论文部分内容阅读
梨是我国重要果树,但不合理的施肥常会导致梨树营养失衡以及果实品质下降。因此,了解果树的营养需求对于梨产业的可持续发展具有重要意义。本研究以杜梨幼苗为试材,在水培条件下研究了不同硝铵配比(1∶0,N1;3∶1,N2;1∶1,N3;1∶3,N4;0∶1,N5)对杜梨幼苗生长和生理特性的影响。结果表明,在N2处理条件下,植株长势最好,其株高、茎粗、地上部鲜重、叶面积显著高于其他处理,叶片的叶绿素含量、硝酸还原酶(NR)活性亦显著高于其他处理。此外,N2处理植株叶片的可溶性糖、脯氨酸(Pro)等渗透调节物质产生较少,丙二醛(MDA)含量较低,而超氧化物歧化酶(SOD)活性相对较高。综上所述,营养液中硝铵配比为3∶1时,杜梨幼苗受胁迫程度最低,生长和生理状况最佳。该研究可为梨园氮肥的合理施用提供基础数据。
Pear is an important fruit tree in China, but unreasonable fertilization often leads to imbalance of pear nutrition and fruit quality decline. Therefore, to understand the nutritional needs of fruit trees for the sustainable development of the pear industry is of great significance. In this study, the seedlings of pear were used as materials to study the effects of different ratios of ammonium nitrate (1: 0, N1; 3: 1, N2; 1: 1, N3; , N5) on the growth and physiological characteristics of pear. The results showed that under the condition of N2 treatment, the plant grew best and its plant height, stem diameter, shoot fresh weight and leaf area were significantly higher than those of other treatments. The chlorophyll content and nitrate reductase activity of leaves were also significantly higher Other processing. In addition, soluble sugar, proline (Pro) and other osmoregulation substances were less produced in the leaves of N2 treated plants, with lower content of malondialdehyde (MDA) and higher activity of superoxide dismutase (SOD). In summary, nutrient solution ammonium nitrate ratio of 3: 1, Du pear seedling was the lowest degree of stress, the best growth and physiological conditions. This study can provide the basic data for rational application of pear fertilizer in pear orchards.