فيزيولوژي مقايسه اي گندم و نخود : شاخص سطح برگ دريافت و استفاده از تشعشع و توزيع ماده خشك به برگ ها

Comparative physiology of wheat and chickpea: Leaf area index, Interception and use of radiation and partitioned dry matter to leaves

In order to physiological comparison between wheat and chickpea, a randomized complete block design with four replications was conducted. The treatments were two chickpea cultivars (Hashem and 9096c) and two wheat cultivars (Zagros and Tajan). Wheat obtained maximum LAI and so the needed LAI to intercept 90% of radiation, earlier than chickpea. The value of KPAr was estimated as 0.68, 0.62, o.65 and 0.66 for Zagros, Tajan, Hashem and 9096c, respectively. The value of RUEpar was estimated as 3.09, 3.07, 2.85 and 2.5 gMJ"1 for for Zagros, Tajan, Hashem and 9096c, respectively. The value of partitioned dry matter to leaves befor heading (podding) in wheat was more than chickpea. The value of partitioned dry matter to leaves befor heading (podding) in wheat was more than chickpea, but this value was lesser for stem. A triphasic segmented regression model used to explanation of the biomass partitioning based on harvest index concept. The harvest index linearity increased after grain filling in wheat and chickpea and the slop of this linearity increasing between harvest indices versus time was significant between wheat and chickpea. The estimated parameters and obtained function in this study can be used in chickpea and wheat simulation models to simulate growth, development and yield.