• Many fruit and vegetable varieties listed by the US Department of Agriculture in 1903 are now extinct.

• Although the same kind of vegetable cultivation was carried out, the groundwater under greenhouse fields in the paddy soil region contained less NO3-N than that in the upland sandy soil region.

• Arancon et al. (2007) observed a significant reduction in the populations of spider mites (Tetranychus urticae), mealy bugs (Pseudococcus sp.) and aphids (Myzus persicae) after the addition of food waste vermicompost to several vegetable crops (tomatoes, cucumber, cabbage, bush beans and eggplants).