1.1 Absorption characteristics
Molybdenum is a component of nitrogen-fixing enzyme of soybean rhizobium. The content of molybdenum in soil is sufficient to promote the formation and growth of soybean rhizobium, increase the number of rhizobium, enhance the nitrogen-fixing capacity, promote the absorption and transformation of soybean nutrients, and improve soybean. The chlorophyll content in the leaves promotes the absorption of phosphorus by soybeans. Soybeans are crops that are moderately reactive to molybdenum. The relationship between molybdenum and nitrogen is complicated. When applying nitrate nitrogen fertilizer, soybean absorbs more molybdenum than ammonium. As the amount of ammonium nitrogen applied increased, the molybdenum content of the plants decreased. Simultaneous application of molybdenum fertilizer and phosphate fertilizer can greatly increase fertilizer efficiency, and the relationship between molybdenum and sulfur, molybdenum and copper, molybdenum and iron are all antagonistic. Soybean requirements for molybdenum are not high, and it is determined that only about 300 mg of molybdenum is required for every 100 kg of soybean fruiting body produced. Since molybdenum is not easily leached and lost in the soil, if molybdenum fertilizer is frequently applied, molybdenum will accumulate in the soil, and excessive molybdenum will bring poison. Therefore, the molybdenum supplementation is mostly carried out by seed dressing or foliar spraying. China's soil concentration and molybdenum-deficient areas are distributed in two areas, one is the yellow fluvo-aquic soil in the north and the loess-developed soil, and the other is the southern acidic soil, including red soil, red soil, and brick red soil.
1.2 Application Technology
When the effective molybdenum content of the soil is less than 0.1mg/kg, the application of molybdenum fertilizer has an effect on the yield increase of soybean, and the increase of yield by white pulp soil is most significant in various soils, followed by black soil, sand and loess.
1.2.1 基施
For every ha, use about 5kg of industrial slag containing molybdenum, or ammonium molybdate or 1-1.5kg of sodium molybdate, mix 150-200kg of dry fine soil, mix it evenly into the old ditch, or spread the ground, plow Enter the soil, or open the ditch or apply.
1.2.2 Seed dressing
Using 2-3 g of ammonium molybdate per 1 kg of soybean seeds, ammonium molybdate was dissolved in a small amount of warm water to dissolve. Add water to prepare a 2-3% solution, spray it on the soybean seeds with a sprayer, stir while spraying, mix well and place the seeds in a cool dry place and sow.
1.2.3 Foliage Spraying
Spraying 0.05-0.1% ammonium molybdate solution in the early stage of soybean flowering and initial podging, and applying about 500 kg of liquid per ha
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