soaking with 0.1% ferrous sulfate solution for 24 hours, remove and dry seed coat; third, spray the roots. When the symptoms of yellowing occur in peanut needle stage, scarring stage or new leaves, they are sprayed with 0.2% ferrous sulfate solution and sprayed once every 5 to 6 days. Continuous spraying is performed 2 or 3 times. For each ton of dry matter formed by a boron fertilizer, 44 grams of boron need to be absorbed. In the absence of boron, the plants are dwarf, with many branches and clusters. The color of the veins of the unfolded heart is shallow, and the rest is dark in color, with light green and white leaves. The leaves are small and shrunken. The tips of the leaves are yellow and gradually expand outward. Dry, leaf brown pillow, so that the petiole can not stand up, even sagging, the old leaves dark gray, plant flowering or even no flowers, the root is easy to aging, expansion ability is weak, minimal roots, the root tip has black spots, easy to necrosis, The nuts are stunted and easily form shellless hollow fruit. Application of boron fertilizer on boron-deficient soil can increase peanut production by 7.8 to 22.5%. Application method: First, as base fertilizer. Mu application of boric acid or borax 0.2 ~ l kg? And organic fertilizer or nitrogen, phosphorus fertilizer mixed application? Second, as a seed fertilizer. Before sowing, soaking with 0.02 ~ 0.05% boric acid or borax solution for 4 ~ 6 hours, or boiled with boric acid or borax 0.4 kg per kilogram of peanut seed; third is for top dressing. Per acre with boric acid or borax 50 to 100 grams, mixed in a small amount of decomposed organic fertilizer, topdressing before flowering; four is the root spray. In the peanut seedling stage, initial flowering stage and flowering stage, spraying with 0.2% boric acid or borax solution. Molybdenum peanuts need to absorb 1.32 grams of molybdenum for each ton of dry matter formed. In the absence of molybdenum, rhizobia's nitrogen fixation is often impeded, so that it usually shows typical symptoms of nitrogen deficiency. According to foreign studies, even in the absence of molybdenum, peanuts can continue to flower, but growth is inhibited. Applying molybdenum fertilizer on molybdenum-deficient soil can increase peanut production by 11.93%. Application method: First, as base fertilizer. When soil preparation, Mushi Molybdate is used for 50~100g, mixed with superphosphate, and used as seed fertilizer. Before sowing, soaking with 0.1 ~ 0.2% ammonium molybdate solution for 3 ~ 5 hours, or with ammonium molybdate according to the seed amount of 0.2 ~ 0.3% seed dressing; third is the root spray. At the seedling and flowering stages of peanuts, they were sprayed with 0.1-0.2% ammonium molybdate solution. Appropriate application of trace fertilizer can increase the output of peanuts and bring good benefits to growers. Electric Meters,electricity meter,smart Electric Meters,Energy Electric Meter Ningbo Cland Medical Instruments Co., Ltd. , http://www.ruipumedical.com