Abstract
Physiological potential characterization of seed lots is usually performed by germination and vigor tests; however, the choice of a single test does not reflect such potential, once each test assesses seeds of differentiated mode. Multivariate techniques allow understanding structural dependence contained in each variable, as well as characterize groups of seed lots according to specific standards. The study aimed at evaluating variability among soybean seed lots and discriminate these lots by multivariate exploratory techniques as function of seed vigor. Experiment was performed with 20 soybean seed lots (10 lots cv. BRS Valiosa RR and 10 lots cv. M-SOY 7908 RR). Seed physiological potential was assessed by testing for: germination (standard, and under different water availability); vigor (accelerated aging and electrical conductivity); and field seedling emergence. Cluster analysis of seed lots, as well as Principal Component Analysis was performed using data obtained on all tests. Multivariate techniques allowed stratifying seed lots into two distinct groups. Principal Component Analysis showed that values obtained for variables: field seedling emergence, accelerated aging, and germination under different water availability were linked to BRS Valiosa RR; while to variables germination and electrical conductivity, were linked to M-SOY 7908 RR.
Highlights
IntroductionA limiting factor for the establishment of an adequate plant stand in the field
The use of high quality seeds is an essential component on the establishment of any farming system type; and high seed physiological quality is the most important component to ensure an appropriate plant population in the field, and allow for the expression of maximum productive potential of a given crop under a wide range of different environmental conditions.Currently, the low quality of soybean seeds is no longer r. m. barbosa et al.a limiting factor for the establishment of an adequate plant stand in the field
That the means obtained for seed moisture content before accelerated aging test (BAA) were different among distinct seed lots assessed, ranging from 11.6% (L8) and 12.6% (L3) to cv
Summary
A limiting factor for the establishment of an adequate plant stand in the field. This is due to factors such as: high genetic potential of cultivars currently marketed; supervision of seed production fields by competent bodies, associated to quality control programs; and commitment of seed producers on ensuring their product is competitive on the market. The main limiting factor to soybean production is the water availability; once water is essential to seed germination process. When soil moisture content is suitable, the seed germination process and plant emergence occur more quickly and evenly. In function of pre-determined periods for crop installation, soybean seeding may be performed in soils that do not have suitable moisture. Seeds may be subject to infection by microorganisms or to attack by soil insects; what exacerbates the problem
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