Biological Agriculture & Horticulture, Volume 7A B Academic Publishers, 1990 - Agriculture |
Other editions - View all
Common terms and phrases
acid activity adult Agriculture analysis animals aphid applied associated bean biological carrot chapter chemical collected composts considered cover crops dates densities determined ecological effects emergence environmental experiment factors farm farmers fertility field Figure flower given grown growth hairy vetch higher Horticulture host important included increase indicated influence insects interest International ISBN Journal legumes less levels London manure March material mean methods mineralization moon natural nitrogen nutrient observed organic organic matter parasitoid Peat period pesticides pests phosphorus plants plots population practices present problems production protected publication Publishers range ratio reduced References relationship relatively response rhythms root sampling Science seed showed significant Society soil species spores sustainable Table treatment tropical University values vegetables vetch weed winter yield