Abstract: [Objective] The project aims to study the effects of potassium uptake for nitrogen forms on different types of potassium efficiency genotype cotton under hydroponic condition.[Method] The study was conducted in the hope of finding out the effects of nitrate nitrogen and ammonium nitrogen on the cotton dry matter accumulation and potassium content,potassium accumulation,utilization index and root morphology under the condition of supplying sufficient potassium and inadequate potassium separately by choosing potassium efficiency genotype cotton of Liaomian 18,Jimian 958 and Xinmian 99B.[Result] The dry weight accumulation of root and stem,plant potassium content,accumulation and root morphology was increased by supplying sufficient potassium;Compared with nitrate nitrogen,ammonium nitrogen decreased dry matter accumulation,decreased potassium content and potassium accumulation,and hindered root development.Compared with Xinmian 99B,Liaoning cotton 18 and Jimian 958 in ammonium nitrogen treatment,dry matter accumulation,potassium content,potassium accumulation decreased less.[Conclusion] Compared with nitrate nitrogen,ammonium nitrogen is not conducive to cotton growth and potassium absorption,and potassium inefficient cotton varieties are more sensitive to ammonium nitrogen.

摘要： [目的]水培条件下,研究氮素形态对不同钾效率基因型棉花钾素吸收利用的影响.[方法]选择钾高效基因型棉花品种辽棉18、冀棉958和钾低效基因型棉花品种新棉99B为材料,在充分供钾(K+浓度为2.5mmol/L)或不充分供钾(K+浓度为0.02 mmol/L)条件下,研究两种氮素形态硝态氮和铵态氮对棉花干物质积累、钾含量、钾素积累量、利用指数以及根系形态的影响.[结果]充分供钾可增加棉花根、茎叶干物质积累,提高植物体内钾含量,增加钾积累量,促进根系发育;相比较硝态氮,铵态氮减少于物质积累,降低钾含量和钾积累量,阻碍根系发育;相比新棉99B,辽棉18和冀棉958在铵态氮处理下,干物质积累、钾含量、钾素积累量降低幅度较小.[结论]相比硝态氮,铵态氮不利于棉花生长发育和对钾素的吸收,钾低效基因型棉花品种对铵态氮更为敏感.