多年多点试验研究表明:河西走廊春小麦100 kg 籽粒吸N量为2.964 kg,吸P量为0.4177 kg;N、P化肥利用率分别为39.8% 和10.0% ;土壤供N率57.0% ,供P率83.3% ;春小麦农艺配方m (N)∶m (P2O5)= 1∶0.5为宜。
Years of multi-point experimental study s
In recent years the high efficiency of small and light weight electronic devices has been progressing and the multilayer printed wiring board in connection with