Distribution of phosphorus fractions in a Brazilian Oxisol under different tillage systems

79Citations
Citations of this article
57Readers
Mendeley users who have this article in their library.
Get full text

Abstract

Changes in residue management resulting from adoption of conservation tillage systems have the potential to alter the concentration and distribution of phosphorus (P) in the soil surface. The objective of this study was to determine the effect of methods of tillage management on the distribution and concentration of organic and inorganic forms of soil P near the soil surface (0-10 cm depth) for an Oxisol in southern Brazil. The tillage systems included zero tillage (ZT) (seeding directly onto the standing stubble of the previous crop), minimum tillage (MT) (seeding the crop after chisel plowing to 15-cm depth and disk harrowing to 7.5 cm), or conventional tillage (CT) (seeding after disk plowing to 20-cm depth with nearly total soil inversion plus two disk harrowings to 10-cm depth). After a period of five years, reducing tillage through adoption of MT or ZT practices increased total P in the surface 10 cm by 15% when compared to CT. Although there were no differences in amounts of total P between MT and ZT systems, under ZT management larger amounts of labile organic and inorganic forms of P accumulated close to the soil surface, followed by a reduction below the 6-cm depth. Under MT, the labile organic and inorganic forms of P were uniformly distributed within the surface 10 cm of soil. The accumulation of high levels of labile P near the soil surface under ZT followed a distribution pattern similar to the accumulation of organic residues in the soil. This would help explain why other workers have found increased P uptake by crops grown under ZT, and why more available P can be extracted by common soil testing methods from the surface 7 to 10 cm of soils under ZT than under CT management.

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Cite

CITATION STYLE

APA

Selles, F., Kochhann, R. A., Denardin, J. E., Zentner, R. P., & Faganello, A. (1997). Distribution of phosphorus fractions in a Brazilian Oxisol under different tillage systems. Soil and Tillage Research, 44(1–2), 23–34. https://doi.org/10.1016/S0167-1987(97)00026-3

Readers over time

‘10‘11‘12‘13‘14‘15‘16‘17‘18‘19‘20‘21‘22‘23‘24036912

Readers' Seniority

Tooltip

PhD / Post grad / Masters / Doc 25

64%

Researcher 8

21%

Professor / Associate Prof. 4

10%

Lecturer / Post doc 2

5%

Readers' Discipline

Tooltip

Agricultural and Biological Sciences 30

65%

Environmental Science 8

17%

Earth and Planetary Sciences 7

15%

Social Sciences 1

2%

Save time finding and organizing research with Mendeley

Sign up for free
0