Magnesium Supply Status of Main Soil Types and Effects of Magnesium Fertilizer on Yield and Quality of Crops in Shanxi Province

Abstract

Experiments were conducted with the field investigation,pot and field experiments to study the magnesium supply status of main soil types and effects of Mg fertilizer on yield and quality of crops in Shanxi province.The results showed that the average content of exchangeable Mg in top soils(0-20 cm) of main types of soils in Shanxi province was 255.1 mg/kg,varied from 78.1 to 641.8 mg/kg.The order of exchangeable Mg content in different type soils was fluvo-aquic soil cinnamon soil chestnut-cinnamon soil calcareous cinnamon soil loessal soil cinnamony soil.There were close relationships between exchangeable Mg contents in top soils and major chemical properties in top soils.The biological consumption experiment indicated that Mg biologically availability was higher at cinnamon soil and calcareous cinnamon soil,and then cinnamony soil and loessal soil,the smallest were at chestnut-cinnamon soil and fluvo-aquic soil.Compared with the control(without Mg supply),grain yield of soybean(Glycine max(L.)Merrilli) was increased by 2.77%~9.04%,and corn(Zea mays L.) increased by 2.98%~10.21%.Crude protein content in soybean was increased by 4.56%~7.52%.Crude protein content,total starch contents,and total sugar contents in corn were increased by 9.96%~15.36%,2.41%~6.42%,and 8.52%~12.50%,respectively.Correlation analysis revealed that the significant positive linear relationships between Mg contents in grain and grain yield,crude protein content,and crude fat content in grain of soybean.The significant positive linear relationships between Mg contents in grain and grain yield of corn,and the significant negative linear relationship between Mg content and crude fat content in grain of corn.The significant curvilinear relationships between Mg contents and crude protein content in grain of corn.This study indicated that the contents of exchangeable Mg were at high level in major soils of Shanxi province.The contents of exchangeable Mg and their biological availability were great varied from different types of soils.There were close relationships between the Mg contents and contents of crude protein and fat in grain of crops.Appropriate application of Mg fertilizer could increase grain yield and improve the nutritional quality of crops.

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