石膏改良苏打盐碱土田间定位试验研究

Researches on Application of Gypsum for the Improvement of Soda Saline and Alkaline Soil

采用石膏改良苏打盐碱土,结果表明,施用石膏后增加了玉米的保苗数,促进了玉米的生长发育,土壤硬度和pH值明显降低,土壤三相比得到改善,根系干重明显增加,土壤中的二价离子增多,一价离子减少,ESP普遍降低,土壤化学性质得到改善;玉米单产增加12.58%～44.31%;同时,施用石膏第二年、第三年的后效作用仍很显著,对高粱、向日葵有极显著的增产作用。

The method of field locational experiment was used to conduct the researches of the improving actions of gypsum on soda saline and alkaline soil.The results showed that the application of gypsum increased the standing number of seedlings and the growth of maize.Af-ter the application of gypsum,the soil pH values were significantly decreased,the hardness of field soil was universally decreased the three phases proportion of maize field were generally improved,the dry weight of roots was significantly increased,Ca 2+ and Mg 2+ were increased,K + and Na + were decreased and ESP were universally decreased,the soil chemical properties were significantly improved.The determination of yield in autumn showed that maize yield per unit area was increased by12.58%～44.31%.Furthermore at the second year and the third year af-ter gypsum was applied,the later effects of gypsum were still very significant,gypsum still had the most significant yield increase effects on sorghum and sunflower.