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【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,铵态氮减少干物质积累,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。
【Objective】 Under hydroponic conditions, the effects of nitrogen forms on the uptake and utilization of K by different potassium efficiency genotypes were studied. 【Method】 Potassium-efficient cotton genotypes (Loxian 18, Jimian 958) and K (low efficiency) genotype cotton variety Neo-Nian 99B were selected as materials. After sufficient potassium supply (K concentration 2.5mmol / L) K + concentration was 0.02 mmol / L), the effects of nitrate nitrogen and ammonium nitrogen on cotton dry matter accumulation, potassium content, potassium accumulation, utilization index and root morphology were studied. 【Result】 Adequate potassium supply increased the accumulation of dry matter in roots, stems and leaves of cotton, increased potassium content in plants, increased potassium accumulation and promoted root development. Compared with nitrate nitrogen, ammonium nitrogen reduced dry matter accumulation, reduced potassium content and Compared with new cotton 99B, the dry matter accumulation, potassium content and potassium accumulation of Liaomian 18 and Jimban 958 under ammonium nitrogen treatment decreased less. 【Conclusion】 Compared with nitrate nitrogen, ammonium nitrogen is not conducive to cotton growth and potassium uptake, and potassium inefficient cotton genotype is more sensitive to ammonium nitrogen.