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|Title: ||Optimizing germination of seven Mediterranean crops|
|Authors: ||Andrade, José|
|Keywords: ||Germination rate|
spread of germination
|Issue Date: ||2019|
|Publisher: ||Journal of Crop Improvement|
|Citation: ||José A. Andrade, Jorge Cadima & Francisco G. Abreu (2019):
Optimizing germination of seven Mediterranean crops, Journal of Crop Improvement, DOI:
|Abstract: ||Crop establishment is a major factor determining crop productivity.
Successful crop establishment requires generalized, fast
and concentrated germination. Final germination counts (size),
speed and spread depend on soil temperature and moisture.
This work seeks to determine, under non-limiting water conditions,
optimal temperature ranges for the germination of seven
common Mediterranean crops, viz., pea (Pisum sativum L.),
lupine (Lupinus luteus L.), chickpea (Cicer arietinum L.), broad
bean (Vicia faba L.), sunflower (Helianthus annuus L.), corn (Zea
mays L.) and sorghum (Sorghum bicolor (L.) Moench).
Experiments used a thermogradient plate, with temperatures
monitored by Cu-CuNi thermocouples. Thermal ranges [To1
sz] along which germination counts are nearly maximized
were identified by the successful use of a flattened bell curve
function. Thermal ranges [To1
sp], where germination
speed is maximized, were defined using the plateau-shaped
model for rate of germination vs. temperature relationship.
sd], along which dispersion is nearly minimized,
were successfully identified using even-degree polynomials.
The intersection of these three thermal ranges provided
an optimal temperature range (OTRG) for the germination of
each crop. In most cases, OTRG begins at the lowest temperature
that guarantees a maximum germination rate (To1
ends at the maximum temperature that ensures minimal dispersion
sd). The endpoints and length of the OTRG were
found to be crop-dependent. For each crop, OTRG also
depended on the fraction of germinated seeds and on the
level of dispersion that is considered acceptable. The results
allow farmers to choose between different crops and to optimize
|ISSN: ||1542-7528 (Print) 1542-7536 (Online)|
|Appears in Collections:||MED - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica|
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