Abstract
ABSTRACTThis study aimed to evaluate the influence of foliar fertilizer doses containing Mn of phenological stages of suggested application in RR soybeans, to recover management damages with glyphosate at postemergence application on seed vigor in post-harvest and post six months storage. The seeds originated from a field experiment conducted , which included two applications of glyphosate, concomitant with foliar fertilizer in growth stages V4 and V6, with 0.00, 113.50 and 227.00 mg ha-1doses of Mn2+. Germination, GSI (Germination Speed Index), electrical conductivity tests and the first count of seeds were conducted. The application of Mn did not affect the physiological quality of RR soy in postharvest. However, in post-storage, higher doses of Mn had a negative effect on tests of abnormal seedlings, GSI and electrical conductivity. The applications of Mn, regardless of the developmental stage, did not interfere in the germination and first count tests, with and without storage. The electrical conductivity test showed a higher correlation with the seed germination test in the post-harvest treatment.
Highlights
Soybean (Glycine max L.) is the oilseed crop that has presented the highest growing rate in Brazil over the last three decades
The results of variance analysis tests for the seeds at postharvest presented no statistically relevant difference (p > 0,05) among the treatments, indicating that the management used in the crop, herbicide and manganese deficiency (Mn) applications, did not cause any differences in the physiological quality of the seeds
Similar results were found by Melarato et al (2002), who worked on foliar applications and different Mn doses and stages of soybean, without storage, presenting no significant result for the product and concluding that Mn does not influence the physiological potential of seeds produced
Summary
Soybean (Glycine max L.) is the oilseed crop that has presented the highest growing rate in Brazil over the last three decades. It corresponds to about 49% of the national sowing fields (Brasil, 2013). The increase in productivity is associated with technological advances and the efficient management of the producers. The grain is the main source of vegetable protein, essential component of animal feeding production, and adding to that, its use in human feeding is increasing. Along with the increasing modernization of RR transgenic soybean crop (Randup Ready®), major changes to improve the production process are required from seed producers. The vigor tests have been used as routine tools by the seed industry to determine their physiological quality (Vieira et al, 2002)
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