Studies on nutrition diagnosis, fertilization and environmental effects in non-polluted vegetable production were conducted in the field and pot experiments In Beijing suburb. The results were summarized as follows:
1. It was found that only a few kinds of mineral fertilizers were input in unreasonable proportion of nutrient supply. The mineral fertilizers of N and P were mainly urea and diammonium orthophosphate, whereas a few potassium. The varieties of organic manures tended to be r...