Abstract
The variation in population density in a corn crop can positively, negatively or neutrally affects plant productivity depending on the productive potential of the area. The aim of this work was to evaluate the effects of the variation in corn seed dosage on crop yield, and define from which percentage of variation the productivity of the sown line is affected negatively. The experiment was installed at FCAV-UNESP, in Jaboticabal (SP), Brazil. Twelve variations on plant population were evaluated, ranging from -27% to 27%, varying with a frequency of 4.5%. The morphological and productive characteristics of each treatment were evaluated through regression analysis. Each 1% of negative variation on seed dosage was lost 1.06% in corn yield. Positive variations, however, presented changes that were 0 to -2.59%. Negative variations on seed dosage reduced corn productivity by up to 28%. The positive variation affects the productivity of the crop in a less accentuated way, with a reduction in productivity that reaches 2.59% in the largest variations and may even cause positive productivity results depending on the maximum potential of the area.
Highlights
Plant density is a determinant factor in the productivity of several crops, especially in corn, which does not have the plasticity that other crops should compensate for the absence of plants (Silva et al, 2016)
It was observed that the height of the plants began to increase again, demonstrating that the negative variation in population density causes growth in plant height as well as the positive variations from 9%
This result may have occurred because apparently the maximum population potential was subjugated, and it was considered that the ideal population density was only 60,000 ha-1 plants, the results show that the maximum potential would be approximately 66,000 ha-1 plants
Summary
Plant density is a determinant factor in the productivity of several crops, especially in corn, which does not have the plasticity that other crops should compensate for the absence of plants (Silva et al, 2016). The variation in population density in a corn crop can positively, negatively or neutrally affects plant productivity depending on the productive potential of the area (Assefa et al, 2016). In addition to sowing speed, there are other factors that contribute to the existence of variations in seed dosage throughout the operation, but which, unlike the machine’s travel speed, cannot be controlled to avoid operating failures, such as curve seeding errors
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