کلمات کلیدی مربوط به کتاب کارایی مصرف خاک و کود فسفر: کشاورزی، شیمی کشاورزی و علوم خاک
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توجه داشته باشید کتاب کارایی مصرف خاک و کود فسفر نسخه زبان اصلی می باشد و کتاب ترجمه شده به فارسی نمی باشد. وبسایت اینترنشنال لایبرری ارائه دهنده کتاب های زبان اصلی می باشد و هیچ گونه کتاب ترجمه شده یا نوشته شده به فارسی را ارائه نمی دهد.
Rome: Food and Agriculture Organization of the United Nations,
2008. — 108 pp. — (FAO Fertilizer and Plant Nutrition Bulletin
18).
ISBN 978-92-5-105929-6.
The efficient use of phosphorus (P)
is essential to many agricultural and environmental issues.
These include maintaining or improving the P fertility of soils
by the judicious use of P fertilizers and other sources of P,
such as organic manures including animal manures, composts and
biosolids. There is also the need to conserve the finite global
P resource. This bulletin reviews, analyses and synthesizes
information on the efficient use of soil and fertilizer P. It
presents information on the plant availability of soil and
fertilizer P, with an emphasis on soil plant interactions. The
focus is on the changing concepts of the behaviour of both soil
and fertilizer P and on the need to define and assess their
recovery and, thus, P-use efficiency more appropriately. The
bulletin also outlines strategies for improving P-use
efficiency. Strategies for improving the efficiency of use of
soil and fertilizer P include: (i) modifying surface soil
properties; (ii) managing surface soil; (iii) managing P
sources; and (iv) optimizing P use through economically
appropriate rates and timing. The main conclusion of this
bulletin is that the efficiency of fertilizer P use is often
high when evaluated over an adequate time scale using the
balance method.
C o n t e n t
s.
Acknowledgements.
List of acronyms and abbreviations.
Executive summary.
Introduction.
Rationale for the report.
Background.
Plant availability of soil and fertilizer
phosphorus.
Soil–plant interactions.
Concentration of phosphorus in the soil solution.
Movement of phosphorus to roots.
Plant root systems and phosphorus uptake by roots.
Phosphorus uptake, root systems and soil conditions.
Changing concepts of the behaviour of soil and
fertilizer phosphorus and reconciling these with agronomic
information.
Work in the nineteenth century.
Work in the early part of the twentieth century.
From 1950 to 1980: a period of change.
A major change in direction.
An overall assessment.
Reconciling current concepts with agronomic
information.
Measuring the recovery of soil and fertilizer phosphorus and
defining phosphorus-use efficiency.
Introduction.
Assessing the recovery of added phosphorus from crop
yields.
Efficiency determined in relation to yield per kilogram of
phosphorus applied or taken up by the crop.
Summary of methods for estimating the recovery of phosphorus
fertilizers.
Soil analysis.
Using omission plots to assess the need for phosphorus.
Summary.
Improving the efficiency of soil and fertilizer phosphorus use
in agriculture.
Modifying surface soil properties.
Managing surface soil and its phosphorus content.
Managing phosphorus sources
Investment to optimize soil phosphorus status and
availability.
Conclusions.
References.
Annex. Case studies.