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3 results on '"tubérculos-semente"'

1. Shoot growth restriction in dry matter partitioning andminituber production of potato plants

Author

Dilson Antônio Bisognin and Jacso Dellai

Subjects
Solanum tuberosum L., área foliar, propagação de plantas, miniestacas, tubérculos-semente, Agriculture, Agriculture (General), S1-972
Abstract

The aim of this research was to determine the effect of shoot growth restriction in the dry matter partitioning and minituber production of potato plants grown in a closed soilless system. Minitubers of the cultivars 'Macaca' and 'Asterix' were planted in the greenhouse in the density of 100 hills m-2, during autumn and spring growing seasons. Growth restriction levels were gotten by pruning shoots at 10, 20 and 30cm height or without pruning. The growth restriction levels were identified by their respective leaf area index. The experiment was a factorial (cultivars x growth restriction x growing season) in a random design, with four replications. Growth restriction affected the dry matter production of potato plants in both growing seasons and cultivars. Pruning potato plants at 30cm is a feasible technique to control leaf area index and it has lower effect on harvest index and number than in dry matter production of minitubers. Growth restriction does not change dry matter partitioning of potato plants grown in soilless system.

Published
2015
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2. Shoot growth restriction in dry matter partitioning and minituber production of potato plants.

Author

Bisognin, Dilson Antônio and Dellai, Jacso

Subjects
*POTATO industry, *POTATO yields, *POTATO growing, *HYDROPONICS, *PLANTING
Abstract

The aim of this research was to determine the effect of shoot growth restriction in the dry matter partitioning and minituber production of potato plants grown in a closed soilless system. Minitubers of the cultivars 'Macaca' and 'Asterix' were planted in the greenhouse in the density of 100 hills m-2, during autumn and spring growing seasons. Growth restriction levels were gotten by pruning shoots at 10, 20 and 30cm height or without pruning. The growth restriction levels were identified by their respective leaf area index. The experiment was a factorial (cultivars x growth restriction x growing season) in a random design, with four replications. Growth restriction affected the dry matter production of potato plants in both growing seasons and cultivars. Pruning potato plants at 30cm is a feasible technique to control leaf area index and it has lower effect on harvest index and number than in dry matter production of minitubers. Growth restriction does not change dry matter partitioning of potato plants grown in soilless system. [ABSTRACT FROM AUTHOR]

Published
2015
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3. Efeito da densidade de plantação na produção de batata-semente

Author

Rodrigues, M.A., Barroso, Daniel, and Pereira, Elisabete

Subjects
Tubérculos-semente, Solanum tuberosum L, População, Calibres
Abstract

Plant spacing affects the total and graded yields of potatoes The object of the present research was to evaluate the influence of planting density on the number of main stems, tuber number and tuber weight par stem and per hectare. The economic return was also considered. Field trials were conducted in Bragança (North-East of Portugal). The treatments used were 3, 4.4 and 6’ and 4, 6, 8 and 10 tubers.m-2 in 1995 and 1996, respectively. Tuber weight and tuber number per stem decreased with closer spacing. On the contrary, tuber weight and tuber number per hectare increased with closer spacing. The higher graded tubers (> 6Omm) results did not show significant differences. The most profitable return occurred with the higher planting density tested. Finally we emphasise the importance of establishing more uniform grades of commercial seed in order to male better planting density recommendations. A densidade de plantação pode influenciar a produção de tubérculos e os seus calibres Durante dois anos consecutivos foram conduzidos ensaios de campo usando as densidades 3, 4.4 e 6 tubérculos.m2 em 1995 e 4, 6. 8 e 10 tub.m-2 em 1996. Avaliou-se o efeito da densidade no estabelecimento dos caules produtivos, no número de tubérculos e no peso fresco por caule e por unidade de superfície e compararam-se as margens brutas das densidades ensaiadas. Com o aumento da densidade o número de tubérculos e a produção por caule diminuíram. Na unidade de área o número de tubérculos e a produção aumentaram em todos os calibres com excepção para o calibre > 6Omm (excluído dos lotes semente). No calibre semente (28-45 mm), das densidades mínimas para as densidades máximas utilizadas, ocorreram aumentos de 18.8 para 35.3 t.ha-1 em 1995 e de 35.6 para 54.7 t.ha-1 em 1996. O resultado económico foi favorável até às densidades máximas ensaiadas para qualquer dos anos em estudo. A necessidade de se estabelecerem limites mais apertados entre os calibres comercializados como semente foi identificado como sendo o passo mais importante para se conseguirem progressos na recomendação das densidades de plantação.

Published
1997

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