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Titolo:
MAIZE GROWTH AND YIELD FOLLOWING LATE SUMMER HAIL
Autore:
DWYER LM; STEWART DW; EVENSON L; MA BL;
Indirizzi:
AGR CANADA,CTR LAND & BIOL RESOURCES RES,RES BRANCH OTTAWA K1A 0C6 ONCANADA
Titolo Testata:
Crop science
fascicolo: 5, volume: 34, anno: 1994,
pagine: 1400 - 1403
SICI:
0011-183X(1994)34:5<1400:MGAYFL>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
WATER;
Tipo documento:
Note
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
11
Recensione:
Indirizzi per estratti:
Citazione:
L.M. Dwyer et al., "MAIZE GROWTH AND YIELD FOLLOWING LATE SUMMER HAIL", Crop science, 34(5), 1994, pp. 1400-1403

Abstract

Leaf damage caused by hail may severely restrict photosynthate production, but estimation of yield loss is hindered by lack of an unaffected control for comparison. A field study was modified in 1990 at Ottawa, Canada, to determine the effect of maize growth stage at the time ofhail damage on harvest parameters. Hand-harvested above-ground dry matter, grain yield, grain moisture, and harvest index were compared among nine hybrids with maturities ranging from 2350 to 2800 corn heat units (CHU) and planting dates of 30 April, 16 May, and 29 May. A severehail storm occurred 28 August when some hybrid maturity x planting date treatments were at the milk stage and others were at full dent. A method of analysis was developed using above-ground dry matter accumulation at tasselling as a pre-hail indicator of yield potential to calculate the reduction in harvest dry matter and grain yield resulting from the hail storm. The reduction in harvest dry matter and in grain yield was linearly related to the CHU required to reach physiological maturity at the time of the hail storm (P < 0.10). Late-maturity hybrids were most affected by the hail storm and contributed most to these regressions (P = 0.01 and P = 0.02 for harvest dry matter and grain yield, respectively). Harvest index was not affected by the hail storm (P >0.10).

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Documento generato il 18/09/20 alle ore 17:10:57