Author : Tulin, Anabella B.

Summary : This paper presents various studies on the effects of macro- and micronutrient fertilization on the productivity (growth and yield), profitability, and quality of root crops such as purple yam (Dioscorea
alata) and sweetpotato (Ipomoea batatas),1 and vegetables such as tomato (Lycopersicon esculentum), pechay (Brassica napus), and cabbage (Brassica oleracea).

Most of the results presented here were taken from the findings of various research projects conducted by the author. Some of these projects were done in pot experiments (i.e., sweetpotato and pechay) and field experiments (i.e., purple yam, purple sweetpotato, cabbage, and tomato). The use of protected cultivation for tomato was also presented in comparison with the normal production in the open field. In all of the studies presented here, different combinations of macro- and micronutrients were used to determine the levels of nutrients that would enhance productivity, profitability, and quality.