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. Mr. DUCKER said that he harvested every plant separately and took the lint and seed characteristics. Mr. WOOD asked the opinion of the Section on the possibility of adopting a standard method of sampling and measuring by which the purity of a strain could be expressed numerically. Mr. PARNELL said that the limiting factor with him was jassid resistence and the necessity for a resistant strain was so great that he was propagating one for distribution, which, although by no means uniform, was decidedly better than any other obtainable. This would immediately be followed by a more uniform type. He selected 12 plants from every row, whereas Mr. Ducker used every plant and Mr. Nye 15 plants from each progeny row. Mr. DUCKER considered that periodic pickings from the progeny rows were of little value, but Mr. Parnell considered that this did show up differences. Mr. NYE wanted to know if a standard size of plot for variety trials could be adopted. Mr. PARNELL considered that we had not yet sufficient experience. Mr. CAMERON suggested that rows were just as suitable as plots and were much easier to handle. Mr. NYE said that in Uganda he used rows inside the plots; the edge effect was two plants deep. After some discussion It was decided to call attention to the possibility of inaccuracy in comparing strains. Mr. PARNELL, as a result of the discussion, asked whether anyone had experience as to whether in comparing strains the spacing methods adopted were likely to affect comparative results—two feet was his standard. Mr. DUCKER replied that he had only made casual observations on this point, but it had been noticed that one particular strain was intolerant of wide spacing. 5. Tue Position win REGARD 10 CROSSING. Mr. NYE asked for information regarding crossing; he found it very difficult to get results. Mr. PARNELL said that crossing ought to be valuable, but in practice it did not appear to be so. At present he was crossing Cambodia with another type in order to combine jassid resistance with other desirable qualities, but it appeared as if this would be obtained by selection. Selection is obviously the first thing, and if crossing is gong to be of any value an early start should be made at it, for it takes a long time before any results are achieved. Other members of the Section expressed their views on this question, the general opinion being that, although no very valuable results had yet been obtained from crossing, this was probably due to the magnitude of the work necessary in bringing it to a successful conclusion. 6. ExcrnaNes oF Strains BErwrEN DIFFERENT TERRITORIES. Mr. KOCH thought it would be very useful if the Agricultural Departments of the African Territories could keep in touch with each other as regards new strains. so that when any good strain was 149

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