Foliar Application of Urea at the Flowering Stage Increases Cadmium Concentration in Wheat (Triticum aestivum L.) Grain

日本作物学会紀事

Naoyuki Ishikawa^1¹  Gen Ishioka^2² 

[1] Western Region Agricultural Research Center^1;Western Region Agricultural Research Center^2

关键词: Cadmium;    Foliar application;    Nitrogen;    Protein;    Topdressing;    Urea;    Wheat;   

DOI  :  10.1626/jcs.86.15

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The application of nitrogen fertilizer at the flowering stage is important to increase wheat protein concentration for improving the suitability for processing, especially for breadmaking. However, the application of nitrogen fertilizer is known to increase the cadmium (Cd) concentration in the grain because it increases Cd solubility in the soil through the acidification of the soil and the acceleration of ion exchange. This suggests that the grain Cd concentration may not be increased by the foliar application of urea. Therefore, we investigated the effects of soil- and foliar-application of urea at the flowering stage on the grain Cd concentration by pot and field experiments. Consequently, both soil- and foliar-application of urea increased the protein and Cd concentrations even when the pots were protected from rain and dropping of the urea solution. There was a positive correlation between grain protein concentration and grain Cd concentration. Urea application at the flowering stage delayed the senescence of the leaves and grain maturation, and in the pot experiment, it increased the thousand-grain weight, the grain yield, and the accumulation of Cd, K, Ca and Mg in the grain. It is speculated that nitrogen application increases the activity of plant and this leads to the increase of Cd uptake. The increase of grain protein concentration will inevitably lead to the increase of grain Cd concentration even if the foliar application of urea is adopted to increase the grain protein concentration.

【 授权许可】

CC BY