versión impresa ISSN 0006-8705
Bragantia vol.10 no.5 Campinas mayo 1950
Efeito da época de semeação na produção do Hibiscus cannabinus L.
J. C. Medina
Engenheiro agrônomo, Secção de Plantas Fibrosas Diversas, Instituto Agronômico de Campinas
In order to determine the effect of planting time on growth and yield of kenaf (Hibiscus cannabinus L.), experimental trials in randomized blocks were conducted on various soils in different localities of the State of São Paulo, during the crop years 1947-48, 1948-49, and 1949-50.
Plantings were made at 15 day intervals, beginning Octobre 15, and ending November 30, in rows 20 cm appart and seeded at the rate of 50 kilograms of seed per hectare in the 1947-48 plantings, and in rows 30 cm appart and seeded at the rate of 33 kilograms of seed per hectare in the 1948-49 and 1949-50 plantings.
Harvest operations were carried out at the time the plants were in full bloom and green weight of foliated stems were determined.
Average yield data showed that higher yields of green foliated stems were obtained from plantings made on October 15 and October 30. The data on average height attained by the plants for each date of plantings tested show a decrease from the first (Oct. 15) to the last (Nov. 30) plantings.
It was found that in spite of the fact that the last planting were made 45 days after the first planting, there was a difference of only 11 days in the time of opening of the first flower. This is due to the fact that kenaf exhibits a marked response to length of day (photoperiodism).
The results obtained in this investigation showed that kenaf is a fibrous bast plant well adapted to cultivation on various soils types and in different locations in the State of São Paulo.
Experience in Cuba indicates that production of kenaf can be mechanized both in the field and decorticating operations. This possibility of mechanization plus the indication of substancial yields indicated by the present tests, fully justifies official encouragement for further study and development of this plant as a domestic source of jutelike fiber that might be used in coffee bag manufacture.
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