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

Bibliographic data

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

Usage license:: Get license information via the feedback formular.

Chapter

Document type:: Monograph

Structure type:: Chapter

Title:: Part III. Cotton

Collection:: Economics Books

ENCLOSURE TO PART III. Mr. NYE said that in his field trials he used six different strains of a Nyasaland type; these were first grown in observation rows and then in yield trial plots; yield was given as per plant, or per 100 plants. Mr. CAMERON said that when he got new varieties he grew them on observation trial plots, alternating with a standard variety. Mr. PARNELL said his trials were intended to show how far varieties were suitable for different localities; there need be no accurate comparison of commercial varieties on his breeding station as none of the present varieties would survive after suitable strains were found. The Section decided That the main point was that whatever method was used it should be so designed as to permit the degree of accuracy being determined. (Notes on Cotton Breeding work in Nyasaland, Uganda, Southern Rhodesia, Portuguese East Africa, and Swaziland were prepared by Messrs. Ducker, Nye, Cameron, Senhor Grillo, and Mr, Wood. These notes are reproduced at the end of these minutes.) 4. SELFING METHODS. Mr. WOOD said that in Tanganyika he practised stitching, using a gang of 50 boys to do the work; he selfed all the flowers in the progeny rows. Mr. PARNELL said that he stitched his flowers; some damage was done to the plants during the process through treading. : Mr. DUCKER said he had used the stitching method, but found that the plants reacted unfavourably to the handiing; also this method appeared to allow free scope to boll worm, which was important in Nyasaland. The boll worm appeared to like to enter into the stitched flower. A method had to be devised to ensure selfing and to protect the young boll. He described a type of cover made of gauze 7 ins. x 7 ins. held together by a rubber ring; this was found satisfactory and inexpensive. When the gauze was treated with beech creosote it was insect repellant as well as a preservative. The gauze costs about 10d. per yard. Mr. WOOD asked what was the length of time the gauze was left on the plant. Mr. DUCKER replied that this depended on experience, but they were usually left on for four or five days. Different coloured gauzes might possibly be used. | Mr. KOCH said that paper was used successfully in South Africa for tobacco and ‘copper wire for cotton. © Mr. NYE said that in Uganda sisal fibre was used for tying; the tips were tied every morning. Mr. DUCKER asked at what stage in the work one would stop selfing. Mr. WOOD said that he selfed all plants from one individual selection; he asked how often the collection of lint from selection was made. Mr. NYE said that he collected the lint every five days; each boll was picked separately and put in an envelope and the weight of lint and weight of seed per boll per plant taken in each progeny row; he selected 15 plants so as to estimate uniformity. 148

Access restriction

Copyright

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

Monograph

Chapter

Table of contents

Download

Monograph

Chapter

This page

Image fragment

Citation links

Citation recommendation