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African Crop Science Journal
African Crop Science Society
ISSN: 1021-9730
EISSN: 2072-6589
Vol. 4, No. 2, 1996, pp. 249-255
Bioline Code: cs96063
Full paper language: English
Document type: Research Article
Document available free of charge

African Crop Science Journal, Vol. 4, No. 2, 1996, pp. 249-255

 fr
Mafongoya, P.L.; Mugendi, D.N. & Pedreira, C.G.S.

Résumé

Les emondes de leucaena (Leucaena leucocephala (Lam.) De
Wit) ont longtemps ete considerees comme une alternative aux
engrais azotes, mais l'utilisation efficace de N par les plantes
est souvent limitee. Il existe le potentiel  synchroniser la
liberation des substances nutritives avec la demande des
nutritifs par une variation du nombre et du placement des
emondes. Une experience factorielle (2x2x3) a ete effectuee pour
evaluer le potentiel des feuilles de leucaena de fournir de lte
aux plantes de mas (Zea mays L.) eleves en pots de terre
(Grossarenic Paleudult) en conditions de serres. Les facteurs
examines etaient les suivants: taux duplication (3 et 6 Mgha-1),
deux methodes de placement (surface vs incorporation), et trois
niveaux de fertilisation d'azote (0,50 et 150 kg ha-1) equivalent
de en forme de solution. Les emondes appliquees  la surface font
augmenter d'une facon significative le poids sec des pousses de
mas avec des niveaux plus eleves d'engrais azotes. L'incorporation des
emondes augmente le poids sec des pousses de mas, mais il n pas
de reponse significante avec les engrais azotes; ceci indique que
sous cette forme duplication, les emondes fournissent de lazote
d'une facon efficace. Le poids sec des pousses et le poids sec
total augmentaient avec des taux plus eleves dndes. La
recuperation dte augmentait par une application simultanee dndes
et drais azote. La recuperation d'azote etait plus importante quand
les emondes incorporees etaient comparees avec une application
la surface. 3 Mg ha-1 dndes appliquees donnaient une plus grande
recuperation (%) d'azote que 6 Mg ha-1. Au moment de la recolte, 6
Mg ha-1 demondes appliquees produisaient des plantes de plus hautes
tailles que 3 Mgha-1.

Mots Clés
L'efficacite de l'usage d'azote, methodes de placement, taux, emondes de leucaena

 
 en Evaluation of Leucaena leucocephala leaf prunings as a source of nitrogen for maize
Mafongoya, P.L.; Mugendi, D.N. & Pedreira, C.G.S.

Abstract

Prunings of leucaena [Leucaena leucocephala (Lam.) De Wit] 
have long been regarded as a useful alternative to N fertilizer,
but N use efficiency by crops is often low.  The potential exists
to synchronise nutrient release with crop nutrient demand through
variation in the rate and placement of prunings.  A 2x2x3
factorial experiment was conducted to evaluate the potential of
leaves of leucaena to supply N to maize (Zea mays L.)
plants grown in pots of soil (Grossarenic Paleudult) under
glasshouse conditions.  Factors tested were two rates of
application (3 and 6 Mg ha-1), two methods of placement (surface
vs incorporation), and 3 levels of N fertilizer (0, 50, and 150
kg ha-1 equivalent of urea in solution form).  Surface applied
prunings significantly increased maize shoot dry weight with
increasing levels of N fertilizer.  Although incorporation of
prunings increased maize shoot dry weight, the incorporated
treatments did not show any significant response to N fertilizer,
indicative of adequate N supply from prunings.  Both shoot and
total dry weight significantly increased with increasing rates
of prunings applied.  Nitrogen recovery was increased by applying
prunings together with N fertilizer.  There was a higher N
recovery with incorporation compared to surface application. 
Prunings applied at a rate of 3 Mg ha-1 gave higher %N recovery
than 6 Mg ha-1.  At the final harvest date, application of 6 Mg
ha-1 of prunings produced taller plants than 3 Mg ha-1.

Keywords
Nitrogen use efficiency, placement methods, rates, leucaena prunings

 
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