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Shading and Thinning Effects on Multi‐ and Standard‐Floret Winter Wheat
Author(s) -
Jedel P. E.,
Hunt L. A.
Publication year - 1990
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1990.0011183x003000010029x
Subject(s) - anthesis , shading , biology , thinning , cultivar , agronomy , crop , field experiment , biomass (ecology) , horticulture , grain yield , zoology , art , ecology , visual arts
Grain set in a crop is related to many factors, including genotype and assimilate supply. This study was conducted to examine differences in grain set in two winter wheat ( Triticum aestivum L.) cultivars differing in spike characteristics. The multiflorous cultivar Benni and the standard floret cultivar Houser were investigated in field studies at Elora and Woodstock, Ontario, Canada. In 1984, three 50% of full daylight shading treatments were imposed (PRE: a 2 wk period prior to anthesis; POST: 2 wk following anthesis; PRE + POST: 2 wk prior to anthesis plus the 1 wk following anthesis). In 1985, a postanthesis thinning treatment (THIN), in which stem number was reduced by 50%, was added. In 1984, Houser had reduced total aboveground biomass and grain yields per meters squared with the PRE and PRE + POST treatments. Grain yield reduction was associated with reduced kernel number per meters squared. For Benni in 1984, shading treatments affected neither total biomass nor grain yield. In 1985, all shading treatments reduced total biomass and grain yield for Houser, while treatments PRE and PRE + POST reduced total biomass and treatments PRE + POST and THIN reduced grain yield for Benni. Grain yield reduction for Houser was associated with reduced kernel weight for all treatments and reduced kernel and spike numbers per meters squared for treatment PRE + POST. Reduced grain yield for Benni was associated with reduced kernel numbers for treatments PRE + POST and THIN and spike numbers for treatment PRE + POST. The responses, usually manifest in a similar aboveground biomass production under different shade conditions, suggest that some internal limitation was present.