将定量硫铵装入7×5cm塑料袋中并封口,施用时将其放在距玉米植株10～15厘米范围,扎眼覆土。同时设撮施和袋施加硼、钼、锌微量元素处理,以撒施为对照。在每处理中选有代表性玉米3株,测定南侧穗上功能叶的叶绿素和光合速率。袋施化肥的玉米生长好,袋施和撮施的玉米叶绿素含量比对照提高5.9—7.8%,灌浆期测定光合速率, Quantitative ammonium sulfate into 7 × 5cm plastic bags and sealed, when applied to the corn plants from 10 to 15 cm range, eye-catching soil. At the same time set the summary facilities and bags applied boron, molybdenum, zinc trace elements, to spread as a control. In each treatment, 3 representative maize plants were selected to determine the chlorophyll and photosynthetic rate of functional leaves on the south spike. Corn with bags of chemical fertilizers grew well, the content of chlorophyll of corn increased by 5.9-7.8% compared with the control. The photosynthetic rate,