| | 2020/4/27 | | | | 2018 7 1 | GB/T2440 2017 | | GB2440 2017 | N % | N 45% | 45% | | | N 45% | 46.3% | | GB/T2440 2017 | 25% | GB/T2946 2008 | | 控矢尿素 矢 | 控释 控失 | 矢量图 矢 | | | | | | GB10205-2009 | N-P2O5-K2O | 53% | | 1. N | P2O5 | | | 2. | K2O 0 | | 3. GB10205 2009 | | | | GB10205-2009 | | | SCM K2O | | | GB15063 | -2009 N+P2O5+K2O | K2O | 25% | | | 1 100 | 3 5 | | | | | HAK K2O | | 1 20 | | | | | | | | | | | |