چکیده:
In order to evaluate the yield, yield components and protein contents of two wheat cultivars (Zarrin and Gaspard)
in sole cropping and intercropping systems,an experiment was conducted using replacement serious technique and
different combinations of intercropping with high plant density and optimal of each cultivar. A factorial experiment
was conducted in the form of randomized complete block design (RCBD) with three replications at the research farm
of Agriculture Faculty of University of Zanjan at 2008-2009. The results showed that planting patterns has significant
effect (α= 0.01) on grain yield, the average number of grain per spike and protein content of each cultivar.The effect
of plant density levels on grain yield of Zarrin cultivar was significant (α= 0.01).The results indicated that the highest
grain yield(9611 kg ha-1) was obtained from 2:2 ratios of (50% Zarrin+50% Gaspard) cultivars in plant density of 400
seed per m2 which had Land Equivalent Ratio (LER) above 1.79.Land equivalent Ratio Index(LER) calculation
showed that all intercrops had advantage compare to sole cropping system.
خلاصه ماشینی:
Review of previous experiments results show that Bayat and Tabasi wheat intercropping in different plant density and combination to cause intercropping yield increase is the sole cropping systems (Mazaheri, 1990) and also the highest seeds yield was obtained from 50:50 ratios of Tajan(T) – Zagros(Z) cultivars in plant density of 400 seed in m2 which had Land Equivalent Ratio (LER) above 1.
The AYL is calculated according to the following formula (Banik, 1996): AYL =AYL Zarrin + AYL Gaspard (7) AYLZarrin ={[(YZG/XZG)/(YZ/XZ)]-1}, AYLGaspard ={[(YGZ/XGZ)/(YG/XG)]-1} (8) The AYL can have positive or negative values indicating an advantage or disadvantage accrued in intercrops when the main objective is to compare yield on a per plant basis.
The results indicated that the highest grain yield total was obtained from (2:2) ratios of Zarrin-Gaspard mixture with plant density 400 of seed in m2 which had Land Equivalent Ratio (LER) above 1.
In particular, AYL Zarrin had positive values in the all Zarrin-Gaspard mixture (Table 3), which indicates a yield advantage for Zarrin cultivar, robably because of the positive effect of Gaspard on Zarrin when grown in association, the Zarrin cultivar was the dominant one because the partial AYL of Zarrin cultivar was greater than the partial AYL of Gaspard, the AYL index can give more precise information than the other indices on the inter- and intra- specific competition of the component crops and the behavior of each species involved in the intercropping systems.