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(1964) n°2 - Royal Academy for Overseas Sciences

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— 401 —very well the waterlogging of the soil, according to the autoecologyof the species in its natural environment.The whole research exposed demonstrates the typical hygrophyticcharacter of Theobroma cacao L.Laboratoire d’Ecologie végétalede l’Université de LouvainOctobre 1963.BIBLIO G RA PH IE[ 1 } A d a m s, S.N . & M cK e l v ie , A.D. : Environmental requirements ofcocoa in the Gold Coast (Cocoa Conference, London, 22-27,1955).[ 2 ] G e s s n e r , F. : Der Wasserhaushalt der Epiphyten und Lianen (inHandb. d. Pjlanzenphys., III, 915-950, 1956).[ 3 ] H o m è s, M .-V.: L ’alimentation minérale du cacaoyer (Theobromacacao L .) (I.N .E.A .C., Série scient. n° 58, 128 p., 1953).[ 4 ] J a c o b, A. & v o n U e x k ü l l , H. : Fertilizer use. Nutrition andManuring of Tropical Crops (Verlagsges. für Ackerbau mbH.,Hannover, 491 p., 1958).[ 5 ] L a b r iq u e, J.-P.: L a m esure en courant continu de la conductivitéélectriqu e des eaux ( Vegetatio, X , 42-52, 1961).[ 6 ] L e b r u n , J. : Sur l’allure de la déshydratation foliaire chez diversesespèces du genre Coffea L . (Bull. Acad. Roy. Belgique, Cl. Sc.,49, 684-696, 1963).[ 7 ] L e m é e , G . : Recherches éco-physiologiques sur le cacaoyer (Rev.Gén. Bot., 63, 41-94, 1956).[ 8 ] M il t h o r p e, F.L. : Changes in the drought resistance of wheatseedlings during germination ( Ann. of Bol., 14, 79-89, 1950).[ 9 ] P a r k e r , J.: Differences in survival of excised Ponderosa Pineleaves of various ages (Plant Phys., 29, 486-487, 1954).[1 0 ] P e k e l, A .: Fonctionnement du bourgeon et résistance à la sécheressechez Hevea brasiliensis M ÜLL.-ARG. (Bull, de l’Acad.roy. Sc. Outre-Mer, V III, 476-501, 1962).[1 1 ] R e h d e r , H .: Versuche zur Bestimmung der Saugkraft mit derSchardakow-Methode {Ber. Geobot. Inst. Riibel Zürich für 1958,91-110, 1959).[1 2 ] S c h a r d a k o w , W .S . : (Arb. Akad. Wiss., Usbek. SSR, Taschkent,1956 et 1957 — en russe), d’après W a l t e r , H .: (inFortschr. d. Botanik, 20, 102-103, 1958).[1 3 ] S t o c k e r , O .: Das W asserdefizit von Gefäßpflanzen in verschiedenenKlimazonen ( Planta, 7, 382-387, 1929).

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