Determining critical values of soil Olsen-P for maize and winter wheat from long-term experiments in China

The critical value of soil Olsen-P is the point above which the probability of crop yield response to fertilizer P is small or nil. Determining this critical value is fundamental when making appropriate P fertilizer recommendations. In this study, the critical values were determined for continuous m...

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Bibliographic Details
Published in:Plant and soil 2009-10, Vol.323 (1-2), p.143-151
Main Authors: Tang, Xu, Ma, Yibing, Hao, Xiying, Li, Xiuying, Li, Jumei, Huang, Shaomin, Yang, Xueyun
Format: Article
Language:English
Subjects:
Agricultural site preparation
Agrology
Agronomy
Agronomy. Soil science and plant productions
Animal, plant and microbial ecology
Biological and medical sciences
Biomedical and Life Sciences
Clay loam soils
Corn
Critical value
Critical values
Crop science
Crop yield
Cropping systems
Ecology
Fertilizers
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
Life Sciences
Long-term
Olsen-P
Plant Physiology
Plant resources
Plant Sciences
Regular Article
Resource allocation
Soil science
Soil Science & Conservation
Soil water
Soil-plant relationships. Soil fertility
Soil-plant relationships. Soil fertility. Fertilization. Amendments
Soils
Wheat
Wheat soils
Winter
Winter wheat
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Summary:The critical value of soil Olsen-P is the point above which the probability of crop yield response to fertilizer P is small or nil. Determining this critical value is fundamental when making appropriate P fertilizer recommendations. In this study, the critical values were determined for continuous maize (Zea mays L.)-winter wheat (Triticum aestivum L.) cropping systems from a 15-year field experiment across three sites in China using linear-linear, linear-plateau and Mitscherlich models. The mean critical values for maize using the three models ranged from 12.1 to 17.3 mg P kg⁻¹ (average 15.3 mg P kg⁻¹) and for winter wheat from 12.5 to 19.0 mg P kg⁻¹ (average 16.3 mg P kg⁻¹) among study sites. The mean critical value for maize was approximately 7% lower than that for winter wheat across all sites based on the three models. Critical values identified by the Mitscherlich model were 1.4 to 2.1 times those from linear-linear and 1.3 to 1.9 times of those from linear-plateau and were crop and site dependent. There was a significant negative correlation (P 
ISSN:0032-079X
1573-5036
DOI:10.1007/s11104-009-9919-y