No matter what the soil moisture treated, being with waterlog in normal paddy or upland condition in GCRPS field, once nitrate as nitrogen fertilizersource. N2O emission increased remarkably.
不论是旱种还是水田，只要增加硝态氮源，土壤n2o的排放就极显著增加。
2
Sink: source ratio could be affected by plant density or fertilizer supply level.
库源比既受肥料水平的影响，也受密度的影响。
3
Animal manures were the main source of organic fertilizer, but their application for farming lands were limited due to a lot of pathogens, parasite ova and toxicant contained.