摘要
在总氮(N)浓度相等的条件下,研究全硝营养(100%NO3-)和25%增铵营养(NH4+∶NO3-=25%∶75%)对开花期和幼果期番茄植株伤流液各组分含量的影响。结果表明,增铵营养显著增加幼果期伤流液中K的含量,对Ca、Mg、P元素含量没有显著影响;增铵营养下伤流液中NO3-的含量下降、NH4+含量增加,氨基酸、苹果酸等的含量均显著增加,氨基酸/硝态氮含量之比显著提高,表明喜硝作物适当增铵不仅能够提高根系活力,显著促进K的吸收以供果实发育之需,而且提高了植株整体同化N素的能力。
The xylem sap was collected in two growing stages to investigate the effects of enhanced ammonium nutrition （25% replacement of NO3-N by NH4＊-N） on the contents of NH4＋, NO3-, Ca, Mg, K, P, soluble carbohydrate, amino acid, and organic acids during tomato maturation. The results showed that the contents of K, NH4＋, amino acid, soluble carbohydrate and malate, the ratio of amino acid content to NO3 in xylem sap increased significantly under enhanced ammonium nutrition in young fruit stage, while NO： content decreased significantly. No significant effect on the contents of Ca, Mg and P, which indicated that comparing to the single nitrate in solution, enhanced ammonium nutrition could not only improve the root activity in absorbing enough K to meet the requirement of fruit development, but also increase the ability of N metabolism.
出处
《土壤》
CAS
CSCD
北大核心
2009年第5期806-811,共6页
Soils
基金
国家自然科学基金项目(30600382)
土壤与农业可持续发展国家重点实验室开放基金项目(055131)资助
关键词
增铵营养
番茄
伤流液
Enhanced ammonium nutrition, Tomato, Xylem sap
