黔中地区实地氮肥管理对水稻产量、干物质积累量及氮肥利用率的影响

为了合理的控制氮肥施用时期及施用比例，以‘Q优麻恢1号’为材料，对黔中地区实地氮肥管理方式对水稻产量与干物质积累以及氮肥利用率的影响进行研究。结果表明，水稻叶片的SPAD值与LCC值之间存在极显著的正相关关系，初步确定试验区的SPAD阈值为36~40，LCC值为3.2~3.5。在施氮量相同的情况下，实地氮肥管理能够有效的提高产量5.2%，干物质积累量未达到显著性差异。与农民习惯施肥相比，实地氮肥管理的氮肥吸收利用率能提高42.0%~144.4%。实地氮肥管理技术有利于合理的控制氮肥的施用时期和施氮量，在实际水稻生产中有较大的应用价值。

Effects of Site-specific Nitrogen Management on Yield and Dry Matter Accumulation and Fertilizer-N Use Efficiency of Rice in the Central Areas of Guizhou Province

In order to control N fertilizer application period and N application rates reasonably,the effect of site-specific nitrogen management(SSNM) on yield and dry matter accumulation and fertillizer-N use efficiency with rice cultivar ' Qyoumahui 1 ' was studied in this article in the central areas of Guizhou Province.The results showed that the SPAD value and LCC value had extremely significant positive correlation,36-40 was considered as the critical SPAD value,and 3.2-3.5 was the critical LCC value for N appl...