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| Soltani,E; Soltani,A; Galeshi,S; Ghaderi-far,F; Zeinali,E. |
| Volunteer canola (Brassica napus) and Sinapis arvensis are well identified weeds of different cropping systems. Quantitative information on regarding seed production by them is limited. Such information is necessary to model dynamics of soil seed banks. The aim of this work was to quantify seed production as a function of the size of those weeds. A wide range of plant size was produced by using a fan seeding system performed at two sowing dates (environments). Plant size varied from 3 to 167 g per plant for canola and from 6 to 104 g per plant for S. arvensis. Seed production ranged from 543 to14,773 seeds per plant for canola, and from 264 to 10,336 seeds per plant for S. arvensis. There was a close relationship between seed production per plant and plant... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Weed; Plant size; Density; Planting. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582011000300003 |
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| Lara,Daniela P.; Oliveira,Lázaro A.; Azevedo,Islaine F. P.; Xavier,Márcia F.; Silveira,Fernando A. O.; Carneiro,Marco Antonio Alves; Fernandes,G. Wilson. |
| The plant architecture hypothesis predicts that variation in host plant architecture influences insect herbivore community structure, dynamics and performance. In this study we evaluated the effects of Macairea radula (Melastomataceae) architecture on the abundance of galls induced by a moth (Lepidoptera: Gelechiidae). Plant architecture and gall abundance were directly recorded on 58 arbitrarily chosen M. radula host plants in the rainy season of 2006 in an area of Cerrado vegetation, southeastern Brazil. Plant height, dry biomass, number of branches, number of shoots and leaf abundance were used as predicting variables of gall abundance and larval survival. Gall abundance correlated positively with host plant biomass and branch number. Otherwise, no... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cerrado; Insect galls; Plant size; Structural complexity. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262008000100014 |
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