RELAÇÃO DO TAMANHO DE SEMENTES DE SOJA TRATADAS INDUSTRIALMENTE COM NEMATICIDA NA QUALIDADE FISIOLÓGICA

Abstract

As part of the management of phytonematoids in soybean cultivated areas, industrial seed treatment (TSI) is used. However the IST can affect the seeds germination and vigor during the store period in warehouse and reduce the efficiency during planting due to the industrial application in seeds of different size, in this case P1 and P2 varying 1 mm between them. The objective of this work is to evaluate the loss of quality of soybean seeds in germination and vigor during the storage period, being this Experiment 1, and Experiment 2 verified the efficiency of the nematicide after planting, both as a function of the cultivar, size and IST during the 4-month period. After the bagging, the seeds were stored in the course of 4 months, and samples were sent to the analysis laboratory to perform the germination and vigor (aging tests) with 4 replicates each. And in the 4th month of storage the seeds were sent to planting. Experiment 1, germination and aging tests performed at IF Goiano Campus Urutaí, a 2 x 2 x 2 factorial analysis was subdivided into 5 times since 0 - month, with 2 cultivars 98Y30 and 98Y12, 2 P1 and P2 sieves, with IST or without IST (NT) and 5 months of storage. In the analysis of variance, the main factor was the storage time, influencing both germination and vigor. However, for germination, in the 1st and 2nd months there was no significant difference of the treatments, being observed a difference (p <0.05) from the 3rd month. For vigor, with the passage of months the seed aged significantly for all treatments analyzed. The influence of seed size treated with nematicides on the results on germination and vigor interact with time. Experiment 2, Pratylenchus brachyurus quantification in soil and roots and productivity, installed in a property in the municipality of Ipameri-GO, using a randomized block design (DBC) in a 2 x 2 x 2 factorial scheme with 3 replicates, 2 seed sizes (according to the P1 and P2 sieves of UBS) and 2 varieties (98Y12 and 98Y30), total of 24 plots, Each plot will consist of 5 rows of 6 meters in length spaced 0.5 meters. The two end lines will be considered as border and one to evaluate the productivity and 3 lines to evaluate the population of the nematode at 45 and 90 days after planting. Extraction followed the Jenkins methodology (1964) for soil nematode extraction and Coolen & D'Herde (1972) for root nematode extraction. A multivariate biplot analysis was performed for the results found. For productivity, the LSD test was applied for multiple comparisons between averages. For the evaluated seed sizes, there was no difference in the efficiency of the nematicide (with or without) used in the industrial seed treatment. For productivity, there was a significant difference in the materials that were not treated, that is, they did not contain nematicide. The materials with TSI are becoming more productive.