D.E.A. de PEDOLOGIE (Science des Sols)

90
UNIVERSITE PIERRE ET t'lARIE CURIE (PARIS VI) UNIVERSITE NANCY 1 INSTITUT NATIONAL AGRONOMIQUE PARIS-G RIGNON UNIVERSITE DE FRANCHE-COMTE ECOLE NATIONALE SUPERIEURE AGRONOMIQUE DE RENNES D.E.A. de PEDOLOGIE (Science des Sols) Jean de Dieu N'ZI LA ÉTUDE EXPÉRIMENTALE DE L'EFFET DES AMENDEMENTS CALCIQUES SUR UN SOL FERRALLITIQUE ACIDE DE LA VALLÉE DU NIARI (CONGO) Septembre 1986 Laboratoires des Formations Superficielles ORSTOM - Centre de Bondy 70-74, route d'Aulnay 93140 BONDY

Transcript of D.E.A. de PEDOLOGIE (Science des Sols)

Page 1: D.E.A. de PEDOLOGIE (Science des Sols)

UNIVERSITE PIERRE ET t'lARIE CURIE(PARIS VI)

UNIVERSITE NANCY 1

INSTITUT NATIONAL AGRONOMIQUEPARIS-G RIGNON

UNIVERSITE DE FRANCHE-COMTE

ECOLE NATIONALE SUPERIEUREAGRONOMIQUE DE RENNES

D.E.A.de PEDOLOGIE

(Science des Sols)

Jean de Dieu N'ZI LA

ÉTUDE EXPÉRIMENTALEDE L'EFFET DES AMENDEMENTS CALCIQUES

SUR UN SOL FERRALLITIQUE ACIDEDE LA VALLÉE DU NIARI (CONGO)

Septembre 1986

Laboratoires des Formations Superficielles

ORSTOM - Centre de Bondy

70-74, route d'Aulnay

93140 BONDY

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REM E Rel E MEN T S

Je remercie infiniment Monsieur Roland MOREAU qui m'a

beaucoup conseillé, aidé et soutenu dans ce travail . Que Mon­

sieur MOREAU trouve ici l'expression de ma plus grande reconnais-

sance .

Mes remerciements vont également à l'égard de Monsieur

Gérard BELLIER qui a beaucoup participé pour la mise en route

de l'expérience et qui m'a aidé dans les diverses opérations

techniques •

J'adresse mes sincères remerciements à Monsieur

Paul DE BOISSEZON pour l'aide, si précieuse, qu'il m'a apportée

et aussi pour l'attention qu'il a accordé à mon travàil.

Je remercie sincèrement Monsieur Pierre PELLOUX pour

l'accueil qu'il m'a réservé dans son laboratoire et pour tous

les services qu'il m'a rendu.

Enfin, mes remerciements sont adressés à toutes les tech­

niciennes et tous les techniciens des laboratoires spécialisés de:

Dynamique des Ions et Physique du Sol, Matière Organique, Spectro­

chimie et Minéralogie qui m'ont beaucoup aidé dans l'élaboration

de ce travail .

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ABSTRACT

Due to its geographical situation and to the environmen­

tal conditions,the Niari valley shows favourable agronomic poten­

tialities. The highly unsaturated ferrallitic soils are favoura­

ble to the development of mechanization but, due to the intensive

cultivation, they are subject to an increased acidification along

with an increase in the exchangeable aluminium and manganese con­

tents which lead to aluminium and manganese toxicities. In order

to cope with this phenomenon, calcic improvements are made but

their use in the field has been badly defined.

This study conducted in the laboratory aims at obser­

ving the effect of these improvements and the resulting modifica­

tions in the soil characteristics. We also compared the influen­

ce exerted by the crushed limestone to that of lime and we obser­

ved the effect of the fresh plant matter on limestone.

Sorne evaluations have been made concerning the major

compounds (Ca, Mg, K) as well as aluminium and manganese. The

effect exerted by the improvements is positive, but the rate

of reaction and the intensity of the phenomenon are not similar

for each improvement. Thus, the crushed limestone leads to an

increase in the soil pH and in the rate of the soil exchangeable

bases. This increase in the soil pH leads to a considerable de­

crease in the exchangeable aluminium contents. The exchangeable

manganese first decreases and then it increases with time, whi­

le the easily reducible manganese decreases with time. The plant

matter associated with the crushed limestone makes the effect

of the latter more rapid. But the base and the mettallic cation

(Al, Mn, Fe) leaching is more important in the soil + limestone

+ plant matter treatment. The reaction of lime with soil is ra­

pid and a high increase in pH and exchangeable bases is observed

as well as a decrease in the exchangeable aluminium contents as

related to the test compounds. As was observed with the crushed

limestone, the exchangeable manganese first decreases with lime,

then it increases and the easily reducible manganese al\lays de­

creases. As compared to the L ~shed limestone, the baseSleaching

is more considerable in the case of lime. The action of lime is

instantaneous and rapid, while that of limestone is more gradual

mainly as far as the exchangeable bases are concerned.

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RES UME

De part sa situation géographique et les conditions du

milieu, la vallée du NIARI est une région qui présente de bonnes

potentialités agronomiques. Les sols ferrallitiques'fortement

désauurés sont favorables au développement de la mécanisation

mais subissent, sous l'effet des cultures intensives, une acidi­

fication accrue s'accompagnant d'une augmentation des teneurs en

Aluminium et Manganèse échangeables qui provoquent des toxicités

Aluminique et Manganique. Pour y remédier, on apporte des amen­

dements calciques dont les normes d'utilisation sur le terrain

ont été mal définies .

Le but de cette étude, réalisée en laboratoire, est ainsi

d'observer le mode d'action des amendements et les modifications

des caractéristiques du sol dus à l'apport de ces amendements.

Nous avons aussi comparer l'action du Calcaire broyé à celle de

la Chaux et on a vu l'effet de la matière végétale firaiche sur

l'action du Calcaire.

Des bilans ont été faits pour leg éléments majeurs (Ca,

Mg, K) et pour l'Aluminium et le Manganèse. L'effet des amende­

ments est positif mais la vitesse de réaction et l'intensité du

phénomène ne sont pas les mêmes pour chaque amendement . Ainsi,

le Calcaire broyé favorise une augmentation du pH du sol et une

augmentation des taux des bases échangeables dans le sol . Cette

remontée du pH dans le sol contribue à une baisse considérable

des teneurs en Aluminium échangeable . Le Manganèse échangeable

diminue au départ et ensuite croît avec le temps alors que le

Manganèse facilement réductible décroît avec le temps . La matière

végétale, associée au Calcaire broyé active l'effet de celui-ci.

Mais le lessivage des bases et des cations métalliques (Al,Mn,Fe)

est plus important dans le traitement sol + Calcaire + Matière

végétale. La Chaux réagit rapidement avec le sol et l'on note

aussi une forte augmentation du pH et des bases échangea~'-~

et une réduction des teneurs en Aluminium échangeable par rapport

aux ténloins . Comme le Calcaire.broyé, la Chaux réduit le Manga­

nèse échangeable au départ et il augmente par la suite, le Man­

ganèse facilement réductible étant toujours en décroissance . Par

rapport au Calcaire broyé, le lessivage des bases est plus im­

portant dans le cas de la Chaux. L'action de la Chaux est immé­

diate et rapide alors que celle du Calcaire est plus progressive

au cours du temps, surtout en ce qui concerne les bases êchangea­bles .

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PLA N

l - MOTIVATIONS ET OBJECTIFS DE L'ETUDE -

II - CONDITIONS D'EXECUTION DE L'ETUDE -

1 - Caractéristiques du sol et des amendements

al Caractéristiques du sol ferrallitique fortementdésaturé de MANTSOUMBA

bl Caractéristiques des amendements

2 - Dispositif et modalités de l'expérimentation

3 - Analyses et méthodes

III - RESULTATS -

A - PERCOLATS ET ELEMENTS LIXIVIES-

1 - La percolation et les volumes des percolats

2 - Les pH des percolats

3 - Les bicarbonates

4 - Les bases (Ca, Mg, K) dans les percolats

5 - Le phosphore total

6 - L'aluminium

7 - La manganèse

8 - Le fer

9 - La silice

10 - Le carbone organique

Il - L'azote total

B - EVOL!:!.TIO~ DES ~A~~T§.RIS!IQ.U§.S_D!:!. §.O~­

1 - Le pH

2 - Les carbonates

3 - Les bases échangeables

3.1 - Problème de détermination des bases échangeables3.2 - Bases échangeables et essai des bilans comparatifs

al Calcium et Magnésiumbl Potassium

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4 - La capacité d'échange cationique et taux de saturation

5 - L'aluminium échangeable

6 - Le manganèse

7 - Le phosphore

8 - La matière organique

9 - Les agrégats stables et les éléments fins dispersésdans l'eau

IV - CONCLUSIONS -

l - Effets des différents traitements

2 - Conséquences agronomiques

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