GROWTH AND DEVELOPMENT OF MOMBASSA GRASS GROWN IN FULL SUN AND SHADE UNDER NITROGEN LEVELS

Tiago Barbalho André,Antonio Clementino Dos Santos,Leonardo Bernardes Taverny De Oliveira

doi:10.13083/reveng.v28i.932

Tiago Barbalho André, Antonio Clementino Dos Santos + Show 1 more

Open Access

https://doi.org/10.13083/reveng.v28i.932

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Abstract

The objective of this work was to evaluate the effects promoted by full sun and natural shading (25%) enviroemnts , under the productive components of Panicum maximum cv. Mombasa grown in diferent levels of nitrogen (0, 25, 50, 100 kg ha-1 cycle-1 ). Urea was used as nitrogen source, applied on the surface. This study evaluated the following variables: number of total leaves (NTL), number of green leaves (NGL), number of dead leaves (NDL), leaf lifespan (LLS), sheath length (SL), stem elongation rate (SER), Phyllochron (PHYL), leaf appearance rate (LApR), leaf elongation rate (LElR), leaf senescence rate (LSR), average length of leaf blade (ALLB), leaf area index (LAI) and tiller population density (TPP). The shaded environment provided better conditions for sheath length and leaf elongation rate, however in full sun the tiller density was higher.

Highlights

Forage for use in in silvopastoral system should be chosen based on the tolerance and persistence characteristics in shaded environments, due to the occurrence of physiological adaptations of the plant, such as anatomical and specific leaf area changes, stem and leaf elongation to capture more available light, providing survival and acclimatization by means of light intensity variations, ensuring forage production
The average number of total leaves (NTL) in the six cycles of the sun environment, estimated by the regression equation, was significant (p
Under shading, the forage presented a linear decrease of 1 kg of nitrogen to 0.0014 leaf cycle-1 (p

Summary

Introduction

Forage for use in in silvopastoral system should be chosen based on the tolerance and persistence characteristics in shaded environments, due to the occurrence of physiological adaptations of the plant, such as anatomical and specific leaf area changes, stem and leaf elongation to capture more available light, providing survival and acclimatization by means of light intensity variations, ensuring forage production. A focus on leaf emission and expansion becomes crucial to define specific grazing methods to this type of environment. The use of forage plants in pasture is a complex and interdependent process and aims mainly at maximum leaf production to achieve the maximum management of grazing animals. Understanding the main morphophysiological factors that are directly associated with the potential for conversion of biomass to animal product, becomes essential to respect the ecophysiological relationships of the ecosystem (SILVA et al, 2009)

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