氮素形态和不同pH值对金脉单药花生长的影响

Growth of Aphelandra squarrosa as affected by N-form and nutrient solution pH

在pH 4.4、5.7、7.0的水培条件下,分别供应NO3--N、NH4+-N和NH4NO33种不同形态的氮源,研究不同形态氮素和pH值对金脉单药花(Aphelandra squarrosa)生长的影响。结果表明:金脉单药花供给NH4NO3时叶面积、生物量最大,仅供NH4+-N时叶面积、生物量最小,且叶面积与生物量呈极显著正相关;在供给NO3--N时开花率最小,供给NH4+-N时开花率最大;当营养液pH 4.4和5.7时,氮素形态对金脉单药花生长产生一定影响,表现出叶面积、生物量均为NH4NO3>NO3--N>NH4+-N;pH 7.0时,虽然施用不同的氮肥会对其生长产生一定的影响,但差异并不显著。

The experiment was conducted under controlled hydroponics to investigate the growth of Aphelandra squarrosa as influenced by N-Form （NO3^ -N, NH4^＋ - N and NH4NO3） and nutrient solution pH （4.4, 5.7 and 7.0）. The results indicated that the leaf area of Aphelandra squarrosa and biomass were highest when NH4NO3 was the N source. While utilizing NH4^＋ - N as the sole N source they were lowest. Besides, there was a significantly linear relationship between leaf area and biomass. The flowering rate of Aphelandra squarrosa was obviously increased when NH4^＋ - N as the sole source. When solution pH was 4.4 or 5.7, the growth of plant was affected by N-form in a degree. When solution pH was 7.0, the effect of N-form on the growth of plant was not significant.