根外追肥对紫丁香叶片几种渗透调节物质含量的影响

研究了营养元素(氮、磷、钾及微量元素铁、锰)单一与不同组合及配比根外追肥对紫丁香几种渗透调节物质含量的影响,以期为紫丁香根外追肥选择合理施肥方案提供理论依据。试验在田间条件下,设置清水对照(D1)、0.46%氮(D2)、0.46%氮+0.20%磷(D3)、0.46%氮+0.20%磷+0.10%钾(D4)、0.46%氮+0.20%磷+0.10%钾+微量元素(0.70mg/kg铁+0.10mg/kg锰)(D5)5个处理,3次重复。分别于5月1日、5月27日、7月7日、8月7日、8月27和9月4日进行根外追肥,分别于5,6,7,8,9月每个月的15日取样进行各渗透物质指标的测定。结果表明:叶片可溶性蛋白含量,D5处理比D4处理,在5,7,9月分别提高了16.58%,18.01%,16.08%;D4处理比对照,在5,7,9月分别提高了108.70%,43.41%,36.32%。叶片游离脯氨酸含量,6—9月D5处理分别比D4处理提高了11.41%,15.26%,14.17%,16.40%,D4处理分别比D2处理提高了16.11%,14.53%,18.66%,13.20%。叶片可溶性糖含量,5月D5处理比其他4个处理分别提高了87.74%,53.08%,37.24%,15.70%。叶片甜菜碱含量,8-9月D5处理分别比D4处理提高了4.50%,9.43%,D4处理比D3处理提高了2.87%,9.44%。综合分析认为,D5处理对提高紫丁香渗透物质含量效果显著优于其他根外追肥处理。

Effect of Topdressing on osmotic substance content of Syringa oblata Lindl.

The effects of topdressing of different nutrient elements on osmotic substance content in Syringa oblata Lindl. were studied in order to provide theoretical basis for selecting reasonable nutrient elements for the topdressing. The test was conducted under field conditions,five treatments were set up,including clear water control (D1),nitrogen (D2),nitrogen and phosphorus (D3),nitrogen,phosphorus and potassium (D4),nitrogen,phosphorus and potassium+trace elements (D5),repeating three times. The results showed that: the soluble protein content of D5 increased by 16.58%,18.01%,16.08% compared with D4 in May,July and September,and D4 increased by 108.70%,43.41% and 36.32% compared with the control;from June to September,the content of free proline in D5 increased by 11.41%,15.26%,14.17% and 16.40% compared with D4,and then D4 increased by 16.11%,14.53%,18.66%,13.20% compared with D2;the soluble sugar content of D5 increased by 87.74%,53.08%,37.24% and 15.70% compared with the other four treatments when in May;from August to September,the betaine content of D5 increased by 4.50% and 9.43%,D4 increased by 2.87% and 9.44% compared with D3. The comprehensive analysis showed that D5 was better than other topdressing treatments in improving the content of Syringa oblata Lindl. osmotic substances.