通过田间试验,分析玉米秸秆不同还田方式对苏打盐碱土 pH、电导率及玉米生长的影响.结果表明,在作物整个生长阶段内,处理HCS与FCS中0～20 cm 土壤pH均低于CK,但30～50 cm略高于CK;处理HCS与FCS中各层土壤EC均低于CK;相比CK,处理HCS与FCS玉米株高、茎粗、穗位高、穗长、穗粗均增加;二者产量分别比CK高6.70％和18.25％.综上,秸秆还田可有效减轻苏打盐碱土的碱害和盐害,促进玉米生长,提高产量,玉米秸秆还田量为1.2 t/hm2的作用效果优于还田量为0.6 t/hm2.
Effects of Straw Returning on pH and Electrical Conductivity and Maize Growth in Soda Saline-alkaline Soil
Through field experiments,the effects of different returning methods of corn straw on pH,elec-trical conductivity,and corn growth in soda saline alkali soil were analyzed.The results showed that throughout the entire growth stage of crops,the pH of the 0～20 cm soil in treatment HCS and FCS were lower than that in CK,but slightly higher than that in 30～50 cm soil.The soil EC of each layer in HCS and FCS were lower than that in CK.Compared with CK,the treatment of HCS and FCS resulted in an increase in plant height,stem diameter,ear position height,ear length,and ear diameter of maize.The yields of both were 6.70％and 18.25％higher than that of CK,respectively.In summary,returning straw to the field could effectively reduce the alkali and salt damage of soda saline alkali soil,promote corn growth,and increase yield.The effect of re-turning corn straw to the field at a rate of 1.2 t/hm2 was better than that at a rate of 0.6 t/hm2.
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