叶面喷施有机硅对草地早熟禾幼苗生长的影响

摘要

In order to study the effects of organic silicon on the grass seedling morphology and physiological characters of blue-grass, Kentucky bluegrass ( Poa pratensis cv. 'Midnight' ) varieties was selected as tested materials, and seven organic sil-icone fertilizer gradient (0, 1, 2, 2. 5, 3, 4, 5 mmol?L-1 ) was set up. The results showed that adding a certain concen-tration of silicone increased the grass seedling length, seedling dry weight, root length, root dry weight, total length of roots, total surface areas of roots and fibrous root number, and the application of silicon 2. 5 mmol?L-1 had the best performance, which were significantly higher than those of the control (P<0. 05). Spraying silicone reduced leaf cell electrolyte leakage, and improved grassland bluegrass resistance. Spraying different concentrations of silicone significantly improved the silicon con-tent in the upper part of Poa pratensis L. , which 3. 0 mmol?L-1 had the best effect. In summary, the appropriate concentra-tion of organic silicon significantly promoted the growth of Kentucky.%为明确有机硅对草地早熟禾幼苗生长的影响,以草地早熟禾(Poa pratensis L.)品种"午夜"为参试材料,设置7个有机硅肥梯度(0、1、2、2.5、3、4、5 mmol?L-1)进行叶面喷施,研究了不同浓度的有机硅对草地早熟禾苗长、 苗干重、 根长、 根干重、 根系总长、 根系总表面积、 根头数、 叶片相对电导率及地上部硅含量的影响.结果表明,添加一定浓度的有机硅可以增加草地早熟禾的苗长、 苗干重、 根长、 根干重、 根系总长、 根系总表面积和根头数,其中施有机硅2.5 mmol?L-1处理表现最佳,显著高于对照,对根系平均直径有促进作用,但不显著;干旱胁迫下喷施有机硅能够减少叶片细胞电解质的渗漏,保持叶片细胞膜的完整性,提高草地早熟禾抗逆性;喷施不同浓度的有机硅均能显著提高草地早熟禾地上部含硅量,其中喷施3 mmol?L-1有机硅制剂含硅量最高.可见,适宜浓度的有机硅显著促进了草地早熟禾的生长.