Abstract
This study analyzed the behavior of the annual ryegrass (Lolium multiflorum) BRS Ponteio and dual-purpose wheat (Triticum aestivum) BRS Tarumã with different doses of ammonium sulfate as topdressing and evaluated the exponential growth model to explain the physiological development of both species. For each species, a completely randomized design was used with four replications per treatment with 9m2 area, in which the following treatments were distributed: 0, 150, 250, 350 and 450 kg nitrogen per hectare applied as ammonium sulfate. The cumulative and adjusted productions to the exponential growth model at the end of the cycle were, respectively: BRS Ponteio 150 = 5,620; 250 = 5,920; 350 = 7,585 and 450 = 8,491 and BRS Tarumã 150 = 3,922; 250 = 5,060; 350 = 7,024 and 450 = 7,491 kg dry matter per hectare. The cultivars analyzed without nitrogen application had limited growth and showed no adjustment even to the first order linear model. The application of nitrogen decreased the interval between cuts and increased dry matter production per hectare following the exponential growth model.
Highlights
The valuation of agricultural commodities, mainly soybean (Glycine max. (L.) Merr.), has altered the land occupation in the South Region of the State of Rio Grande do Sul, due to the expansion of the oilseed, which competes with livestock production during the summer season in the Pampa Biome (Oliveira et al, 2017)
The results are presented chronologically, separated by plant species, since there was no intention to compare them, since the annual ryegrass BRS Ponteio was developed for grazing while dualpurpose wheat BRS Tarumã was genetically improved for production of pasture and grains
The lack of nitrogen decreased the production of annual ryegrass BRS Ponteio and dual-purpose wheat BRS Tarumã
Summary
The valuation of agricultural commodities, mainly soybean (Glycine max. (L.) Merr.), has altered the land occupation in the South Region of the State of Rio Grande do Sul, due to the expansion of the oilseed, which competes with livestock production during the summer season in the Pampa Biome (Oliveira et al, 2017). According to Dick, Silva, and Dewes (2015) and Ruviaro, Léis, Lampert, Barcellos, and Dewes (2015), cultivated pastures (temperate and tropical) contribute to the mitigation of greenhouse gases in the production of beef cattle in the State of Rio Grande due to the better performance of the herds. Some dual-purpose cultivars have been used only for grazing, due to the quantity and quality of the forage produced, which are due to the number of inputs applied and mainly the management. According to Henz et al (2016) the use of dual-purpose wheat for grazing allows for early cropping by minimizing and/or nullifying the effects of forage shortage in the fall
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
