Proceedings of the South & East African combined agricultural, cotton, entomological and mycological conference held at Nairobi, August, 1926

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Monograph

Identifikator:: 1738588467

URN:: urn:nbn:de:zbw-retromon-115043

Document type:: Monograph

Title:: Proceedings of the South & East African combined agricultural, cotton, entomological and mycological conference held at Nairobi, August, 1926

Place of publication:: Nairobi

Publisher:: East African Standard

Year of publication:: 1926

Scope:: VI, 337 Seiten; Ill.

Digitisation:: 2020

Collection:: Economics Books

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Document type:: Monograph

Structure type:: Chapter

Title:: Part III. Cotton

Collection:: Economics Books

ENCLOSURE TO PART III. 147 The question of measurement of plants was discussed in detail. Clerical Side of Keeping Records. Mr. DUCKER said that he could only keep a few records of strains not retained, owing to the labour involved. The Section was generally of opinion That it was impossible to keep records of all strains and that it would be possible only to keep records of strains retained. 2. NOMENCLATURE OF NEW STRAINS. Mr. DUCKER said that in Nyasaland each strain was given a letter and sub-strains were differentiated by numbers. All strains adopted in Nyasaland were commercial varieties which had been imported. Mr. NYE said that in Uganda a number was used for the strain and another number for the sub-strain. THE CHAIRMAN (Mr. Milligan) considered that possibly the best way o: nomenclature might be to use the name of the station for all strains, followed by a number. After some discussion on this question, the Section agreed That the best method of nomenclature would be to designate strains by the names of the stations at which they were produced, in some cases with the addition of letters, each individual strain being differentiated by a number. They further drew attention to the fact that the registration of the stations and numbers adopted would be desirable. 3. GENERAL TECHNIQUE AT PLANT BREEDING STATIONS. Mr. CAMERON asked for information on the general procedure at other plant breeding stations as regards testing of yields. The size of plot he used for variety trials wus one-twentieth of an acre. New strains were grown under observation and these were then expanded nto variety trials; plant diagrams were made on each variety. A large number of replications appeared to be necessary to obtain accurate results. Mr. NYE said that in Uganda he used square plots of one- twentieth of an acre and replicated five times. Mr. WOOD suggested 12 x 20 as a good size; he used four plots. Mr. DUCKER said he divided his variety work into two sections : (a) Observation. (b) Field experiments laid out on the Latin square principle. He used the same number of replicates as the number of variants. The main endeavour was to get down to as few strains as possible. Mr. CAMERON asked what degree of accuracy was found by this method. Mr. PARNELL said so far no accurate trials had been necessary in his work, as, in its present stage, he had to a large extent to rely on observations and judgment. He further stated that in South Africa a series of tests had been conducted over the Union; five varieties were grown by farmers under the supervision of a local officer; plots of tour rows, 75 vards and upwards. repiicated four times.

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