摘要
用营养液培养方法研究了在缺铁条件下,两种形态氮素(NO-N和NH-N)及老叶遮光对菜豆植株生长、氮、磷、钾、钙、镁的吸收及其在体内分布的影响。在缺铁条件下,NON营养的菜豆新叶出现明显的黄化,遮光可减轻黄化症状,NON的供应甚至可基本上使新叶保持绿色,但对干物质的积累没有明显的影响。NON的供应使钾和钙的吸收明显降低,新叶中的含量也显著低于NON处理。黄化叶中磷的含量较低。新叶中氮和镁的含量在各个处理间差异不大。
The effects of Fe, N forms and shading on growth of bean plants and uptake, distribution of N,P,K,Ca,Mg in bean plants were studied in a solution culture under the controlled conditions. The results showed that the different N forms could innuence the contents of N,P,K,ca,Mg and had no effect on the plant uptake of these elements. In comparison to supply with NO3-N, NH -N appliation caused a significant decline of the Ca, K contents in young leaves, but there were no difference for N and Mg con tents between NO3-N and NH -N tratments. Under the Fe-deficient condition, NO3--N form of nitrogen induced the young leaves to become chloiosis, and the P content in there young leaves was also lower than the young leaves in the treatinents shading of first leaves and the supply with NH -N. The contents of N,P,K,Ca and Mg in first leaves stem and root were also measured.
出处
《中国农业大学学报》
CAS
CSCD
北大核心
1996年第5期27-33,共7页
Journal of China Agricultural University
基金
国家自然科学基金
攀登计划资助
关键词
氮素形态
缺铁
养分吸收
养分分布
遮光
菜豆
nitrogen forms
Fe deficiency
shading
bean plants
uptake and distribution of nutrient