Evaluation effect of insecticides pretreatments at different temperatures on germination and development of tow cultivars of glaucous and delineate cotton seeds in laboratory and field conditions

In order to evaluate of effect the precursors of insect pesticides at different temperatures in laboratory on germination characteristics and seedling growth of downy and de linter seeds of two cotton cultivars, this research was conducted in as a factorial experiment with four-factor in the form of completely randomized design (CRD) with four replications in Seed technology laboratory of Kashmar University Jihad Institute in Kashmar in 2019-2020. In factorial experiment, the first factor includes two types of seeds (downy and de linterseeds) and the second factor is the type of cultivar (Varamin and Khorshid cultivar), the third factor is temperature at four levels (18, 20, 22 and 24 oC) and the factor Fourth, insecticide application at three levels (control, Gaucho and Cruz). The results also showed the simple effect of cultivar, temperature, insecticide and also the interaction of seed and cultivar type, effect of seed and temperature type, effect of seed and insecticide type, effect of cultivar and insecticide, effect of temperature and effects of combined cultivar, seed type and insecticide on percentage of germination and simple effect of cultivar, temperature, insecticide and also the interaction of seed and cultivar type, effect of seed and temperature type, effect of seed and insecticide type, effect of cultivar and insecticide, effects of combined cultivar, seed type and insecticide on seedling length at the probability level of 1% were significant. The results of the average comparison showed that the highest seedling length (74/16 cm) was related to de-linter seeds of Varamin cultivar with Gaucho application and lowest the seedling length (12.44 cm) was related to de-linter seeds of Khorshid cultivar with out insecticide application. The results showed that the highest percentage of germination (93.98%) was related to de-linter seeds of Khorshid cultivar and also downy seeds with Gaucho (93.43) application. Generally, in order to produce seeds with a high germination percentage, Khorshid seeds and application of Gaucho and to increase SV II index Varamin cultivar in the first crop with application of Gaucho was recommended.