Soils- -Continued. 



Soils- -Continued. 



475. CROEGAERT, J. Note sur quelques sols a 

 cacaoyers au Congo Beige. Inst. Natl, pour 1' Etude Agron. 

 du Congo Beige. Semaine Agr. de Yangambi, 1947. 

 Compt. Rend. 2:582-588. Ref. 35.4 In7 



Includes data on chemical composition and climatic 

 conditions. 



476. CROEGAERT, J. Notice p6dologique sur la 

 culture du cacaoyer au Congo Beige. B. Agr. du Congo 

 Beige 40:865-870. Mar. 1949. 24 K83 



Edaphic and climatic requirements of cacao and 

 analyses of some cacao-growing soils of Belgian Congo. 



477. CROEGAERT, J., and LIVENS, J. Variability et 

 correlations de quelques constantes chimiques dans les 

 sols de Yangambi. Inst. Natl, pour I'Etude Agron. du 

 Congo Beige. Semaine Agr. de Yangambi, 1947. Compt. 

 Rend. 2:655-663. 35.4 In7 



Figure 1 shows relation between soil reaction and con- 

 dition of cacao trees in a plantation. 



478. DOYNE, H. C. Some aspects of the soil require- 

 ments of cacao in Nigeria. West African Agr. Conf. 3. 

 Papers l(Nigeria):19-21. Ref. 1938. 27 W52 



Discusses acidity, moisture, and plant food. 



479. GREENWOOD, M. Some cacao soils of the 

 eastern plains in Nigeria. Nigeria. Agr. Dept. Ann. B. 

 10:36-49, 220-223. Ref. 1931. 24 N563B 



Includes mechanical and chemical analyses. 



480. HARDY, F., MCDONALD, J. A., and 

 RODRIGUEZ, G. Cacao soil surveys. Imp. Col. Trop. 

 Agr. [Trinidad] Cacao Res. Ann. Rpt. (1934)4:51-53. Ref. 



1935. 68.39 CIl 



Princes Town Marl soil and Green Clay soil, occurring 

 in South Trinidad. 



481. HARDY, F., and RODRIGUEZ, G. Cacao soil 

 surveys. 3. Siparia-Penal-Moruga district of Trinidad. 

 Imp. Col. Trop. Agr. [Trinidad] Cacao Res. Ann. Rpt. 

 (1935)5:30-34. Ref. 1936. 68.39 Cll 



482. HARDY, F., and GRIFFITH, G. Carbon/nitrogen 

 ratios in cacao soils. Nature 129:132. Jan. 23, 1932. 

 472 N21 



Based on laboratory examination of profile samples 

 from Trinidad, Grenada, and Tobago. 



483. HARDY, F. The chief soil-types of Trinidad. 

 Agr. Soc. Trinidad & Tobago. Proc. 34:443-458. Nov. 

 1934. 8 T73 



Includes brief discussions of the requirements of cacao 

 and other chief crops. 



484. HARDY, F. Soils and soil-types suitable for 

 hybridization of cacao and the improvement of cacao 

 soils by manuring. Cocoa Res. Conf. Rpt. & Proc. 1945: 

 129-131. 1945. 68.39 C64 



485. HARDY, F. Some aspects of cacao soil fertility 

 in Trinidad. Trop. Agr. [Trinidad] 13:315-317. Dec. 



1936. 26 T754 



486. HARDY, F., and RODRIGUEZ, G. Some Gold 

 Coast cacao soils. I-II. Imp. Col. Trop. Agr. [Trinidad] 

 Cacao Res. Ann. Rpt. (1936)6:8-13; (1937)7:32-38. 1937- 

 38. 68.39 Cll 



E. H. Amoroso-Centeno, joint author of F>t. 11. 



487. HARDY, F. Some Nigerian -cacao soils. Imp. 

 Col. Trop. Agr. [Trinidad] Cacao Res. Ann. Rpt. (1938)8: 

 23-26. Ref. 1939. 68.39 Cll 



488. HARDY, F. Some soil relations of the root 

 system of cacao; further results of investigations in 

 Trinidad. Trop. Agr. [Trinidad] 21:184-195. Ref. Oct. 

 1944. 26 T754 



489. HARDY, F. Studies in West Indian soils. I. The 

 soils of Dominica, their genesis and fertility considered 

 in relation to reaction. West Indian B. 19:86-123, illus. 

 Ref. Sept. 1921. 8 W522 



F>t. 3, The correlation of reaction and fertility in 

 certain cacao and lime soils of Dominica. 



490. HARDY, F., AKHURST, C. G., and GRIFFITH, G. 

 Studies in West Indian soils. 01. The cacao soils of 

 Tobago. (Report on a visit made during January, 1930, 

 and on the laboratory examination of selected profile soil 

 samples.) Port-of-Spain, Trinidad, Govt. Ptg. Off., 



1931. 22 p., illus. Ref. 56.23 H223 

 Supplement to Trop. Agr. [Trinidad], Feb. 1931. 



491. HARDY, F., MCDONALD, J. A., and 

 RODRIGUEZ, G. Studies in West Indian soils. IV. The 

 cacao soils of Grenada, their origin, formation and chief 

 characters. Port-of-Spain, Trinidad, Govt. Itg. Off., 



1932. 28 p., illus. Ref. 56.23 H223 

 Supplement to Trop. Agr. [Trinidad], Dec. 1932. 

 Maps show rough soil types and rainfall. 



492. HARDY, F., DUTHIE, D. W., and RODRIGUEZ, G. 

 Studies in West Indian soils. X. The cacao and forest 

 soils of Trinidad. B. South-Central District. Port-of- 

 Spain, Trinidad, Govt. Ptg. Off., 1936. 56 p., illus. 



Ref. 56.23 H223 



493. HARDY, F. Studies on aeration and water supply 

 in some cacao soils of Trinidad. Trop. Agr. [Trinidad] 

 20:89-104. May 1943. 26 T754 



494. JACKS, G. V. Tropical soils in relation to 

 tropical crops. 10. Cacao. Imp. Bur. Soil. Sci. Tech. 

 Commun. 34, 59 p. Ref. 1936. 56.9 In72 



Cacao, p. 52-56. 



495. LEES, H. The copper-retaining powers of 

 different cacao soils. Biochem. J. 43:624-626. Ref. 

 1948. 382 B52 



Experiments comparing Trinidad soils on which cacao 

 production decline is greater or less. 



496. LEES, H. Preliminary studies on the biochemis- 

 try of two cacao soils. In Cocoa, Chocolate and Confec- 

 tionery Alliance. Report of the Cocoa Conference, 1949, 

 p. 24-26. London, 1949. 68.39 In82 



Includes discussion, p. 25-26. 



497. MCDONALD, J. A. Cacao soil surveys. Imp. 

 Col. Trop. Agr. [Trinidad] Cacao Res. Ann. Rpt. (1933)3: 

 36-41. Ref. 1934. 68.39 Cll 



Discussion and conclusions based on comparison of the 

 cacao soils of Trinidad, Tobago, and Grenada. 



498. MCDONALD, J. A. An environmental study of the 

 cacao tree. Imp. Col. Trop. Agr. [Trinidad] Cacao Res. 

 Ann. Rpt. (1931)1:29-38; (1932)2:ii-iv. Ref. 1932-33. 

 68.39 Cll 



, Comparisons of soil profiles and environmental con- 

 ditions for 2 experimental plots, one a good site, the other 

 a poor one. 



499. MCDONALD. J. A., and RODRIGUEZ, G. The 

 manganese content of West Indian cacao soils. Imp. Col. 

 Trop. Agr. [Trinidad] Cacao Res. Ann. Rpt. (1935)5:43-47. 

 Ref. 1936. 68.39 Cll 



500. MCDONALD, J. A. Phosphate fixation in soils in 

 relation to iron availability, and its possible connection 

 with the gypsum phosphate problem in cacao soils. Imp. 

 Col. Trop. Agr. fTrinidad] Cacao Res. Ann. Rpt. (1934)4: 

 86-87. 1935. 68.39 Cll 



501. MCDONALD, J. A. Progress of some detailed 

 investigations. I-II. Imp. Col. Trop. Agr. [Trinidad] 

 Cacao Res. Ann. Rpt. (1932)2:vi-viii. Ref. 1933. 

 68.39 Cll 



I, The phosphate status of cacao soils; II, The nitrogen 

 status of cacao soils. 



502. MCDONALD, J. A. A soil survey of the Gran 

 Couva District, Central Range, Trinidad. Imp. Col. Trop. 

 Agr. [Trinidad] Cacao Res. Ann. Rpt. (1931)1:38-42. 

 1932. 68.39 Cll 



503. MCDONALD, J. A., HARDY, F., and 

 RODRIGUEZ, G. Studies in West Indian soils. VII. The 

 cacao soils of Trinidad. A. Montserrat District. Port-of- 

 Spain, Trinidad, Govt. Ptg. Off., 1933. 50 p., illus. 



Ref. 56.23 H223 



For other studies in this series see Hardy, F. 



504. MCDONALD, J. A. A survey of some Trinidad 

 cacao soils. Imp. Col. Trop. Agr. [Trinidad] Cacao Res. 

 Ann. Rpt. (1932)2:iv-v. Ref. 1933. 68.39 Cll 



Outline of soil survey work during 1932 and brief dis- 

 cussion of water relationships of cacao soils. 



505. NOTES on cacao soils. Agr. Soc. Trinidad & 

 Tobago. Proc. 20:192-203. June/July 1920. 8 T73 



Consists chiefly of notes by E. H. Cunningham- Craig on 

 types of soil suitable for growing cacao in Trinidad. 



506. RIGOTARD, M. Composition de terres des 

 Antilles franfaises et appreciation de la fertility des 

 cacaoyferes. Agron. Colon. 5:140-146. Nov. 1920. 

 26 Ag812 



507. STRICKLAND, A. H. The arthropod fauna of 

 some tropical soils. Trop. Agr. [Trinidad] 21:107-114. 

 Ref. June 1944. 26 T754 



Includes data on soil fauna of wet and dry cacao plan- 

 tation land of Trinidad. 



508. STRICKLAND, A. H. A survey of the arthropod 

 soil and litter fauna of some forest reserves and cacao 

 estates in Trinidad, British West Indies. J. Anim. Ecol. 

 14:1-11, illus. Ref. May 1945. 410 J826 



509. TAFO STATION soils. Gold Coast Farmer 8:105- 

 106. June 1939. 24 G563 



Table II gives analysis figures for a number of surface 

 samples; Table HI refers to' samples from a profile pit. 



16 



