莴苣“2+X”氮肥总量控制田间试验研究

Experiment on “2+X” Total Nitrogen Control in Field of Lettuce

通过开展"2+X"氮肥总量控制田间试验,进一步优化当地莴苣施肥技术。结果表明,试验所采用的莴苣配方施肥方案每667m2 N 23kg、P2O511.44kg、K2O 20.70kg,比涵江区当地习惯施肥具有极显著的增产效应。本试验条件下,莴苣产量随着氮肥施用量的增加先增加后减少,每66 7m2施氮量为25.40kg时,莴苣产量最高,每667m2氮肥最佳经济用量为25.03kg。

The field fertilization experiment of＂2＋X＂total nitrogen fertilizer control was carried out to further optimize the local fertilization techniques for lettuce.The results showed that the formula fertilization scheme per 667 m2 of N 23 kg、P2 O511.44 kg and K2 O 20.70 kg for lettuce used in this experiment had an extremely significant effect in yield increase compared with the local customary fertilization.Under the conditions of this experiment,the yield of lettuce increased first and then decreased with the increase of nitrogen application rate.When the nitrogen application rate was 25.40 kg,the yield of lettuce was the highest,and the optimal economic fertilizer application rate was25.03 kg.