等距开槽结合施用石膏改良苏打盐碱土

采用田间小区试验,研究了等距开槽结合施用石膏对东北松嫩平原西部苏打盐碱土的改良效果。结果表明:等距开槽(20～40cm心土层开槽,槽间距1m)能有效降低开槽点的土壤紧实度,对槽间土壤紧实度也有一定的降低作用,且与对照(不开槽)紧实度的差异达到极显著水平;等距开槽必须结合石膏才能改善土壤的化学性质,加石膏与未加石膏处理的pH和碱化度达到差异显著水平,而电导率值在处理前后差异不显著,开槽松土处理对槽内土壤化学性质改善效果不明显;磷石膏与脱硫石膏在改土效果上差异不显著,石膏配合开槽能有效改善土壤理化性质和植物生长状况,且对槽间土壤改良和植物生长均有一定的促进作用。

Amelioration of soda saline-alkali soil through equidistant slotting in combining with gypsum application

A field plot experiment was conducted to examine the effectiveness of equidistant slotting in combining with gypsum application on the amelioration of soda saline-alkali soil in the west Songnen Plain of Northeast China. Equidistant slotting at the soil depth 20-40 cm and 1 m apart could significantly decrease the degree of soil compaction within the slotted area, as compared with the control (un-slotting), and also, had definite effect in decreasing the soil compactness between the slotted areas. Slotting combined with gypsum application improved the soil chemical properties, with significant difference in soil pH and exchangeable sodium percentage but little difference in soil electrical conductivity between gypsum and no-gypsum treatments. Slotting and subsoiling had little effects on soil chemical properties within the slotted areas. Phosphogypsum and desulfurized gypsum had little difference in ameliorating the soda saline-alkali soil. This study showed that slotting in combining with gypsum application could effectively improve the physical and chemical properties of soda saline-alkali soil and the plant growth within the slotted area, and had definite effect in ameliorating soil properties and in promoting plant growth between the slotted areas.