“Effects of blended polyvinyl alcohol/urea on the growth, yield and chemical content of tomato (Lycopersicon esculentum L. Mill): Effects of polyvinyl alcohol/urea blended on the growth of tomato”, IJBCh, vol. 13, no. 2, pp. 59–68, Dec. 2020, doi: 10.26577/ijbch.2020.v13.i2.08.