Recycling the F₂ generation of three commercial hybrid rice varieties at two nitrogen levels

Issue Date

12-2008

Abstract

The yield of F₂ generation of local commercial rice hybrids has not been adequately evaluated. Hence, the "no recycling" recommendation for F₂ hybrids needs at least quantitative basis. A field experiment was conducted during the dry and wet season to evaluate the yield of the F₂ generations of three commercial hybrid rice varieties under two levels of nitrogen (N) application. PSB Rc 72H, NSIC RC 114H and NSIC Rc 116H were evaluated at 60 and 120 kg N ha¯¹ during dry season, and NSIC Rc 114H and NSIC Rc 116H at 50 and 100 kg N ha¯¹ during wet season. Regardless of variety and generation, grain yield was significantly greater at the higher N than in the lower N level during the dry and wet season. The effect of N level x variety-generation interaction on yield was not significant. Across N levels, the yield gaps between the F₁ and F₂ generations ranged 11-25% during dry season and 4-15% during wet season. The F₂ generation of NSIC Rc 114H showed the lowest yield depression in both seasons, while, the F₂ generation of NSIC Rc 116H had the highest yield depression, which was partly attributed to non-uniform maturity. Recycling F₂ generation of NSIC Rc 114H during the wet season was agronomically feasible because i) the yield advantage of the F₁ hybrid over the F₂ generation (109 kg ha¯¹ using 50 kg N ha¯¹ and 341 kg ha¯¹ using 100 kg N ha¯¹) was not significant, and ii) the forgone net return (PhP 1,242 ha¯¹ at 50 kg N ha¯¹ and PhP 836 ha¯¹) attained from using F₂ seeds.

Source or Periodical Title

Philippine Journal of Crop Science

ISSN

0115-463x

Volume

33

Issue

3

Page

45-55

Document Type

Article

Frequency

tri-quarterly

Physical Description

tables

Language

English

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