Abstract
In order to determine the effects of planting pattern and drought stress on rice in Western Iran during 2005 to 2006, this research was performed. Experiment form was split plot in randomized complete block design with four replications. In this research, patterns of irrigation (I1, I2 and I3 = 10 cm water irrigation, five-dayalternate irrigation, and five-day alternate irrigation until the beginning of heading with 10 cm flooding till it gets to the ripening time, respectively) were the major factors and rice variations (Anbar boo, Tarem, Neda,Line 6 and Kadoos as V1, V2, V3, V4 and V5, respectively) were the minor factors. The results of this research showed that water limitation in procreative period and loading of seed induced decrease in the time required for it to reach the maximum weight and maximum amount of amylases, and also, water limitation in this period of growth and germination, decreased seed weight and amount of amylase in rice. The time of reaching tthe maximum amount of amylases in all treatments was less than the time of reaching the maximum seed weight. Also, water limitation in vegetable growth period is not efficient on seed weight and amount of amylases.
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