Emergence of Razor Grass on the Basis of Origin and Seed Depth in the Soil Profile

A.S Marques,G.H.R Pinheiro,C.C Martins,S.R Marchi,R.F Marques

doi:10.1590/s0100-83582019370100126

A.S Marques, G.H.R Pinheiro + Show 3 more

Open Access

https://doi.org/10.1590/s0100-83582019370100126

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Abstract

ABSTRACT: Razor grass (Paspalum virgatum L) is one weed that has gain importance because of its high seed production capability, mainly when pasture fields need to be renewed. Understanding seedling emergence behavior is crucial to devise strategies to manage this weed. This trial was carried out to evaluate the emergence pattern of razor grass seedlings on the basis of seed depth in the soil profile. The experiment was conducted in a green-house in a completely randomized design, with six replications. The treatments performed in a 11 x 3 factorial arrangement: eleven seeding depths (surface, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0 and 10.0 cm) by three ecotypes (Rondonópolis, Redenção and Cacoal, Brazil). The effect of origin and seed depth was measured by number of emerged seedlings, emergence speed index, relative emergence frequency, mean emergence time and emergence synchrony of seedlings at 35 days after planting. The seeds of ecotype Rondonópolis had higher vigor than those of ecotype Redenção, which had higher vigor that the ones of ecotype Cacoal. The highest seedling emergence percentage, uniformity and speed were found when the seeds were located at the soil surface, regardless of seed origin. There was no seedling emergence when the seeds of ecotypes Rondonópolis and Cacoal were located at a depth equal to or higher than 8.0 cm; and of ecotype Redenção when they were at a depth equal or higher than 7.0 cm.

Highlights

Razor grass (Paspalum virgatum L.) is a grass that invades pasture and has high capacity of multiplication and competition with forage species
Panicles of P. virgatum containing physiologically mature spikelets were handpicked in several pasture fields located in the towns of Rondonópolis-MT, Redenção-PA and Cacoal-RO (Table 1), forming three lots named according to the origin: ecotype Rondonópolis, ecotype Redenção and ecotype Cacoal
Ecotype Cacoal had the highest value for thousand seed weight of full seeds: 1,640 g

Summary

SOCIEDADE BRASILEIRA DA CIÊNCIA DAS PLANTAS DANINHAS

EMERGENCE OF RAZOR GRASS ON THE BASIS OF ORIGIN AND SEED DEPTH IN THE SOIL PROFILE. Emergência de Capim-Navalha em Função da Origem e da Profundidade da Semente no Solo. Understanding seedling emergence behavior is crucial to devise strategies to manage this weed This trial was carried out to evaluate the emergence pattern of razor grass seedlings on the basis of seed depth in the soil profile. There was no seedling emergence when the seeds of ecotypes Rondonópolis and Cacoal were located at a depth equal to or higher than 8.0 cm; and of ecotype Redenção when they were at a depth equal or higher than 7.0 cm. MARQUES, A.S. et al Emergence of razor grass on the basis of origin and seed depth in the soil profile do solo, independentemente da origem da semente. Palavras-chave: Paspalum virgatum, ecótipo, planta daninha, pastagem, padrão emergência

INTRODUCTION

MATERIAL AND METHODS

West longitude

RESULTS AND DISCUSSION

Emergence synchrony ESI