nitrogen source
Shehata, S. A., S.F.EL-Sayed, and M.Alphonse,
"Effect of planting date,harvest time and nitrogen source of spinash (1) Growth and yield ",
Bull..Fac.of Agric. Univ. of Cairo,, vol. 1, pp. 123-138, 1990.
Shehata, S. A., S. F. EL-Sayed, and M. Alphonse,
" Effect of planting date, harvest time and nitrogen source of spinash (11) Chemical constituents",
Bull. Fac. of Agric. Univ.of Cairo,, vol. 1, pp. 73-88, 1990.
