CALENDAR ALTERATION OF SOYBEAN SOWING, IN THE RIO GRANDE DO SUL STATE, BY THE USE OF ADAPTED CULTIVARS AT DIFFERENT ENVIRONMENTS
Abstract
The sowing date is, probably, the cultural practice singly more important for the soybean [Glycine max (L.) Merrill]. The best sowing date for this oleaginous depends, mainly, on soil temperature for germination and emergency, air temperature during the whole growing cycle of the plant, photoperiod after the emergente and soil moisture on the sowing date, along fiowering and grain filling. This study aimed to define an adjustment of sowing dates for the soybean in the State of Rio Grande do Sul, Brazil taking into account the meteorological elements referred above, stages of soybean plant development and the agronomic behavior of the cultivars presently recommended for seeding in the State. The new calendar presents an amplification of the sowing period for all areas of the State. The soybean can be sowed since the end of September Iate to December 25, in Rio Grande do Sul State. However, the largest yields are obtained with November sowings.
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