植物背养与肥料学报2010,16(6)：1539-1545 Plant Nutrition and Fertilizer Science
根区局部灌溉和氮、钾水平对玉米干物质积累
和水肥利用的影响农梦玲，李伏生*，刘水（广西大学农学院，广西南宁530005）
摘要：在玉米某一生育阶段实施根区局部灌溉，探索其水肥供应模式。通过盆栽试验，研究了在不同氮（N）、钾（K)水平下，苗期一拔节期和苗期一抽维期分根区交替滞溉和固定部分根区灌溉对玉米干物质积累、水分利用和 N、K吸收的影响。结果表明，与常规灌溉相比，苗期一拨节期根区局部灌溉总干物质质量降低不明显或略有增加，面水分利用效率明显增加，且不影响玉米对N、K吸收量；而苗期～抽雄期根区局部灌溉虽降低耗水量31.0%～ 38.4%，但明显降低玉米总干物质质量和N、K吸收量。相同灌溉方式下，中等N、K水平（N和K,0均为0.12 g/kg)处理的总干物质质量、地上部和总N、K吸收量比低N、K水平（N和K,O均为0.08g/kg)的明显增加；面高 N、K水平(N和K,O均为0.16g/kg)与中等N、K水平无明显差异。说明适宜N、K水平时在玉米苗期～拔节期进行根区局部灌溉效果较好。
关键词：根区局部灌；玉米；水分利用效率；干物质积累；氮钾吸收
中图分类号：S513.07
文献标识码：A
文章编号：1008505X(2010)06153907
Effects ofpartialroot-zoneirrigationandN,Klevelsondry
massaccumulation，waterandnutrientsuseofmaize
NONG Meng-ling, LI Fu-sheng', LIU Shui
（College of Agronomy，Guangxi University，Nanning 530005,China）
Abstract; Partial root-zone irrigation (PRI) at a given growth stage was carried out to study water and fertilizer supply modes of maize. Under different N and K levels, effects of alternate PRI and fixed PRI on dry mass accumu-lation, water use and N, K uptake of maize during the seedling to jointing and seedling to tasselling stages were studied using the pot experiment. The results show that compared to the conventional irrigation, the total dry masses of maize under the PRI from the seedling to jointing stages are not increased or decreased significantly, while the water use efficiencies are increased without affecting N and K uptakes of maize. However, the total dry mass and N and K uptakes are significantly reduced under the PRI from the seedling to tasselling stages, although the water consumptions are reduced by 31. 0%38. 4%. Under the same irrigation, the total dry mass, shoot and total N and K uptakes under the medium N and K levels (N and K,O 0. 12 g/kg, respectively) are more significantly increased than those of the low N and K levels (N and K, O 0. 08 g/kg, respectively), while those of the high N and K levels(N and K,O 0. 16 g/kg, respectively) are not more significantly increased than those of the medium N and K lev-els. Therefore, the partial root-zone irigation from the seedling to jointing stages of maize is an efficient irrigation method under the medium N and K levels.
Key words: partial root-zone irigation; maize; water use efficiency; dry mass accumulation; N and K uptake
收稿日期：2009-12-25
接受日期：2010-04-07
基金项目：国家自热科学基金项目（50869001)；国家973计划项目（2006CB403406）资助。
作者简介：农梦玲（1980-—），女，广西田东人，硕士，主要从事水土资源利用与环境研究。E-mail：menglingl89@126.com
*通讯作者Tel;07713235314806，E-mail：Ipfu6@163.eom 万方数据