Performance of three commercial maize hybrids under simulated seed recycling conditions

Abstract

Three segregating populations (F2, F3 and F 4) of three commercial hybrid maize varieties (C-818, P-3014 and IPB-911) were generated through simulated hybrid seed recycling for simultaneous evaluation against their F1 generations under favorable environmental conditions to quantify yield depression, to identify traits associated with yield depression and to determine forgone economic benefit. Of the three hybrids, only C-818 showed significant yield depression. Loss of uniformity in ear length and ear diameter, and significant reduction of shelling recovery accounted for significant yield depression. Leaf area index, number of functional leaves above the ear, stalk diameter and ear height were relatively stable. The magnitude of forgone economic benefit differed from one hybrid to another. Forgone economic benefit (PhP5,383 to PhP8, 156/ha) was highest in C-818. Recycling the F2 and F4 generations of P-3014 and IPB-911 likewise led to forgone economic benefit ranging from PhP106 to PhP1,003/ha and from Php1,521 to PhP2,832/ha, respectively. Despite yield fluctuations, profit remained positive in each crop cycle. Based on yield depression and forgone economic benefit, the segregating generations of C-818 should not have been recycled. In contrast, P-3014 was fit for the three-season hybrid seed recycling while IPB-911 was suited to only two crop cycles. Using profit as basis for decision making, recycling the segregating generations of the three hybrids for three crop cycles was economically viable.

Source or Periodical Title

Philippine Agricultural Scientist

ISSN

317454

Page

298-305

Document Type

Article

Subject

Forgone economic benefit, Segregating generation, Stability, Yield depression

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