施钾对桑树生长和吸钾特性的影响

Effects of potassium applying on growth and K uptaking of mulberry trees

利用土壤养分状况系统研究法,对广西桑园土壤养分状况特别是钾素养分进行了评价;进行4个钾肥水平大田试验,研究钾肥对桑树生长、桑叶产量和钾素吸收的影响。结果表明,土壤中钾是桑树主要的养分限制因子之一,在一定氮、磷肥施用基础上,施钾促进桑树生长如枝条长度和粗度增加并提高桑叶产量。此外,施钾还提高桑树对钾素的吸收利用,以K2处理(148.5kg K2O/hm2)的施钾效果最好;与不施K处理相比,枝条长度、枝条粗度、桑叶产量分别增加7.78cm、0.07cm和27.73%。本试验条件下,桑园钾肥适宜用量为148.5kg/hm2。

A study was conducted to evaluate the soil nutrient status especial for the K nutrient of mulberry trees planting area in Guangxi using soil nutrient systematic approach,and the field experiment with four levels of K were carried out to study the effects of K fertilizer on mulberry growth, yield and K uptaking characteristics. The results showed that soil K was one of the main limiting factors of nutrient on mulberry in planting area. Based on applying N and P fertilizers,the treatments with potassium fertilizer could increase the yield of mulberry leaf and the absorption of K in mulberry, and the effects of K2treatments with 148.5kg K2O/hm^2 was the highest. As compared with the control, the mulberry branches length and width, and the mulberry yield increased by 7.78cm, 0. 07cm and 27. 73%, respectively. Therefore, in the experiment, the suitable dosage of K application in mulberry garden was 148.5 kg/hm^2.