高产春玉米灌浆期碳氮积累、转运及叶片衰老特性对深松深度的响应

试验采用深松35 cm（S35）和深松25 cm（S25）及不深松（CK）3个处理，比较分析各处理间吐丝后地上部干物质、氮素积累量的差异和叶片SAPD值、群体叶面积的变化。结果表明，灌浆期地上部干物质、氮素积累量均表现为S35>S25>CK处理，且随着生育进程的推进和深松深度的增加，其差异明显增大。在吐丝后36 d，各深松处理子粒干物质和氮素积累量均占成熟期的60%之上，均以S35最高；棒三叶以下叶片的氮素输出量表现为CK >S25 >S3处理；群体叶面积下降幅度表现为CK >S25 >S35处理，以吐丝后18～36 d下降最为明显；深松处理延缓了穗位叶、穗位上、下第1叶和穗位上第2叶SPAD值的下降。随深松深度的增加深松作用显著，在灌浆后期表现更明显。

Response on Carbon-nitrogen Accumulation and Transportation and Leaf Senescence Characters of High Yield Spring Maize by Subsoiling Depth in Filling Stage

Subsoiling depth 35 cm(S35), 25 cm(S25) and none-subsoiling(CK) as the three treatments, to compare the changes on dry matter mass of overground part, nitrogen accumulation, SPAD of leaf and population LAD after silking stage. The results showed that dry matter mass and nitrogen accumulation amount showed S35 >S25 >CK in anthesis and kernel stage, with time goes by and subsoiling depth deep, the degree increasing. After 36 days in silking stage, dry matter mass and nitrogen accumulation were above 60% of mature stage, S35 was the highest and CK was the lowest. Leaves nitrogen below three ear -leaves showed transportation and transportation amount showed CK >S25 >S35, population LAD showed CK >S25 >S35, especially in the days from 18 to 36 after anthesis and kernel stage, subsoiling treatment made SPAD of the three ear-leaves and the second leaf delay. Given all that, subsoiling was the more significant role by subsoiling depth deep, especially after silking stage.