3. Nitrous trifluoride, or N-oxide, or salts useful in agriculture； useful intermediaries in their preparation； and the use of compounds to control phytotoxin fungi； a method of controlling phytotoxin-harmful fungi, in which process purchases 1. Effective treatment of fungi or plants, soils or seeds that wish to be protected from chemical attack with at least one compound or nitrous oxide or an agricultural acceptable salt； agricultural chemical composition includes at least one compound；There are also agricultural chemicals, including seeds. 1. Characteristic 1: Compounds (1) having formulaic properties.Or an acceptable positive oxide or salt in agriculture, in which a is a phenyl or an aromatic cycle of 5 or 6 members, in which, in addition to carbon atoms, the atoms in the aromatic ring also include those from A.n, O and s are cyclic atoms； where the phenyl ring or isoaromatic hydrocarbon cycle will not be replaced or replaced by one or two identical or different RA groups； in RA, halogen, cyanide, C833183267A-asphalt, C8321838383832626A-halogen tar, C83218383832683268C-Alcox or C8321833183318383268C-Halocalc； OXI； V ES-Nr2-Nr2-；I am - (c = o)- (c = s) - O-S (= o) 8346； -；P is 0, 1 or 2, W is R1,- No. 830909-R1 O-Nr2-NR83099-R1；A.R1 ES C8321； saturated bicycles, partially unsaturated or aromatic 3 to 10 m Atoms of rings, in addition to carbon atoms, include 1, 2, 3, or 4 heteroatoms selected from N, or S as ring atoms, of which 1 or 2 are heteroatoms or bicyclic rings. A. Can be replaced by one or two groups independent of - C (= O) - and - C (= S)；A. The heteromorphic group is C8321833183248324831-tar. The heteromorphic aromatic cycle consists of 5 to 6 members. Besides carbon atoms, the atoms in the heterocyclic ring include 1, 2, 3 or 4 heteromorphic atoms selected from N or heteromorphic atoms selected from N as atoms. (l) Rings, in which no one of the above-mentioned preparations or periodic groups can be replaced or replaced with the same or different R7491
