Desempenho De Híbridos De Milho Para Silagem Cultivados Em Diferentes Locais Com Três Densidades Populacionais

Abstract

RESUMO - O objetivo foi avaliar a produção de biomassa e a composição física e química da planta de três híbridosde milho simples (P2530H, P30R50H e P30B39H) associadas a três densidades de plantio (60, 70 e 80 mil plantas ha-1) e três locais de cultivo (Local A, B e C). De forma isolada, as maiores produções de biomassa seca e de grãos, respectivamente, foram observadas na densidade de 80 mil plantas ha-1 (30.067 e 14.020 kg ha-1) e no local C (30.157 e 13.895 kg ha-1). Com relação aos híbridos estudados, houve influência do local de cultivo em que o híbrido P2530H foi superior para produção de biomassa seca e de grãos nos locais A e C (28.600 e 31.485 kg ha-1) e o híbrido P30B39H no local B (30.356 e 14.760 kg ha-1). Quanto à avaliação bromatológica, o local B gerou os maiores teores de proteína bruta (7,00%), matéria mineral (2,74%), fibra em detergente neutro (65,33%) e fibra em detergente ácido (36,10%), enquanto obteve os menores teores de nutrientes digestíveis totais (62,57%), comparado aos locais A e C (65,85 e 65,47%, respectivamente). De maneira geral, a densidade de cultivo não alterou os valores nutricionais das silagens dos diferentes híbridos de milho e locais de cultivo. Palavras-chave: altitude de cultivo, produção de biomassa seca, fibra em detergente neutro, NDT. HYBRID PERFORMANCE FOR MAIZE SILAGE CULTIVATED IN DIFFERENT PLACES WITH THREE POPULATION DENSITIESABSTRACT - The aim of this work was to evaluate the performance of three maize hybrids (P2530H, P30R50H e P30B39H) with three population densities (60, 70, and 80 000 plants ha-1) in three grown locations (A, B e C). In isolation, the greater dry biomass and grain yield, respectively, were observed in the density of 80,000 plants ha-1 (30,067 and 14,020 kg ha-1) and place C (30,157 and 13,895 kg ha-1). Regarding the hybrid, there was a direct influence of the local cultivation, and hybrid P2530H had the higher dry biomass and grain production in the location A and C (28,600 and 31,485 kg ha-1), and the hybrid P30B39H on location B (30,356 and 14,760 kg ha-1). In the bromatological assessment, the location B obtained the highest CP (7.00%), MM (2.74%), NDF (65.33%) and ADF content (36.10%), while it had the lower levels of TDN (62.57%) compared to locations A and C (65.85 and 65.47%, respectively). In general, the plant density did not change the silage nutritional values in maize hybrids associated with different places. Keywords: sowing altitude, dry biomass, neutral detergent fiber, TDN.

Evaluation of corn hybrids for silage grown in different locations

“…The hybrid P2866H had the highest number of yellow leaves compared to hybrids P3456H, P30R50VYH and P4285YHR (4.3, 3.4, 3.0, and 3.3, respectively), again having the greatest variation between minimum and maximum values among them. The smaller number of yellow leaves found in the hybrids P3456H, P30R50H and P4285YHR can be considered an indication of good stay-green (Neumann et al, 2018), which can result in a larger harvest window due to greater hydration during the reproductive phase and/or grain fill. The early yellowing of leaves can also be linked to leaf diseases and considering that there are more resistant hybrids than others in the natural control of these diseases (Malinovsky et al, 2014), it's possible that the hybrid P2866H is less tolerant to them than others evaluated.…”

Desempenho Agronômico Da Cultura Do Milho Sob Diferentes Arranjos Espaciais No Nordeste Brasileiro

“…Tabela 3. Altura de planta (AP), altura de inserção de espiga (AIE), diâmetro de colmo (DC) e matéria seca total (MST) em função da população de plantas e espaçamento entrelinhas na cultura do milho Neumann et al (2018) também observaram que a densidade populacional não alterou as variáveis altura de planta e inserção da primeira espiga. Já Fantin et al (2016) verificaram que menores densidades de plantas reduzem a altura da planta e favorecem o engalhamento, devido à maior entrada de luz no dossel, o que não foi observado neste trabalho.…”

Agronomic performance and chemical composition of silage from corn hybrids grown in southern Rondonia

“…Fresh matter yield is a variable that is directly affected by the height at which plants are cut and by the vegetative cycle, which makes it complex and dynamic compared with the results of studies that have worked with cutting heights and production cycle different from those adopted in the present study. Neumann et al (2018) report that the hybrid that has the highest grain production combined with a good percentage of leaves is able to result in a silage with significant energy and fermentative quality, considering the influence of carbohydrates on the fermentation process. Paziani et al (2009) also found a positive correlation between plant height and higher fresh matter production and between height and better digestibility of stem and whole plant in taller plants, in addition to dry matter yield above 50 t/ha.…”