Abstract:Alocação de fotoassimilados marcados e relação fonte-dreno em figueiras cv. Roxo de Valinhos. 1. Relação fonte e dreno RESUMO O objetivo neste trabalho foi avaliar a alocação de fotoassimilados utilizando o isótopo estável do carbono-13 como marcador, assim como avaliar a relação fonte-dreno nos diferentes órgãos, em plantas em estádio reprodutivo da espécie Ficus carica L. Para tanto, uma folha da figueira considerada adulta através da caracterização fotossintética com um medidor portátil de fotossíntese IRGA… Show more
The cycle pruning programmed is a reinvigoration technique widely employed in Conilon coffee. This strategy may also be adopted for Arabica coffee to increase its crop longevity and yield. In this scenario, the present study proposes to examine the influence of the cycle pruning programmed on the vegetative and productive development of Arabica coffee. The experiment was developed in the field as a randomized-block design with four replicates. Treatments were tested in a 4 × 2 factorial arrangement consisting of four stem densities (4000, 8000, 12000 or 16000 stems ha-1) and two management strategies for the removal of plagiotropic branches (annual or biennial removal of branches which had reached 70% or more of their production capacity). For some variables, the treatments were organized as a 4 × 2 × 2 factorial arrangement in which the last factor corresponded to two regions of data collection in the plant (upper or lower). For all factorial arrangements, an additional treatment (control) was employed corresponding to traditional pruning (recepa). Annual or biennial removal of plagiotropic branches which had attained 70% or more of their production capacity can be adopted with no losses to crop yield. The cycle pruning programmed improves the distribution of branches, increases canopy area and prevents the occurrence of the “naked neck” phenomenon, observed in control treatment. Additionally, it provides better agronomic and productive performance; therefore, it can be used as a substitute for recepa.
The cycle pruning programmed is a reinvigoration technique widely employed in Conilon coffee. This strategy may also be adopted for Arabica coffee to increase its crop longevity and yield. In this scenario, the present study proposes to examine the influence of the cycle pruning programmed on the vegetative and productive development of Arabica coffee. The experiment was developed in the field as a randomized-block design with four replicates. Treatments were tested in a 4 × 2 factorial arrangement consisting of four stem densities (4000, 8000, 12000 or 16000 stems ha-1) and two management strategies for the removal of plagiotropic branches (annual or biennial removal of branches which had reached 70% or more of their production capacity). For some variables, the treatments were organized as a 4 × 2 × 2 factorial arrangement in which the last factor corresponded to two regions of data collection in the plant (upper or lower). For all factorial arrangements, an additional treatment (control) was employed corresponding to traditional pruning (recepa). Annual or biennial removal of plagiotropic branches which had attained 70% or more of their production capacity can be adopted with no losses to crop yield. The cycle pruning programmed improves the distribution of branches, increases canopy area and prevents the occurrence of the “naked neck” phenomenon, observed in control treatment. Additionally, it provides better agronomic and productive performance; therefore, it can be used as a substitute for recepa.
Objetivou-se avaliar a fitomassa e produtividade da melancieira em função do número de frutos por planta e do espaçamento de plantio. O delineamento experimental utilizado foi em blocos casualizados com quatro repetições e os tratamentos foram alocados em parcelas subdivididas do tipo 2 x 4. A parcela constou do número de frutos por planta (1 e 2 frutos) e na subparcela pelo espaçamento de plantio (3,0 x 0,4 m), (3,0 x 0,8 m), (3,0 x 1,2 m) e (3,0 x 1,6 m). O cultivo da melancieira no espaçamento mais adensado de 3,0 x 0,4 m associado à condução das plantas com dois frutos se destacaram de forma significativa no acúmulo de massa seca total na planta. O espaçamento mais adensado associado a condução da planta com apenas um fruto elevou a massa média do fruto da melancieira. A condução da planta com dois frutos e nos espaçamentos de 3,0 x 0,4 m registrou a maior produtividade da cultura.
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