COMPARISON OF 5 SOIL TESTING METHODS TO ESTABLISH PHOSPHORUS SUFFICIENCY LEVELS IN SOIL FERTILIZED WITH WATER-SOLUBLE AND SPARINGLY SOLUBLE-P SOURCES

被引：25

作者：

BATIONO, A

BAETHGEN, WE

CHRISTIANSON, CB

MOKWUNYE, AU

机构：

[1] IFDC-Africa, Lomé

[2] The Sahelian Center of the International Crops Research Institute of the Semi-Arid Tropics, Niamey

[3] Agro-Economic Division, International Fertilizer Development Center (IFDC), Muscle Shoals, 35662, AL

[4] IFDC-Africa, Lomé

来源：

FERTILIZER RESEARCH | 1991年 / 28卷 / 03期

关键词：

BRAY-P1; BRAY-P2; MEHLICH-1; OLSEN; WATER-EXTRACTABLE-P; PHOSPHATE ROCK; PARTIALLY ACIDULATED PHOSPHATE ROCK; WEST AFRICA;

D O I：

10.1007/BF01054328

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

Field experiments were conducted in Niger with pearl millet (Pennisetum glaucum [L] R. Br.) in which the crop was fertilized with phosphate rock (PR) from two deposits from Niger (Tahoua and Parc W). The PR was applied either as ground rock or as partially acidulated phosphate rock (PAPR) and was compared to water soluble sources (TSP and SSP) in terms of millet yield response. The ability of five soil testing procedures (Bray P1, Bray P2, Mehlich 1, Olsen, and water extraction) to establish P sufficiency levels for millet was tested. The results of all soil testing methods were highly correlated amongst each other for the treatments receiving water-soluble fertilizers or PAPRs. None of the soil testing procedures which were evaluated was able to accurately measure available P when PRs were applied. Sufficiency levels were calculated for the PAPR and water-soluble fertilizers using nonlinear regression analysis and a graphic procedure for each of the P soil testing methods. The Bray P1 method appeared to be the most reliable procedure and was used to study the effect of accumulated total or total water + citrate-soluble P rates on final P availability. A single quadratic function was able to describe this effect when the P rates were expressed as water + citrate-soluble P for both PAPRs and water-soluble fertilizers independently of the P fertilizer source.

引用

页码：271 / 279

页数：9

共 20 条

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