文献类型：期刊文章

作　　者：何文寿[1] 李生秀[2] 李辉桃[2]

机构地区：[1]宁夏农学院农学系,宁夏永宁县750105 [2]西北农业大学资源与环境科学系,陕西杨陵712100

出　　处：《中国水稻科学》

年　　份：1998

卷　　号：12

期　　号：4

起止页码：249-252

语　　种：中文

收录情况：BDHX、BDHX1996、BIOSISPREVIEWS、CAB、CAS、CSA、CSA-PROQEUST、CSCD、CSCD2011_2012、IC、JST、PROQUEST、RCCSE、SCOPUS、WOS、ZGKJHX、核心刊

摘　　要：Solution culture experiments were conducted to study N uptake kinetics snd the relatively uptake ofammonium- and nitrate-N by rice (Oryza sativa ) at different growth stages. The relative uptake or the ratios(NH:N/NO-N) of ammonium-N to nitrate-N absorbed by rice varied with its growth stages. At different stages, riceplant had different preference to either ammonium-N or nitrate-N when both NH and NO were present equally inthe nutrient solution. From transplanting to initial tillering, the absorbed ratio was 1. 15 on average, and the absorbed ammonium-N accounted for 53. 48% of the total uptake nitrogen during the same period. During the tilleringperiod, the absorbed ratio was 2. 55 on average, and the absorbed ammonium-N accounted for 71. 8% of the total atthis stage. This phenomenum that rice preferred ammonium-N to nitrate-N during the vegetative growth periodcould be explained by kinetic parameters(Vma. and K.) of absorption. During the reproductive period from elongation to maturity, the absorbed ratios tended more or less towards l, and either of the nitrogen forms could be takenup efficiently by the crop. For the whole growth duration, the absorbed ratios ranged from 0. 98 to 2. 62 with 1. 28on average, the accumulated ammonium-N absorbed being 56. 1 % of the total nitrogen.

关 键 词：溶液培养  吸氮量 铵态氮 硝态氮 水稻

分 类 号：S511.062]