Abstract:

A pot experiment was conducted in a greenhouse to investigate the effect of soil application of magnesium (Mg) levels on three different soil types in plant growth, nutrient uptake, grain yield of soybean (Glycine max (L.) Merrill) . The experimental results showed that the plant growth, accumulation of nitrogen, phosphorus and potassium at grain, stem and roots, and grain yield of soybean on three different soil types were significant influenced by application of 60 mg/kg soil Mg fertilizer. Compared to the control, the grain yield of soybean in the cinnamon soil, chestnut-cinnamon soil and fluvo-aquic soil were increased by 15.53%、11.48%and 15.52%, respectively, as Mg supply at 60 mg/kg soil. When Mg fertilizer application rate increased to 180 mg/kg soil was, the grain yield of soybean in fluvo-aquic soil was increased by 19.83% compared with the control, whereas there was no significant increase in grain yield of soybean on the other two kinds of soils. Compared their responses to Mg application within three different soils, the performance of fluvo-aquic soil was better than the other two soils. This study indicates that a reasonable application of nitrogen, phosphorus and potassium fertilizers with appropriate Mg fertilizer supply in the soil containing relatively higher exchangeable Mg content, there is still great potential for increasing crop production.