宁夏引黄灌区盐碱地土壤调理剂改良效果评价

Improvement Effect of Soil Tuning Agent on Saline-alkali Irrigation Area of Ningxia

利用田间小区对比试验研究盐渍化土壤上土壤调理剂ORYKTA对土壤p H、脱盐率、盐分离子及水稻产量的影响,评价土壤调理剂应用效果,为其合理利用提供理论支撑。结果表明,在常规施肥基础上增施ORYKTA土壤调理剂可有效降低土壤p H;表层土壤脱盐率为67.8%～69.4%,脱盐效果明显;土壤阴离子减少16.23%～40.7%,土壤阳离子减少22.5%～39.2%;同时,提高了土壤有机质和速效氮含量。ORYKTA土壤调理剂能减少水稻无效分蘖的发生,增加有效穗数,提高成穗率以及结实率,水稻增产率达9.0%～12.0%。综合考虑土壤pH、脱盐率、盐分离子及水稻产量,建议当地盐渍化土壤改良ORYKTA土壤调理剂施用量为3 000 kg/hm2。

Field experiment in Yinnan irrigation area was to research effect of soil conditioner ORYKTA application on soil pH, salt rejection rate, salt ions and rice yield, and to evaluate the application effect of soil conditioner. The results showed that the soil pH of ORYKTA could be effectively reduced by applying ORYKTA on the basis of conventional fertilization. In the surface soil, the desalination rate was 67.8% to 69.4%, the desalination effect was obvious, the soil anions decreased by 16.23% to 40.7%, and the soil cations decreased by 22.5%~39.2%. At the same time, the soil organic matter and rapid nitrogen content were increased. ORYKTA soil conditioning agent could reduce the occurrence of ineffective tillering in rice, increase the number of effective spikes, increase the ear formation and the seed setting rate, and the rice increase rate was 9.0% to 12.0%. Considering soil pH, desalination rate, salt ion and rice yield, it is suggested that the application amount of ORYKTA soil conditioning agent for local saline soil improvement is 3 000 kg/hm^2.