ABSTRACT

Silicon (Si) is the second most abundant element on the earth’s crust. Growth and defense responses of plants can be influenced by Si availability. To evaluate the effect of Si on lettuce growth and properties of its drainage water, two experiments were conducted. The first experiment was conducted in a factorial template with four different cultivars (”Romana,” “Angelֹ,” “Monocasa,” and “Primavera”) and three different light spectra including white, yellow, and white-red. Statistical analysis showed that cultivar and spectrum had a significant effect (P ≤ 0.01) on lettuce growth. Romana cultivar under white light with the highest fresh weight and lowest water use had the best performance among the treatments. The highest water use efficiency (WUE) was detected in Romana cultivar under white spectrum. The second experiment was performed using six different levels of Si (0, 1, 2, 3, 4, and 5 g/pot) on Romana cultivar under white spectrum (best treatments obtained from the first experiment) with seven replications. Si had positive effects on vegetative growth of lettuce plants. The highest biomass was obtained by application of 3 g/pot Si. Si significantly influenced all of the chemical characteristics of drainage water. Increase in pH was detected by an increase in the concentration of Si. By increasing Si concentration, EC and NO³⁻ levels were increased and K⁺ was decreased in the drainage water. In conclusion, it is observed that application of Si under white spectrum for Romana cultivar improves WUE and lettuce growth. Its application also influences the chemical properties of drainage water.

摘要

硅（Si）是地壳中含量第二高的元素。硅的有效性会影响植物的生长和防御反应。为了评估硅对生菜生长及其排水性能的影响，进行了两个实验。第一个实验是在阶乘模板中进行的，阶乘模板具有四个不同的品种（“罗马尼亚”，“天使”，“莫诺卡萨”和“ Primavera”）和三个不同的光谱，包括白色，黄色和白色-红色。统计分析表明，品种和光谱具有显着的影响（P≤0.01）。在白光下具有最高鲜重和最低耗水量的罗曼那品种在所有处理中表现最佳。在白色光谱下，罗马娜品种的水分利用效率（WUE）最高。第二个实验是在白色光谱下，在罗马娜品种上使用六种不同水平的Si（0、1、2、3、4和5 g /罐）进行的（从第一个实验获得的最佳处理），重复七次。Si对莴苣植物的营养生长具有积极作用。通过施用3 g /罐Si可获得最高的生物量。硅显着影响了排水的所有化学特性。通过增加Si的浓度来检测pH的增加。通过增加Si浓度，EC和NO ³⁻含量增加，K排水中的⁺减少了。总之，观察到在白色光谱下将Si施用于罗马甘菊品种可以提高WUE和生菜的生长。它的应用也会影响排水的化学性质。