Behavioral variations due to effects of day length on yield and related characteristics of some Brassica juncea L. genotypes under hot humid continental conditions
Abstract
The search for new oil seed crops in the low rainfall drought Central Anatolia has attracted researchers to profitable alternative crops like Brassica species in recent years. Breeding of a suitable oilseed crop for the Central Anatolia will provide a new rotational break for controlling soil borne diseases, weeds and drought stress that are very difficult to manage with prevailing agricultural practices. Brassica juncea L. is an important oilseed crop and is newly introduced in Turkey. This study was conducted to evaluate the developmental responses to 4 different day lengths and cosequently climatic conditions to screen 38 B. juncea genotypes for some oil yield related agronomic charachterisitics under hot humid climatic conditions of Yenimahalle, Ankara, Turkey. It was noted that early and delayed sown genotypes had synchronization towards flowering in the month of June with 15 h 01 min to 15 h to 39 min day length photoperiod. The results showed a significant effects of sowing dates day lengths and consequently climates upon genotypes for oil yield and agronomic traits. The maximum mean crude oil yield (38.4 g m-2) was obtained from AK genotype. The results clearly describe that early sowing provides long period of vegetative growth with increased intake of photosynthates to plant sinks; that is not possible under late sowings.
Keywords
Brassica juncea L., Crude oil content, Day length, Yield, Sowing dates
Thanks
The author acknowledges the role of The Central Field Crops Research Institute Yenimahalle, Ankara, Turkey for facilitating in carrying out the research. The author is grateful to Prof. Dr. Khalid Mahmood KHAWAR, Department of Field Crops, University of Ankara for helps for this study.
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