citation
Shukla, Arvind K; M.A. Khan, N.C. Upadhayay, B.P. Singh, S.S. Lal; S.K. Pandey, 'Chlorophyll meter : A tool for assessing dynamic nitrogen supply in potato under organic vis-d-vis inorganic nutrient management option', Potato Journal, vol. 34, 95-96, 2007