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Stimulated fine root growth benefits maize nutrient uptake under optimized nitrogen management | ||
International Journal of Plant Production | ||
مقاله 7، دوره 11، شماره 1، فروردین 2017، صفحه 89-100 اصل مقاله (1.05 M) | ||
نوع مقاله: Research Paper | ||
شناسه دیجیتال (DOI): 10.22069/ijpp.2017.3311 | ||
نویسندگان | ||
X. Zeng1؛ Y. Peng* 2 | ||
1Institute of Protected Agriculture, Chinese Academy of Agricultural Engineering, Beijing 100125, China | ||
2Key Laboratory of Plant-Soil Interactions, MOE, Center for Resources, Environment and Food Security, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China. | ||
چکیده | ||
Optimized nitrogen (N) management reduces total N application without sacrificing crop yield. However, the underlining mechanisms have not been well investigated, especially lacking the evidence from roots. Here we performed a two-year field experiment with maize grown under zero-N, conventional N and optimized N applications and examined grain yield, N, phosphorous (P) and potassium (K) uptake and root length in diverse diameter classes. Results showed that both conventional N and optimized N managements significantly increased plant nutrient contents and grain yield compared with zero-N treatment, but no obvious difference was observed between the two N-fertilized treatments. Notably, the response of different nutrients to N application was not synchronous temporally over the growth period, following the order of N first, P second and K last. Though N application generally had minor impact on total root length and root biomass, optimized N regime significantly increased fine root (diameter ≤ 0.2 mm) length compared with conventional N at the eighth leaf emerged stage. The stimulated fine root growth under optimized N management is beneficial for adequate N uptake during the key growth stage, which determines subsequent PK acquisition and final crop yield. Our findings highlight the importance of fine roots in maize NPK uptake and a better understanding of the response of fine roots to changes in N availability may therefore be critical for optimizing N input in maize farming system | ||
کلیدواژهها | ||
Root length؛ Phosphorous (P)؛ Potassium (K)؛ Leaf area؛ Grain yield؛ Zea mays L | ||
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