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Zeng, X., Peng, Y.. (1395). Stimulated fine root growth benefits maize nutrient uptake under optimized nitrogen management. , 11(1), 89-100. doi: 10.22069/ijpp.2017.3311
X. Zeng; Y. Peng. "Stimulated fine root growth benefits maize nutrient uptake under optimized nitrogen management". , 11, 1, 1395, 89-100. doi: 10.22069/ijpp.2017.3311
Zeng, X., Peng, Y.. (1395). 'Stimulated fine root growth benefits maize nutrient uptake under optimized nitrogen management', , 11(1), pp. 89-100. doi: 10.22069/ijpp.2017.3311
Zeng, X., Peng, Y.. Stimulated fine root growth benefits maize nutrient uptake under optimized nitrogen management. , 1395; 11(1): 89-100. doi: 10.22069/ijpp.2017.3311

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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