Fig. 4From: Nitrous oxide emission from wetland soil following single and seasonal split application of cattle manure to field tomato (Lycopersicon esculentum, Mill var. Heinz) and rape (Brassica napus, L. var. Giant) cropsNO3-N concentration in wetland soil follow ing single and split application of manure. app application. a First tomato crop, b first rape crop, c second tomato crop and d second rape cropBack to article page