河北省土壤硼的含量与分布

河北土壤全硼平均25.9ppm,变幅2—75ppm.用沸水5分钟提取的有效硼平均0.50ppm,变幅0.02—9.38ppm.全省61.8%的耕地有效硼在临界缺乏值(0.5ppm)以下,0.51—1.0ppm中硼耕地占32.5%,>1.0ppm高硼耕地仅占5.7%.土壤硼含量决定于成土母质.在成土过程中数量消长期与成土条件,土壤质地、有机质、碳酸钙、pH等有关.本文讨论了它们之间的数量关系.

Content and Distribution of Boron in Soils of Hebei Province

The level of total boron of soil in Hebei is 25.9 ppm in average and changes from 2 to 75 ppm . The content of available boron in soil extracted in boiling water in 5 minutes is 0.50 ppm in average and changes from 0.02 to 9.38 ppm. The avail-able boron content of soil in 61.8 % of cultivated land of this province is below the critical value ( 0.50 ppm). The boron content in 32.5 % of cultivated land is on the middle level ( 0.51 - 1.00 ppm). Only 5.7 % of cultivated land is rich in teron content ( > 1 ppm ) .The boron content in soil depends upon the parent materials of soil. Growth and decline of its content is related to the condition of soil development , soil texture, organic matter , CaCO3 and pH. The relationship between boron and these factors is discussed in this paper .