Preliminary Study on Abundance and Deficiency Index of Iron,Manganese and Zinc for Alfalfa Soil in Bashang Area

The abundance and deficiency index of iron,manganese,and zinc for Alfalfa soil in Bashang area were studied by pot experiment.The results showed that planted alfalfa in Bashang area,its abundance and deficiency index of nutrient:when its value was less than 4.9 mg/kg,available iron of soil was less deficient;when its value was from 4.9～ 15.1 mg/kg,available iron of soil was deficient;when its value was from 15.1～35.3 mg/kg,available iron of soil was in middle degree;when its value was from 35.3～46.9 mg/kg,available iron of soil was abundant;when its value was more than 46.9 mg/kg,available iron of soil was greatly abundant.when its value was less than 3.3 mg/kg,available manganese of soil was less deficient;when its value was from 3.3～13.1 mg/kg,available manganese of soil was deficient;when its value was from 13.1～36.9 mg/kg,available manganese of soil was in middle degree;when its value was from 36.9～52.0 mg/kg,available manganese of soil was abundant;when its value was more than 52.0 mg/kg,available manganese of soil was greatly abundant.when its value was less than 0.4 mg/kg,available zinc of soil was less deficient;when its value was from 0.4～1.2 mg/kg,available zinc of soil was deficient;when its value was from 1.2～2.9 mg/kg,available zinc of soil was in middle degree;when its value was from 2.9～3.9 mg/kg,available zinc of soil was abundant;when its value was more than 3.9 mg/kg,available zinc of soil was greatly abundant.