This study was undertaken to evaluate the effects of different row spacings and planting populations on dry matter yield, nutritive value, and predicted milk yield of BRS 658 forage sorghum hybrid growing in Brazilian conditions. A late relative maturity forage sorghum [Sorghum bicolor (L.) Moench; 110 d-115d to soft dough stage; BRS 658 – Embrapa] was planted at 3 row spacing (0.5, 1.0 and 1.5 m) and at 3 planting population (50 x 103, 100 x 103, and 150 x 103 plants.ha-1). Treatments were arranged in a randomized complete block design in a 3 x 3 factorial arrangement, using 4 replicate plots per row spacing x plant population combination. At harvest, weights of whole-plant sorghum forage were obtained to calculate DM yields. Chemical composition was assessed by performing wet chemistry analysis. Plant height, stem diameter, and harvest were performed 110 days after sowing (DAS). Estimated milk yield per unit of forage and per hectare were calculated using Milk2006. Summative equations were used to predict TDN and NEL. Yield of wet and DM forage sorghum exhibited a negative quadratic response as row spacing increased, reaching the maximum yield response at row spacing of 1.23m and 1.22m, respectively. In addition, negative linear effect was detected for both wet and DM sorghum forage yield as planting density increased. Regarding agronomic measurements, sorghum height exhibited a negative linear pattern as plant density increased. Otherwise, stem diameter increased as planting density increased. Whole-plant sorghum forage DM content decreased linearly with increasing planting density. Conversely, ashes increased linearly as planting density increased. Neutral detergent insoluble protein exhibited a positive quadratic effect with increasing planting density, reaching the minimum value when planting density was 104.2 x 103 plants.ha-1. Finally, a negative quadratic effect for predicted milk yield per hectare was also observed with increasing row spacing, whereas the maximum milk yield per hectare value was detected when row spacing was 1.20m. In conclusion, taking into account a subtropical climate, the ideal row spacing and planting density recommendation for a high yield and nutritional quality sorghum forage are 1.2 m and 104 x 103 plants.ha-1, respectively.
The objective of this research was to evaluate the forage production, the bromatological composition of black oat in consortium with vetch when submitted to nitrogen fertilization in above sowing system in the Tifton 85 pasture. The experiment was conducted at the experimental farm of the Pontifical Catholic University of Parana, Campus Toledo-PR. The experimental design used was random blocks with four treatments and five repetitions and the treatments consisted of: only oat, oat consorted with vetch, oat with nitrogen fertilization and oat consorted with vetch and nitrogen fertilization. Were evaluated the bromatological composition (CP, NDF, ADF, LIG, EE DM, MM) and the forage yield in the consortium of oat with vetch and/or nitrogen fertilization. The results obtained to the bromatological composition indicate that the application of nitrogen on the surface of the forage increased production with an average of 3.922 kg ha -1 in the second year. The nitrogen fertilization also influenced in the medium contents of crude protein (CP) with 18.56% in the first year. The increase of nitrogen in the parcels showed meaningful results for the first year (P < 0.05) in the contents of dry matter with average value of 18.95%. The introduction of black oat consorted with vetch and with a nitrogen fertilization in above sowing in the crop of tifton 85 during the winter period provides an increase in the yield kg ha -1 and when the vetch was used it happened an increase in the contents of crude protein and dry matter in the bromatological composition of the forage.
The objectives of the present work were to evaluate the effects caused by defoliation at different levels in the corn crop, evaluating the agronomic characteristics and yield of maize. The experiment was conducted in the period from September to January, harvest 2016/2017. The experimental design was a randomized block, consisting of five treatments composed of different levels of defoliation of corn plants with four replicates: T1: Witness, without defoliation of plants; T2: Removal of all leaves of the plant; T3: leaves only in the lower third of the plant; T4: Leaves only in the middle third of the plant; T5: Leaves only in the upper third of the plant. Defoliation procedures were performed at the beginning of the VT reproductive stage of maize. The following parameters were evaluated: Spike insertion height; Diameter of the stem; Ear length; Spike diameter; Number of rows of grains on the spike; Number of grains in row; Final Productivity; Weight of a thousand seeds. The results were significant in almost all analyzed variables, where superior results were obtained by the T1 control, followed by T4. It was concluded that the best results were obtained by the control in which there was no defoliation, but there was no significant difference with the results obtained by the treatment in which there were only leaves in the middle third of the plant. From these results it can be affirmed the great importance of the median leaves above and below the spike insertion.
The present had as its objective to evaluate the response of dry mass total yield, and bromatological composition of the forage, submitted to different nitrogen doses, applied as swine waste in the pasture of Cynodon dactylon cv. ‘Vaquero’. The study was developed during the period of November 2017 until March 2018, in the experimental area of the ‘Pontifícia Universidade Católica do Paraná’, campus Toledo, located in the western region of Paraná, under latitude 24º43′13″ S and longitude 53º47′01″ W. The experimental design adopted was of randomized blocks with six treatments (0, 50, 100, 150, 200 and 250 kg ha-1) constituted by crescent doses of nitrogen as swine waste, with five replicates, totalizing 30 experimental plots. It was studied the dry mass yield (kg ha-1), crude protein (CP), dry mass (DM), neutral detergent fiber (NDF), acid detergent fiber (ADF), insoluble nitrogen in neutral detergent (NDIN), insoluble nitrogen in acid detergent (ADIN), lignin, ether extract (EE) and mineral matter (MM). It was verified that the N doses influenced in the dry mass yield of the forage, because it reached a productivity of 4520.57 kg ha-1 in the dry mass. The highest crude protein content of ‘Vaquero’ was obtained with the dose of 250 kg ha-1 of nitrogen, in which was observed a content of 13.72 g kg-1 of CP in the dry mass. The different nitrogen doses, applied as swine waste in the pasture of grass ‘Vaquero’, have an influence in the bromatological composition and in the dry mass yield, causing an increase in the forage contents of crude protein (CP), dry mass (DM), ether extract (EE), in forage produced under four cutting periods. The increase in the nitrogen doses improves the nutritional quality of grass ‘Vaquero’, once it causes decreases in the NDF and ADF content and increases in the CP and DM content.
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