氮素形态对不同钾效率基因型棉花钾素吸收利用及根系形态的影响

发布时间：2019-02-08 19:57

【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。
[Abstract]:[objective] to study the effects of nitrogen forms on potassium uptake and utilization of cotton with different potassium efficiency genotypes under hydroponic conditions. Jimian 958 and Xinmian99B, a cotton cultivar with low potassium efficiency, were used as materials. Under the condition of sufficient potassium supply (K concentration was 2.5mmol/L) or inadequate potassium supply (K concentration was 0.02 mmol/L), The effects of nitrate and ammonium nitrogen on dry matter accumulation, potassium content, potassium accumulation, utilization index and root morphology of cotton were studied. Increase potassium content, increase potassium accumulation, promote root development; Compared with nitrate nitrogen, ammonium nitrogen decreased dry matter accumulation, decreased potassium content and potassium accumulation, and hindered root development. Compared with Xinmian99B, Liaomian18 and Jimian 958 treated with ammonium nitrogen, dry matter accumulation, potassium content and potassium accumulation decreased slightly. [conclusion] compared with nitrate nitrogen, ammonium nitrogen is unfavorable to cotton growth and absorption. Potassium inefficient cotton varieties were more sensitive to ammonium nitrogen.
【作者单位】：新疆农业大学农学院;中国农业科学院棉花研究所/棉花生物学国家重点实验室;
【基金】：国家棉花产业技术体系项目"高产栽培岗位"(CARS-18-17) 新疆维吾尔自治区科技支疆项目"棉花高产液态肥技术的引进与成果应用"(2016ZX08010005) 农业部行业专项"旱地两熟区耕地培肥与合理农作制度"(201503121)~~
【分类号】：S562

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