Avaliação da viabilidade de sementes de café por exsudatos
In: Semina: revista cultural e científica da Universidade Estadual de Londrina. Ciências agrárias, Band 27, Heft 1, S. 21
ISSN: 1679-0359
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In: Semina: revista cultural e científica da Universidade Estadual de Londrina. Ciências agrárias, Band 27, Heft 1, S. 21
ISSN: 1679-0359
In: Semina: revista cultural e científica da Universidade Estadual de Londrina. Ciências agrárias, Band 33, Heft 0
ISSN: 1679-0359
In: Revista brasileira de tecnologia agroindustrial: RBTA, Band 4, Heft 1
ISSN: 1981-3686
In: Semina: revista cultural e científica da Universidade Estadual de Londrina. Ciências agrárias, Band 30, Heft 2, S. 271
ISSN: 1679-0359
In: Semina: revista cultural e científica da Universidade Estadual de Londrina. Ciências agrárias, Band 34, Heft 6Supl1, S. 3173
ISSN: 1679-0359
In: Semina: revista cultural e científica da Universidade Estadual de Londrina. Ciências agrárias, Band 26, Heft 2, S. 167
ISSN: 1679-0359
In: Revista brasileira de tecnologia agroindustrial: RBTA, Band 6, Heft 1
ISSN: 1981-3686
In: Semina: revista cultural e científica da Universidade Estadual de Londrina. Ciências agrárias, Band 40, Heft 1, S. 113
ISSN: 1679-0359
Vegetative canopy architecture, and plant population density, has a direct influence on the growth and production of crops. The objective of this study was to evaluate the growth of four cassava cultivars of contrasting canopies, in four population densities, during two vegetative cycles. A randomized complete block design was used in a subdivided plot scheme, with two replications, with the population densities in the plots and harvesting times in the subplots. 'Branca de Santa Catarina' (BSC), 'IAC 13', 'IAC 14-18' and 'Fibra' were collected every four months, beginning at 120 and ending at 720 days after planting (DAP). Primary data on dry matter and leaf area were calculated. The total dry mass (Wt), leaf area ratio (La), leaf area index (L), relative growth rate (Rw), and net assimilation rate (Ea) were calculated based on the primary data. All cultivars accumulated more total dry mass (Wt) at lower planting densities. The plants reached a higher leaf area ratio (La) 120 days after planting. In the second vegetative cycle, the four cultivars, independently of the population, presented a reduction of assimilate translocation to the leaves. Relative growth rate (Rw) of the cultivars varied strongly with the plant population only in the second cycle. 'IAC 14-18' showed greater dependence on spacing, and 'Fibra' less dependence. Growth (Rw) and assimilatory (Ea) rates decreased at the end of the first cycle, then increased slowly until the end of the second cycle of vegetation.