Combining Ability for Nitrogen Use in a Selected set of Inbred Lines from a Tropical Maize Population

E.E.G Gama,S.N Parentoni,I.E Marriel,A.C Oliveira,P.H.E Ribeiro,P.E.O Guimarães,M.X Santos,C.A.P Pacheco,W.F Meireles

doi:10.18512/1980-6477/rbms.v1n3p68-77

Abstract

Combining Ability for Nitrogen Use in a Selected set of Inbred Lines from a Tropical Maize Population

Highlights

RESUMO - Tolerância, em vez de resistência, é um mecanismo de resposta das plantas que tem sido buscado por melhoristas de milho, para cultivos com baixos níveis de nitrogênio
Data were collected for ear yield (EY), plant height (PH), ear height (EH), number of root and stalk lodge (NRSL), and prolificacy (Prol)
Nitrogen treatment had a significant effect on ear yield (EY), plant height (PH), ear height (EH), and prolificacy (Prol) traits (Table 1).Yield reduction under low nitrogen level (N0) in comparison to higher nitrogen level (N1) treatments, in terms of average EY, ranged from 1206 kg ha-1 to 2080 kg ha-1 for lines and from 4346 kg ha-1 to 6730 kg ha-1 for the crosses

Summary

Introduction

RESUMO - Tolerância, em vez de resistência, é um mecanismo de resposta das plantas que tem sido buscado por melhoristas de milho, para cultivos com baixos níveis de nitrogênio. Os resultados deste estudo indicam o potencial a ser explorado com o uso de linhagens promissoras, em programa de melhoramento focado no desenvolvimento de híbridos eficientes na utilização do nitrogênio. A maize cultivar with genetic potential to use N efficiently could produce economically in poor soils with low levels of fertilizer applications or high yields with better inputs of fertilizers due to its capacity to utilize N efficiently. Trials conducted at low yielding environments have a higher frequency of producing statistically nonsignificant differences, or having a larger coefficient of error variation than trials conducted under high yielding environments This is because the error variance usually does not decrease as much as the genetic variance when going from high to low yielding environments (Bänziger et al, 1997). The objectives of this work were to evaluate the N use efficiency of inbred lines and determine the relative importance of general and specific combining ability for N efficiency by using diallel crosses

Objectives

Methods

Results

Conclusion