Effect of cucumber stock on growth and propagation of Meloidogyneincognita and its relation with root exudates Effects of Arabisalpina L. var. parviflora Franch and Zea mays L. intercropping system on root-exudated organic acids under lead stress Effects of faba bean (Vicia faba L.) root exudate on soil available nutrients and microbial population in different purple soils Identification and autotoxicity of root exudates of continuous cropping potato at different growth stages