硫素营养对高产夏玉米施用效应的研究

每公顷基施：0（CK）、36．3（S1）、413．85（S2）kg硫时，玉米每公顷产量分别为9784．5、10639．5、11322kg，处理分别比对照增产8．73％和15．71％，并提高了果穗长度，增加了穗行数、行粒数，对千粒重影响不大。随着硫肥用量的增加，植珠的干物质积累量增大，光合势、净同化率提高。CK、S1处理硫的积累强度为“M”曲线，开花、乳熟期为吸收高峰；S2处理为“N”型曲线。玉米生育前期，N、P、K的积累强度表现为S2＞S1＞CK，单株对N、P、K、Mn、Zn、Mg的总吸收量表现为S2＞S1＞CK。另外，缺硫时天冬氨酸升高，精氨酸降低。

EFFECTS OF SULFUR APPLICATION IN HIGH YIELD SUMMER MAIZE

0(CK)、36.3(S1)and 413.85(S2)kg of sulphur applied per hektare.In field experiment got 9784.5、10639.5 and 11322 kg per hektare,respectively.S1 and S2 treatments gave 1.0873 and 1.1571 times grain yield of CK.The application of sulphur increased ear length,rows ear－1,grains row－1 and grains ear－1 .But,S produced little increasment of grain weight.The dry matter,leaf area duration(LAD)and leaf area assimilation(NAR)inceased with the amount of sulphur applied.S,N,P,K,Mn,Zn,Mg absorption in a plant as well as Fe,Mn,Zn content in function leaves increased with amount of sulphur applicated.Sulphur accumulation rate varied among S treatments.