麻沙泥田增施钙镁肥对烤烟生长和产量的影响

通过田间试验研究麻沙泥田上钙镁肥对烤烟生长和产量的影响。结果表明:在施钙肥条件下,施镁15 kg/hm2的产量最高,高达2709 kg/hm2,比不施镁肥处理增产3.6%。足量施入镁肥或镁肥与钙肥混施具有提高烟苗株高和叶片数,促进其生长的效果,烟叶产量和烤烟等级均表现为随施镁量的增加先增加后降低的趋势。适量施入镁肥具有提高烤烟产量、上等烟叶比例、上中等烟叶比例和产值的作用。施镁可提高烤烟叶片中镁含量,钙肥对镁的吸收具有显著的抑制作用。不施钙时,施入镁肥显著提高烤烟中钾、镁含量,而施入钙肥会对钾镁养分的吸收起到抑制作用,施钙条件下增加镁的施入可大幅度提高烟叶的钾、镁养分含量。在土壤中不施钙肥条件下,施入镁肥对钙的吸收会起副作用,而在施入大量钙肥情况下,施入适量镁肥显著提高烟叶的钙含量。

Effect of Calcium and Magnesium Fertilizer on Growth and Yield of Flue-cured Tobacco in Alluvial Sandy Soil

Field experiment was conducted to investigate the effect of calcium and magnesium fertilizer on the growth and yield of flue-cured tobacco in alluvial sandy soil.The results showed that： under the condition of calcium fertilizer application,the highest yield 2709 kg/hm^2 was obtained by the application of 15 kg/hm^2 magnesium fertilizer,which was 3.6% higher than the yield in the treatment of no magnesium fertilizer application.The single application of sufficient magnesium fertilizer or the mixed application of magnesium fertilizer with calcium fertilizer could increase the plant height and number of leaf,and accelerate the growth of tobacco plants.Both tobacco leaf yield and quality first increased and then decreased along with the increase of magnesium fertilizer application rate.Proper amount of magnesium fertilizer supply could increase the yield,superior tobacco leaf ratio,superior ~ medium tobacco leaf ratio and output value of flue-cured tobacco.The application of magnesium fertilizer could enhance the content of magnesium in tobacco leaves,while calcium fertilizer application observably restrained the absorption of magnesium.When no calcium was supplied,the content of potassium and magnesium in tobacco leaves was remarkably increased by the application of magnesium fertilizer.But it was decreased by the application of calcium fertilizer.Applying magnesium fertilizer could inhibit the absorption of calcium under the condition of no calcium fertilizer application,while applying proper amount of magnesium fertilizer could significantly increase the calcium content in tobacco leaves when plenty of calcium fertilizer was applied.