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

1 ENCLOSURE TO PART 111. The majority of these strains are in the stage of progeny rows. That is they are represented by progeny rows each obtained from a single plant selection of the preceding year. Two strains have been sown as bulks and of these one will have to be discarded on account of Jassid susceptibility. Up to this season, 1925-26, all work has been done at the Makwapala Cotton Station which is situated at an elevation of about 2,100 feet above sea level. . From and including the 1926-27 season it is proposed to dupicate the work at the Port Herald Cotton Station which lies at about 150 feet elevation. It is considered that these two stations cover the main types of climatic conditions under which cotton is grown in Nyasaland. All plants in all progeny rows are being harvested separately each into its own bag and comparisons are being drawn between the progeny rows in respect of the evenness of their component plants as regards Lint and Seed characteristics. Judgment being used in deciding which of the progeny rows are to be examined in this fashion, susceptibility or otherwise to Jassid attack being an important factor, provided that is that the rows are even vegetatively in so far as ordinary observations go. It is proposed to carry on the strains derived from these progeny rows in future seasons by taking for sowing as further progeny rows a number of plants which lie nearest the mean for the rows. From and including the 1926-27 season it is hoped that it will be possible to ensure self fertilisation in the case of all plants grown in the progeny rows. The tendency, therefore, will be, as time goes on to establish nucleus stocks of strains which will become more and more homozygous with each year that they are grown. A preliminary test will be made each season with part of the bulk seed from the progeny rows which appear to be particularly promising, using flowering and fruiting studies to decide which strains are worthy of inclusion in full field trials in the following season. The balance of the bulk seed being sown in each case in an increase plot. Full field trials will consist of plots, sown with seed obtained from the increase plots, arranged in such a way as to give a known degree of accuracy to the results obtained. All new strains used in these trials will be tested against the ordinary field crop as a whole as well as against one another. The most superior strain will be further bulked with a view to replacing with it the ordinary field crop as time goes on. The aim will be to retain the pure parent stock and from this obtain further supplies of seed wherewith to renew the general seed stocks as required. Any new varieties obtained in the future will be first sown in observation plots and then selections from them will be passed to the progeny rows for purification. (Sgd.) H. C. Ducker. August, 1926. AR

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