@article{
  author = {Barat Zadeh, Sara, Saki Nejad2*, Tayeb, Babaei Nejad, Teymour},
  title = {Effect of potassium nano-chelate and ascorbic acid on 
grain yield and some qualitative characteristics of cowpea 
(Vigna unguiculata L., Kamran cultivar)},
  journal = {Journal of Plant production Sciences},
  year = {2019},
  volume = {9},
  number = {2},
  pages = {149-160},
  doi = {}
}