论文部分内容阅读
采用根部输硫酸亚铁、柠檬酸铁、ＥＤＴＡ铁、根际施硫酸亚铁和自制专用肥的方法对苹果黄叶病进行矫正。结果表明：各种补铁措施均可提高叶片中活性铁及叶绿素含量，使黄叶病树病梢率和失绿级数下降。与对照比较，根际施硫酸亚铁效果差。各输液处理间没有明显差异，表现叶片复绿较快，但肥效持续时间短，操作困难，输用浓度为０．０２７ｍｏｌ· Ｌ－１铁液，果树幼嫩叶片有轻度卷曲的受害症状。自制专用肥效果最好，经一年春、秋２次施用，病梢率下降 ７０％～８０％，失绿下降 ２级，使中度缺铁黄叶病树完全复绿，黄叶病 ２ａ内未见复发。研究还表明，叶片中活性铁与叶绿素含量呈显著直线正相关。叶片中活性铁含量可较好反映树体铁营养状况。
Using the method of root ferrous sulfate, ferric citrate, iron EDTA, ferrous sulfate and homemade fertilizer, rhizosphere correction of apple yellow leaf disease. The results showed that all kinds of iron supplementation could increase the content of active iron and chlorophyll, and decrease the leaf shoot rate and the number of chlorophyll-a. Compared with the control, the effect of ferrous sulfate was poor. There were no significant differences among the treatments. The results showed that the leaf rejuvenation was faster, but the duration of fertilizer was short and the operation was difficult. When the concentration was 0.027mol · L-1, the young leaves of the fruit tree suffered slight crippling symptoms. Self-made special fertilizer best, after a year of spring and autumn 2 times application, the shoot rate decreased 70% to 80%, loss of green decreased 2, the moderate iron deficiency leaf tree completely green, yellow leaf disease 2a No recurrence. The study also showed that there was a significant linear positive correlation between active iron and chlorophyll content in leaves. Active iron content in leaves can better reflect the status of tree iron nutrition.