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

PART III. The following, in brief, is an outline of the work to be under- taken, if all goes well : — 1. Meteorological observations and recording of same. 2. Growing in observation lines of some seventy varieties of Cotton, which, so far as is known, have not been grown in Southern Rhodesia previously: (a) On unmanured land; and (b) on heavily manured land, with the object of discovering a variety or selection from a variety which wil give a dwarf or medium sized plant, when grown in rich soil. 3. Growing in observation lines of field selections made last season under conditions (a) and (b), as indicated above. 4. Recording, usual observations and measurements on selected plants of each variety and strain, grown on the Station. 5. A repetition of the variety trials conducted last year, with a view to ascertaining to what extent such trials can be relied upon. 6. A companson of Cotton plants grown—(a) in the insect proof cage, with (b) Cotton plants of the same variety grown under field conditions. 7. Observation rows from seed of the different varieties, grown under cage conditions last year, with a view to noting whether or not any crossing has taken place. 8. * Increase ” or *‘ small bulk >’ plots of what appears to be the better varieties among those which were grown in last year’s variety trials. The results of these trials are not yet to hand, nor is it likely that they will give any indications when they arrive, but three out of the five varieties appeared to be much better than Improved Bancroft. V. Uganpa. Aims. 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 8-16in. staple. Maintenance of quality. Resistance to Black arm 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 are 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. 121

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