春玉米根系形态及土壤理化性质对深松深度的响应研究

以郑单958和先玉335为供试品种,设深松30 cm(CH30)、40 cm(CH40)、50 cm(CH50)3个不同水平,以常规浅旋15 cm(SR)为对照。通过2014、2015两年试验,结果表明,深松可以打破犁底层,降低土壤容重,与对照相比,CH30、CH40、CH50处理的土壤含水量分别提高5.5%、6.0%和7.4%;0~80 cm土层的根长分别增加26.64%、35.96%和47.45%,根表面积分别增加26.82%、42.92%和62.49%,根干重分别增加4.02%、8.48%和13.23%,3个处理间表现为CH50CH40CH30。深松处理干物质较对照平均增加4.8%,各深松处理间差异不显著;产量平均增加4.3%,表现为CH50CH40CH30处理。

Response of Spring Maize Root Morphological Characteristics and Soil Physicochemical Properties to Chiseling Depth

Zhengdan958 and Xianyu335 were used as test materials and set up 3 subsoil tillage depth(CH30, CH40, CH50) and no tillage(SR) as CK, the experiment was accomplished during 2014 and 2015. The results indicated that subsoil tillage can break the plough and reduce soil bulk density, compared with conventional soil management, soil moisture content of CH30, CH40, CH50 respectively increased by 5.5%, 6.0% and 5.5%. The root length of 0-80 cm soil layer increased by 26.64%, 35.96% and 47.45%, root surface area increased by 26.82%, 26.82% and 42.92%, the root dry weight respectively increased by 4.02%, 8.48% and 13.23%, the three treatments was in order of CH50 > CH40 > CH30. Biomass was increased by 4.8% on average in subsoil tillage treatments compared to conventional soil treatment and no significant difference between the subsoil tillage. Grain yield were increased by 4.3% on average in subsoil tillage treatments compared to conventional soil treatment, the subsoil tillage was in order of CH50 > CH40 > CH30.