Soils - -Continued. 



510. VINE, H., THOMPSON, H. A., and HARDY, F. 

 Studies on aeration of cacao soils in Trinidad. Trop. Agr. 

 [Trinidad] 19:175-180, 215-223; 20:13-24, 51-56. Ref. 

 Sept. 1942-Mar. 1943. 26 T754 



Contents: Introduction, by F. Hardy; Pt. 1, Porosity and 

 air-space in a cacao soil-type in Trinidad, by H. Vine; 

 Pt. 2, Soil-air composition in certain cacao soil-types in 

 Trinidad: (A) River fine sand: River Estate, by H. Vine; 

 (B) Soil air composition at other cacao sites, by H. A. 

 Thompson; Pt. 3, Gaseous diffusion in certain cacao soil- 

 types in Trinidad, by F. Hardy; Pt. 4, Corrosion of iron 

 as a measure of soil aeration, by H. Vine. 



Fertilizers 



511. BECKETT, W. H. Results of cacao manurial 

 trials. Gold Coast Dept. Agr. B. 22:99-111. 1930. 



24 G56B 



Trials at Kpeve, Kumasi, Asuansi, and Aburi. 



512. BELLEFROID, V. DE. Etude sur les travaux 

 d'enrichissement du sol k Lukolela. B. Agr. du Congo 

 Beige 32:539-553, illus. Sept. 1941. 24 K83 



Results of experiments with composts including cacao 

 shell waste on cacao plantations. 



513. CACAO manurial experiments. Trop. Agr. 

 [Ceylon] 63:207-209. Oct. 1924. 26 T751 



Comments on reports of early experiments. 



514. CRUZ RIASCOS, L. C, and DAGNINO RUIZ, J. 

 El abonamiento correcto del cacao. Rev. Nac. de Agr, 

 [Bogota] 41(501/502):35-36. Jan./Feb. 1947. 9.4 R32 



515. CULHAM, A. B. Initial variations between plots 

 used for cacao manurial trials. Gold Coast Dept. Agr. B. 

 13:78-82, illus. 1928. 24 G56B 



Trials conducted at Aburi, Asuansi, Kpeve, and Kumasi. 



516. DUARTE M., J. P. C6mo aumentar la 

 producci6n de cacao en el pafs sin hacer nuevas 

 plantaciones. Dominican Repub. Sec. de Estado de Agr. 

 y Riego. Rev. de Agr. y Com. 25:1306-1309. Aug. 1934. 

 8 R323 



Advocates use of fertilizers to increase yields. 



517. DUNLOP, W. R. On the significance of the 

 results obtained in the Dominica manurial experiments 

 with cacao. West Indian B. 16:121-126, diagr. 1917. 



8 W522 



Includes records of yields from five trial plots, 

 1902/03-1915/16. 



518. LES ENGRAIS de le cacao. Off. Internatl. des 

 Fabric, de Choc, et de Cacao. B. Off. 2:385-393. Oct. 

 1932. 68.38 Of2 



Summaries in English, German, Spanish, Italian, and 

 Portuguese. 



519. HARDY, F. Manurial experiments on cacao in 

 Trinidad: 1932-1936. Imp. Col. Trop. Agr. [Trinidad! 

 Cacao Res. Ann, Rpt. (1936)6:24-34. 1937. 68.39 ClI 



520. HARDY, F. Manurial experiments on cacao in 

 Trinidad: summary of results for 1937-[1939]. Imp. Col. 

 Trop. Agr. [Trinidad] Cacao Res. Ann. Rpt. (1937)7:40- 

 46; (1938)8:27-34; (1939)9:26-33. 1938-40. 68.39 Cll 



521. HERRERA VASCONEZ, C. La recuperaci6n del 

 cacao ecuatoriano. Ecuador. Segunda Zona. Ci.m. de Agr. 

 B. 2(7):5-7. Jan./Feb. 1948. 9.5 Ec95B 



Recommendations for application of nitrogen fertilizers. 



522. HOLLAND, T. H. A manurial experiment with 

 cacao. Trop. Agr. [Ceylon] 76:263-268. May 1931. 



26 T751 



Experiments at Peradeniya 1923-31. 



523. JOLLY, A. L. Uniformity trials on estate cacao 

 fields in Grenada, B. W. I. Trop. Agr. [Trinidad] 19:167- 

 174. Sept. 1942. 26 T754 



Manurial experiments. 



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

 effect of manurial treatments on the chemical composition 

 of cacao leaves: the diagnosis of soil and crop nutrient 

 requirements by means of leaf analysis. Imp. Col. Trop. 

 Agr. [Trinidad] Cacao Res. Ann. Rpt. (1934)4:75-82. 1935. 

 68.39 Cll 



525. MCDONALD, J. A. Manurial experiments on 

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

 Rpt. (1933)3:41-49; (1934)4:54-63; (1935)5:34-43. Ref. 

 1934-36. 68.39 Cll 



Experiments on six sites in Trinidad and Grenada. 



526. MCDONALD, J. A. Some aspects of the manuring 

 of cacao. Agr. Soc. Trinidad & Tobago. Proc. 34:39-49. 

 Jan./Feb. 1934. 8 T73 



Discusses some of the main findings of the author's 

 Studies in West Indian soils, VII. The cacao soils of 

 Trinidad. 



Fertilizers - -Continued. 



527. POUND, F. J. La fertilizaci6n del cacao en 

 Trinidad. Hacienda 36:400-402. Oct. 1941. 6 Hll 



Gives recommendations for various types of soils. 



528. POUND, F. J. The present position of fertilisers 

 and cocoa. Agr. Soc. Trinidad & Tobago. Proc. 39:98- 

 105. Apr. 1939. 8 T73 



Discusses results of fertilizer experiments on various 

 soil types. Includes progress reports on high yielding 

 cocoa strains and witches broom resistance trials. 



529. POUND, F. J., and VERTEUIL, J. DE. Results 

 of manurial experiments on cacao at Marper. Trop. Agr. 

 [Trinidad] 13:233-241. Sept. 1936. 26 T754 



530. TEMPANY, H. A. A study of the results of the 

 manurial experiments with cacao conducted at the 

 Botanic Station, Dominica. West Indian B. 14:81-119. 

 Apr. 1914. 8 W522 



Reports on experiments begun in 1902. 

 530a. TRINIDAD. DEPT. OF AGRICULTURE. 

 Manurial experiments on cocoa in Trinidad and Tobago, 

 by F. J. Pound. Port-of-Spain, 1940. 102 p. 68.39 T73 



Third of a series of reports on experiments carried 

 out under a grant from the Cocoa Subsidy Board. Earlier 

 reports not available for examination. 



531. VERTEUIL, J. DE. Estate experiments, 1910- 

 1917. Trinidad & Tobago Dept. Agr. B. 16:176-198. 1917. 

 8 T732B 



Manurial experiments at River Estate and ten private 

 estates. 



532. THE WEST African cacao industry. How to make 

 it a gilt-edged security. Trop. Life 21:99-101. July 

 1925. 26 T752 



Need for fertilizers and for experiments on use of 

 fertilizers. 



Reprinted in Agr. Soc. Trinidad & Tobago, Proc. 25:380- 

 387. Oct. 1925. 8 T73 



Yields 



533. AUCHINLECK, G. G. Variations in the yields of 

 cacao trees at Aburi Experiment Station, 1914-1926. 

 Gold Coast Dept. Agr. B. 13:74-77. 1928. 24 G56B 



Trials conducted and figures compiled by G. H. Eady. 



534. AUCHINLECK, G. G. Variations in the yields of 

 cacao trees at Asuansi Experiment Station. Gold Coast 

 Dept. Agr. B. 13:67-73. 1928. 24 G56B 



Reports field trials conducted by A. B. Culham and 

 J. Steele, 1919-26. 



535. AUCHINLECK, G. G. Yields of cacao on experi- 

 ment stations. (Summary to end of 1925.) Gold Coast 

 Dept. Agr. B. 4, 44 p., illus. Apr. 1926. Ref. 24 G56B 



536. CHEESMAN, E. E. Field experiments in cacao 

 research, 1943-44. Trop. Agr. [Trinidad] 22:64-66. Apr. 

 1945. 26 T754 



Yields of selected clones and comparisons between 

 cuttings and buddings in propagation experiments. 



537. CHEESMAN, E. E. Results of cacao experiments 

 in 1944-45. Trop. Agr. [Trinidad] 23:63-65. Apr. 1946. 

 26 T754 



Yields and evaluations of some I. C. S. clones, with 

 comparisons between trees propagated from buddings and 

 from cuttings. 



538. CHEESMAN, E. E., and POUND, F. J. Uniformity 

 trials on cacao. Trop. Agr. [Trinidad] 9:277-288. Ref. 

 Sept. 1932. 26 T754 



Prepared for the Field Experiments Committee, set up 

 by West Indian Conference of Agricultural Officers, 1930. 



Study of the correlation existing between the mean 

 annual yield in pods per cacao tree and the total tree-to- 

 tree variance. 



539. CHEESMAN, E. E. Yields in cacao experiments 

 1945-46. Trop. Agr. [Trinidad] 25:14-18. Jan./Dec. 

 1948. 26 T754 



Results of field experiments of the Cacao Research 

 Scheme. 



540. CIFERRI, R., and BARBENSI, G. Studi statistici 

 sul cacao. I. Probabile esistenza di una periodicity 

 quinquennale accertata attraverso I'analisi della 

 producione mensile di una azienda tipo della Republica 

 Dominicana. Riv. de Biol. Colon. 2:294-304. Aug. 1939. 

 Amer. Mus. Nat. Hist. Libr. 



Discusses probability of a five-year periodicity in 

 yields, based on statistical study of monthly production of 

 an estate in the Dominican Republic. 



Summaries in English, French, and German. 



17 



