一、需肥特点菜豆根系比较发达,要求生长在疏松肥沃、排水和透气性良好的土壤中。菜豆耐盐碱的能力较差,尤其不耐含氯离子的盐类。菜豆出苗后,根系可迅速从土壤中吸收各种营养元素。随着植株的生长,养分的吸收量逐渐增大,到了开花结果时,养分积累达到最大值。菜豆一生中从土壤吸收最多的营养元素是钾,其次是氮、磷、钙、硼 First, the characteristics of fertilizer Need bean root more developed, requires growth in loose fertile, well-drained and breathable soil. Beans are less able to tolerate salts and alkalis, especially those with chloride ions. After the emergence of beans, the root system can quickly absorb a variety of nutrients from the soil. With the growth of plants, nutrient uptake gradually increased, to the flowering results, nutrient accumulation reached its maximum. Beans beans from the soil during life uptake of nutrients is the most potassium, followed by nitrogen, phosphorus, calcium, boron