Abstract
A research was made to see how organic fertilizers affected the reducing sugar, orgnic acid andvitamin C contents of Saturn type tomato fruits.
The tomato plants were cultured with the following two types of fertilizers respectively, 1) organic fertilizers with bone meal and rapeseed meal and 2) inorganic fertilizers with chemical fertilizers. The fruits were harvested at fully ripened stage (or expressed as red stage).
1) In 1980, fruits with organic fertilizers contained more reducing sugar and vitamin C than those with inorganic fertilizers.
2) In 1981, organic fertilized fruits contained more vitamin C.
3) In 1982, little difference was detected. However, the components of inorganic fertilized fruits differed remarkably at every cluster, on the other hand organic fertilized fruits were relatively constant.
4) Both fruits grown at the upper cluster contained less water but more reducing sugar and vitamin C than those of under cluster.
