期刊
AGRONOMY-BASEL
卷 12, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/agronomy12092149
关键词
ammonium; nitrate; critical pH; nitrogen recovery efficiency; nitrogen uptake
资金
- National Natural Science Foundation of China [42077101, 31672229, 42107342]
This study found that in acidic soils, maize generally prefers NO3-, while in neutral to alkaline soils, it prefers NH4+. The pH of the soil and nutrient solution is a key factor influencing maize's preference for NH4+ vs. NO3-.
To improve crop nitrogen recovery efficiency (NRE), plants must be supplied with their preferred form of nitrogen (N). However, whether pH affects crop N-form preference remains unclear. Here, we aimed to explore how maize (Zea mays L.) preference for NH4+ and NO3- is affected by pH and to determine the critical pH controlling this preference. Maize plants were grown with NH4+ or NO3- in different soils (pH 4.32-8.14) and nutrient solutions (pH 4.00-8.00). After harvest, plant dry weights, N content, N uptake, NRE, soil pH, and exchangeable aluminum (Al) were measured. Compared with the effect of NO3-, NH4+ decreased maize dry weight, N uptake, and NRE by 28-94% at soil pHs of 4.32 and 4.36 and a solution pH of 4.00, whereas it increased these parameters by 10-88% at soil pHs of 6.52-8.02 and solution pHs of 7.00 and 8.00. NO3- increased soil pH and decreased soil exchangeable Al content at soil pHs of 4.32-6.68. Critical soil and solution pHs for changing plant growth and N uptake preference for NH4+ vs. NO3- ranged from 5.08 to 5.40 and from 5.50 to 6.59, respectively. In conclusion, the preference of maize seedling growth and N uptake for NH4+ vs. NO3- mainly depends on the pH of the growth medium, and maize seedlings generally prefer NO3- in strongly acid soils but NH4+ in neutral to alkaline soils.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据