不同时期施硫对夏玉米硫积累和籽粒品质的影响

为了探明不同时期施硫对夏玉米植株硫积累和籽粒品质的影响，在田间条件下对高产夏玉米（‘农大108’和‘金海5号’）进行不同时期（一次性基施，分别与大喇叭口期、开花期分期施）等量施硫（40 kg/hm2）处理。试验结果表明，在本试验肥力条件下一次性基施、基施和开花期施硫肥均显著提高植株硫积累量；各器官中叶片硫积累量最高，穗轴积累量最低。各时期施硫处理显著提高‘金海5号’籽粒中可溶性糖含量，其中硫肥100%基施和硫肥50%基施+50%开花期分别高于对照21.0%和15.5%，而对‘农大108’影响不显著；各时期施硫处理对两品种籽粒淀粉和粗蛋白含量均没有显著影响。

Effects of Sulphur Supply at Different Stages on the Sulphur Accumulation and Grain Quality of Summer Maize

To study the effects of sulphur supply at different stages on the sulphur accumulation and grain quality of summer maize,the field experiment was conducted with two cultivars of summer maize‘（Nongda108’and‘Jinhai5’） by supplying sulphur（40 kg/hm 2） at different growth stages（before sowing,the big trumpet,and the flowering separately） .The results showed that sulphur accumulation in the shoot increased obviously when all sulphur supply before sowing or half of sulphur supply before sowing and the remaining half top dressed at flowering stage.Among all individual plant organs,the sulphur content in the leaves was the highest,and the cobs contain smaller proportion.Sulphur supply could increase the total content of soluble sugar in the grains of‘Jinhai5’,and the total content of soluble sugar of all sulphur supply before sowing or half of sulphur supplyb efore sowing and the remaining half top dressed at flowering stage was 21.0% and 15.5% higher than CK separately,while the soluble sugar in the grains of‘Nongda108’was unaffected.However,the content of the starch and the protein in grains were unaffected for both cultivars.