SULPHUR COATED UREA, CASEIN AND OTHER SLOW RELEASE NITROGEN FERTILIZERS FOR TOMATO PRODUCTION
Sulphur coated urea (SCU) when produced commercially would be only slightly more expensive than conventional fertilizers (Rindt et al., 1968). Rennet Casein, a by product of the creamery industry was freely available in 1969 when there was a butter surplus in Europe and was evaluated as a cheap source of nitrogen. This experiment reports the release characteristics of these fertilizers and their performance for tomatoes under glass using different methods of application. Certain other slow release fertilizers were included for comparative purposes. An earlier paper (Prasad, 1971) deals with some of these fertilizers for tomato propagation.