Physiological Quality of Pigeonpea Seed after Application of Desiccant Herbicides

Abstract

The pre-harvest application of herbicides may impair seed quality. This way, this paper was conducted to evaluate the effects of the application of desiccant herbicides on the physiological quality of pigeonpea seeds. Six batches of seeds from plants desiccated with glyphosate were evaluated at doses: 1.125 (B1), 1.5 (B2) and 1.875 L·ha −1 (B3); and Gramocil (20% Paraquat + 10% Diurom) at doses: 1.5 (B4) and 2 L·ha −1 (B5), and a control which received no application (B6). Seed viability was assessed through the germination standard test, and vigor through the first germination count, accelerated aging, electrical conductivity, seedling length, seedling dry matter and biomass density tests. The experimental design was the completely randomized, with four replications. Data were submitted to variance analysis, and when significant effects were observed, the ScottKnott test was carried out at 5% probability using the SISVAR 5.1 software. The results showed that: a) the application of 1.875 L·ha −1 of glyphosate was harmful to pigeonpea seed viability and vigor, evaluated through the accelerated aging test; b) applications of glyphosate in a 1.875 L·ha −1 dose and Gramocil in 2 L·ha −1 resulted in low vigor according to the electrical conductivity test of seeds; and c) the seed vigor measured by the first count, seedling length, seedling dry matter and biomass density test was not influenced by the type of desiccant applied.

Influence of Growth Regulators Application on Seed Development and Maturation in Pigeonpea (Cajanus cajan (L.)

“…When growth regulator is used in appropriate concentration influences the plant architecture in a typical fashion and improve the yield potential. Similar reports have been made by Guimaras et al [14] in pigeonpea, Sheng et al [15] in cotton, Garai and Datta [16] in greengram, Berova and Zlatev [17] in tomato. Foliar application of Brassinolide @ 0.25 ppm significantly increased flower: fruit ratio, pollen viability, pod weight, pod length and reduced days to maturity (65 days) in greengram [18].…”

Influence of Water Content on the Quality of Pigeonpea Seeds

“…[9] analyzing the physiological quality of pigeonpea seeds during the storage and in different packages observed lower values for electrical conductivity for the kraft bag (ranging from 80 and 100 µS•cm −1 •g −11 ) in relation to this research. [17] evaluating physiological quality of pigeonpea seed after application of desiccant herbicides observed lower values for electrical conductivity to zero storage time observed in this work (53.2 µS•cm −1 •g −1 ).…”