The amount of chlorophyll a+b, extinction coefficient and Leaf Area Index amounts of winter rapeseed (Brassica napus L.) by boric acid application

The study chlorophyl a+b amount and extinction coefficient are very important elements of photosynthesis amount and efficiency. In order to study the Effect of Boric acid spraying levels on chlorophyll a+b content and extinction coefficient of winter rapeseed (Brassica napus L.) cultivars an experiment carried out in factorial design in the basis of randomized complete blocks with 4 replications in 2007. Bor spraying treatments from Boric acid source in three levels: 0, 1.5/1000 and 3.0/1000 and Rapeseed cultivars in 3 levels: Licord, Modena and SLM046 were considered.The Results showed that simple effect of cultivars, bor spraying element and interaction effect of them on chlorophyll a+b content and extinction coefficient had significant difference. In this case Licord cultivar with 6.62 mg/lit produced maximum amount of chlorophyll a+b content and with 0.46 highest amounts of extinction coefficient and SLM046 cultivar with 5.54 mg/lit and 0.34 showed the lowest amounts of chlorophyll a+b content and extinction coefficient in three average bor spraying amounts alternatively.The effect of bor element spraying amounts on mentioned characters showed that 1.5/1000 and 3/1000 Bor spraying with 6.54 and 6.51 mg/lit had the highest amounts of chlorophyll a+b content and with 0.46 and 0.41 produced minimum amounts of extinction coefficient.The interaction effect of experimental factor on mentioned characters showed that, 3/1000 bor spraying in Licord with 7.25 mg/lit and 0.52 gained the highest amount of chlorophyll a+b and extinction coefficient.