Search

The objective of this work was to evaluate the productivity of maize dry matter in the consortium with forage or in single cultivation, oats + ryegrass in succession and the physical attributes in a Red Nitosol. The experiment was conducted in Concórdia - SC in the agricultural years 2016/2017 and 2017/2018. The design was a randomized block with 5 replications, consisting of the treatments: T1 - Single maize; T2 - Maize + Pigeon pea forage (Cajanus cajan); T3 - Maize + Urochloa ruziziensis; T4 - Maize + Pigeon pea forage + U. ruziziensis, T5 - Pigeon pea forage and T6 - U. ruziziensis single. The dry mass productivity (PMS) of maize, forage and oats + ryegrass in succession was determined. Also, the Rapid Diagnosis of Soil Structure (DRES) and the Mechanical Resistance of Soil to Penetration (RSP) were carried out after two years of cultivation. The presence of U. ruziziensis and / or Pigeon pea did not affect the dry matter yield of maize in both harvests. The highest PMS of oats were found in the plots following single maize and the smallest for the second crop, where treatments with U. ruziziensis followed. For RSP, no significant differences were found in consortia and single crops. The treatments with U. ruziziensis obtained better indexes of structural quality. The corn consortium with Urochloa ruziziensis, in addition to not reducing silage productivity, provides forage availability in the autumn empty period, as well as improving soil attributes. [ABSTRACT FROM AUTHOR]

The objective in this study was to characterize the productive potential, monthly yield distribution, and forage plantpart and botanical composition of black oats and annual ryegrass under harvest strategies in São Paulo. The experimental design was completely randomized with treatments corresponding to the combination among stand composition (exclusive oats, exclusive annual ryegrass, or oats + ryegrass, O+R) and harvest strategies (at 95% LI or every 30 days of regrowth, FIXED), in a factorial arrangement with three replications. Stands managed by LI accumulated 1580kg DM ha-1 harvest-1, and those managed by FIXED 2020kg DM ha-1 harvest-1. Leaf proportion was higher in ryegrass (70%), followed by O+R (64%) and oat (52%). Swards managed by LI had higher proportion of leaves and less stem than those harvested at FIXED intervals. The proportion of ryegrass was higher under the LI management (64%), than under the FIXED (70%). Over time there was the replacement of oats by ryegrass in the mixed canopy composition. Exclusive ryegrass stands are recommended. Both harvest strategies can be adopted for these winter forages in integrated systems of agriculture and livestock. [ABSTRACT FROM AUTHOR]

This trial aimed to evaluate the nutritive value of white oat (IPR 126), black oat (IAPAR 61), common black oat, common annual ryegrass and dual purpose wheat (BRS Tarumã), sowed on different dates (4th and 24th April, May 14th, and June 3rd 2008). Randomized completely block design was used with four replicates. Cutting regime was done according to sward surface height target, varying to each forage species, as well as stubble height. Harvested material was analyzed in terms of crude protein content (CP), neutral detergent fiber (NDF) and total digestible nutrients (TDN). There was significant interaction between sowing dates and forage species over all nutritive variables analyzed. CP and TDN of oats and ryegrass were higher in early sowing dates, and NDF content increased in the latest sowing dates. On the contrary, BRS 'Tarumã' had lesser nutritive value in earliest sowing date. [ABSTRACT FROM AUTHOR]

Common bean yield and the suppressive effect of winter cover crops on summer weeds. The effect of the winter cover crops rye, oat, ryegrass, vetch and fodder radish (and their mixtures) in no-tillage systems was investigated on soil cover, cover crop biomass and summer weed biomass during the critical competition stage with common bean. Bean yield was also evaluated. The experimental design was randomized complete blocks and four repetitions. The highest soil cover during winter was observed in the treatments rye + vetch, rye + vetch + fodder radish and oat + vetch. The highest values of cover crops biomass production were observed in the treatments rye + vetch + fodder radish. Weed suppression was higher in the ryegrass monoculture and in the rye + vetch + fodder radish association, and there was no correlation between cover crop biomass and summer weed suppression; the best bean yields were achieved with the following treatments: ryegrass in monoculture, oat in monoculture and rye + vetch, producing 1,950, 1,730 e 1,790 kg ha-1 respectively. The monocultures of ryegrass and oat showed the lowest costs with seeds and the highest economic returns. [ABSTRACT FROM AUTHOR]

This study had the objective to evaluate Pampa Corte Model's reliability in predicting beef cattle performance in grazing systems. For this purpose, model's predicted values were compared to available data base of published papers. Correlation coefficients above 90 % were obtained between simulated and real data in all tested alternatives. Model's data base should be enlarged by forage productivity data in different climatic conditions. Mixtures of Italian ryegrass and oat need more studies to obtain qualitative parameters (crude protein degradability and neutral detergent fiber), as well, animal performance in the single pastures of oat or Italian ryegrass. [ABSTRACT FROM AUTHOR]