The wheat quality and yield may be limited or compromised by several factors in the field, being the climatic main factor at the end of the crop cycle. The aim of the study was to determine whether different harvest times affect crop yield and wheat grain quality; four experiments were conducted, differing by cultivars type and sowing time, at Ponta Grossa city, PR, Brazil. The experimental design used for both cultivars (BRS-Pardela and Quartzo) were randomized complete block with five grain moisture content at harvest time (30, 25, 20, 15 and 13%) being 4 replications. For the first sowing time, the different harvesting times had no effect in yield, falling number (FN) or hectoliter weight (HW) for both cultivars. In the second sowing time, the yield components and yield for both cultivars were not affected by the different harvest times. A linear and quadratic decrease on the pH with the delaying of harvest time was noticed for BRS-Pardela and Quartzo, respectively, for the FN only the BRS-Pardela showed quadratic reduction delaying the harvest time.

The arrangement of plants in paired spacing is one of the management practices being used in some crops resulting in increased yield. Aiming to evaluate the arrangements and plant density on agronomic characteristics, yield components and yield of two wheat cultivars, one experiment was carried out on a Haplic Cambisol Tb typical dystrophic soil, with two cultivars, in the city of Ponta Grossa, PR,. The design experimental was randomized blocks in a factorial design 2×4, with four replications. The treatments consisted of two plant arrangements (single and paired spacing) and four plant densities (45, 60, 75 and 90 plants m -1 ), applied in two wheat cultivars (Marfim and BRS-Tangara). At Paired spacing the number of spikes per square meter and yield were lower than single spacing, even with higher grain weight in both wheat cultivars. The paired spacing did not result in increased yield for both wheat cultivars.

Resumo: O trabalho objetivou avaliar os efeitos da dessecação em pré-semeadura, do modo de aplicação de herbicida em pós-emergência e da aplicação de trinexapac-ethyl na cultura do milho, em dois anos consecutivos. O delineamento experimental foi em blocos ao acaso, com esquema fatorial 2 x 2 x 2 (com e sem dessecação em pré-semeadura x aplicação única e sequencial de herbicida em pós-emergência x com e sem aplicação de regulador de crescimento), com quatro repetições. Os tratamentos constaram da dessecação ou não em pré-semeadura com 400 g ha-1 de paraquate, do modo de aplicação, única ou sequencial, do herbicida em pós-emergência mesotriona + atrazina para o híbrido Status TL e glifosato para o Maximus TLTG, além da aplicação ou não de trinexapac-ethyl. Avaliaram-se características morfológicas, componentes de rendimento e produtividade. Na safra 2010/11 a dessecação causou aumento da altura de plantas e maior produtividade para ambos os híbridos. A aplicação sequencial de herbicidas ocasionou maior número de fileiras por espiga para o Status TL e a aplicação do trinexapac-ethyl não promoveu alterações nas características avaliadas nessa safra. Na safra 2011/12, a dessecação em pré-semeadura promoveu maior produtividade no Maximus TLTG. Para o Status TL a dessecação em pré-semeadura resultou em maior número de espigas por planta. O modo de aplicação de herbicidas não alterou de maneira substancial as características avaliadas nos dois híbridos. A aplicação do trinexapac-ethyl resultou na diminuição da área foliar e do índice de área foliar do Maximus TLTG.Palavras-chave: Zea mays L.; trinexapac-ethyl; glifosato; mesotriona. Abstract:The study intended to evaluate the effects of desiccation in pre-seeding, of the herbicide application's mode in post-emergence and the application of trinexapac-ethyl of corn, in two consecutive years. The experimental design was made in randomized block with factorial scheme 2 x 2 x 2 (with and without desiccation in pre-seeding x single and sequential application of herbicide in postemergence x with and without application of growth regulator), with four repetitions. The treatments consisted of the desiccation or not in pre-seeding with 400 g ha-1 paraquat, the mode of application, single or sequential, of herbicides in post-emergence mesotrione + atrazine for hybrid Status TL and glyphosate for Maximus TLTG, besides the application or not of trinexapac-ethyl. Morphological characteristics, yield components and grain yield were evaluated. In 2010/11 crop the desiccation promoted an increase in plant height and greater yield for both hybrids. The sequential application of herbicides caused greater number of rows per ear for Status TL and the application of trinexapac-ethyl did not cause changes in the characteristics evaluated in this crop. In 2011/12 the desiccation in pre-seeding promoted a grain yield increase in Maximus TLTG. To Status TL the desiccation on the day of seeding resulted in a greater number of ears per plant. The application's mode of post-emergence herbicides di...