Modelling long-term phosphorus leaching and changes in phosphorus fertility in excessively fertilized acid sandy soils

被引:71
|
作者
Del Campillo, MC
Van der Zee, SEATM
Torrent, J
机构
[1] Univ Cordoba, Dept Ciencias & Recursos Agr & Forestales, Cordoba 14080, Spain
[2] Wageningen Univ Agr, Dept Environm Sci, Oil Pollut & Soil Protect Grp, NL-6700 EC Wageningen, Netherlands
关键词
D O I
10.1046/j.1365-2389.1999.00244.x
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
The sound management of agricultural soils that are heavily loaded with phosphorus (P) involves minimizing the losses of P responsible for eutrophication of surface waters, while ensuring enough P for crops. This paper describes a simple model to examine the compatibility of these two objectives in acid sandy soils in a temperate humid climate. The model is based on several assumptions regarding reversible and irreversible P sorption by P-reactive soil compounds (mainly poorly crystalline Fe and Al oxides) and release of P to water (water-P test). Model inputs are amount of P leached, P uptake by crops, and contents of poorly crystalline Fe and Al oxides in soil. The model predicts that reducing the amount of leached P to what is environmentally acceptable (e.g. 0.44 kg P ha(-1) year(-1), equivalent to 1 kg P2O5 ha(-1) year(-1)) results in the long run in available soil P test values below target concentrations for optimum crop growth. When the amount of leached P is set to a fixed value the model predicts that soils with large contents of Fe and Al oxides can maintain the initial soil P test values for longer periods than other soils. The content in available P decreases if fertilizer P is applied to the soil at a rate equal to P uptake by crops. These results stress the difficulties involved in trying to make agricultural and environmental needs compatible in acid sandy soils.
引用
收藏
页码:391 / 399
页数:9
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