Journal
FIELD CROPS RESEARCH
Volume 131, Issue -, Pages 9-16Publisher
ELSEVIER
DOI: 10.1016/j.fcr.2012.03.003
Keywords
Rhizosphere; Root length density; Nutrient uptake; Extracted mineral N; Olsen-P; NH4OAc extracted K; Nutrient depletion in rhizosphere; Zea mays
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Funding
- National Basic Research Program (973 Program) of China [2007CB109302]
- National Natural Science Foundation of China [30890131]
- National Science Foundation of China [31121062]
- Chinese Universities Scientific Fund
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There have been many studies to examine macronutrient depletion in the rhizosphere under controlled conditions. However, most cereal plants are grown in the field, which requires thorough investigation for nutrient use efficiency and crop yield. A two-year field study was conducted to investigate temporal dynamics of available nitrogen (N), phosphorous (P), and potassium (K) in the rhizosphere and bulk soil of maize, and changes in root length density (RLD) and soil NPK concentrations in 0-60 cm soil profile. The rhizospheric soil was collected by shaking the tightly attached soil after carefully removing the loosely held soil from the roots. During the vegetative growth stage, the RLD changed corresponding to shoot demand for nutrients. Maize plants accumulated NPK asynchronously during the whole growth period. More than 92% of total K was taken up during the vegetative growth stage, while approximately 65% of N and 55% of P were absorbed at the same time. There was significant N depletion in maize rhizosphere along soil profiles at each harvest: however, P or K depletion in maize rhizosphere could not be determined. Consistent with the obvious net K loss from maize plants in late reproductive growth stage, there was a significant K increase in the rhizosphere. These results indicated differential utilization strategies and accumulation patterns of mineral nutrients such as N, P. and K nutrients in the plant-soil rhizospheric system, laying a theoretical base for optimized fertilization practice. (C) 2012 Elsevier B.V. All rights reserved.
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