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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Chapter

Document type:: Monograph

Structure type:: Chapter

Title:: Part III. Cotton

Collection:: Economics Books

ENCLOSURE TO PART III. Serere Experimental Station, Uganda. Aus. At the present time breeding and selection is being done with the following aims: — Improvement of yield. Purity of strain. Maintenance of a regular 1 3-16in. staple. Maintenance of quality. Resistance to Blackarm disease. SELECTION. Single plants are selected from the growing crop in native plots and from progeny rows of the previous year. From these plants progeny rows are grown and 15 plants in each row very carefully observed, the following records being taken :— Daily flowering records. 5 day boll records. Weekly growth measurements. All plants are self fertilised by the tying method. Every boll is picked separately and the following characters are recorded for each boll: — Loculus number. Seeds from loculus. Weight of lint. Weight of seeds. Lint length. For each plant Lint Index and Ginning outturn are worked out. As a result of the analysis of the above observations the most promising rows are selected for growing in 1 acre increase plots in which 100 plants are selected at random for boll records and these are taken as the mean of the plot. Lint from these plots is sent home for spinning tests and if the report is favourable the best strain is grown in a large increase plot and also grown in a yield trial with types in general cultivation. If results are satisfactory yield trials are held at various sub-stations and then the strain is grown on in bulk and eventually distributed to natives. Cross BREEDING. Although the difficulty in dealing with large F3 and F4 generations is realised, a few crosses are being followed up. Apart from selection work, the question of yield improvement is being tackled by means of field experiments. such as sowing date, spacing and method of culture. In the case of newly introduced varieties, progeny rows are grown for several years and similar records to those mentioned above are made. Complete meteorological data is obtained and used for correlating with observations on progeny rows. (Sgd.) G. W. Nye. August, 1926. 159

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