Levels of nutrients and grain yield of maize intercropped with signalgrass (Brachiaria) in different arrangements of plants

Abstract

-Competition between maize and signalgrass can economically cripple the intercropping by the reduced yield of maize and dry matter content of the forage. In seeking to define plant arrangements which make this system more efficient, this research was held with the objective of assessing the effects of interference of densities of signalgrass (Urochloa Brizantha) on nutrition and on maize grain yield. Two field experiments were conducted in a randomized block design with four replications. Treatments were arranged similarly in both experiments, in a 2 x 4 factorial design, the first factor being the dose of Nicosulfuron herbicide applied (0 and 8 g ha ) and the second factor being the forage seeding rates (0, 2, 4 and 6 kg of seeds per hectare). The interference of signalgrass reduced foliar nitrogen, potassium and phosphorus content in maize plants intercropped with the forage. Higher values of grain yield were observed with the reduction of the spacing and the application of the recommended herbicide underdose (8 g ha -1). It was concluded that, regardless of the seeding density of U. Brizantha, reducing the maize seeding inter-rows spacing, combined with the application of an underdose of Nicosulfuron, caused a positive effect by reducing the initial forage growth, resulting in less interference of Urochloa brizantha on nutrient uptake by the maize plants and grain yield of the crop.Keywords: Nicosulfuron, competition in intercropping, cropping spacing. RESUMO -

Agronomic Performance and Photosynthetically Active Radiation Intercepted by Maize Intercropped With Brachiaria

“…The results show that modifying the spatial arrangement of plants, even in intercropping, can increase maize yield. Some authors found that, in many cases, there can be no significant difference between the yield of the alone maize cropping and intercropped with forages, which depends on the combination of several factors, including the perennial forage population, the time of its implementation and planting arrangements (Jakelaitis et al, 2006;Resende et al, 2008;Freitas et al, 2015). Over the years, the adoption of the consortium results in higher amount of straw, increases soil organic matter, and both off-season and the summer crop cultivation productivity tend to rise.…”

Study on Electrochemical Degradation of Nicosulfuron by IrO2-Based DSA Electrodes: Performance, Kinetics, and Degradation Mechanism

“…Nicosulfuron is classified as being low to moderately persistent in soil, with maximum residual levels between 0.01 and 0.02 [12]. Despite its low persistence, its residues have been reported in many matrices, such as soil [13,14], surface water [15,16], and some crops [17,18].…”

MANAGEMENT OF Urochloa ruziziensis WITH GLYPHOSATE IN INTEGRATED SYSTEM WITH GLYPHOSATE-RESISTANT CORN

“…ha -1 (T4), and standard treatment of 8 g. a.i. ha -1 of the nicosulfuron herbicide (T5), according to Ferreira et al (2007) and Freitas et al (2015).…”

“…The integration of corn and forage of the Urochloa genus is one of the best intercropping options due to the high metabolic efficiency of the species involved and the excellent adaptation of the forages to the Midwest region soils and climate, using basically the forages Urochloa brizantha and Urochloa decumbens, and the nicosulfuron herbicide is widely used as a standard tool for forage suppression (Ferreira et al, 2007;Cavalieri et al, 2008;Silva et al, 2014;Freitas et al, 2015).…”