تأثیر سطوح مختلف آبیاری بر جذب و کارآیی مصرف نور ذرت

Radiation use efficiency depends on the amount of received photosynthetic active radiation. In addition to the morphological characteristics of cultivars, crop managements such as irrigation through the effects on leaf area index and absorbed radiation, affect the radiation use efficiency. This experiment was conducted to evaluate the effect of different irrigation levels on leaf area index, dry matter accumulation, and radiation use efficiency of maize cultivars. A split plots experiment performed based on randomized complete block design with three replications. Main plots were three levels, supplying 100%, 80% and 60% of total crop water requirement and sub-plots included maize cultivars, late maturity (704) average maturity (500) and early maturity (260). Results showed that 704 cultivar compare to 500 and 260 cultivars had more leaf area and dry matter at all levels of irrigation. In optimal irrigation, cultivars with longer growing period had less radiation use efficiency, but in low irrigation radiation use efficiency of 260 cultivar less than 500 and 704 cultivars. It seems that different in leaf area index and dry matter accumulation cased to different in defines radiation use efficiency.