Abstract
In order to determine the best irrigation withholding time in four varieties of rice, an experiment in factorial statistical format based on complete randomized block design was conducted. This experiment took place in National Rice Research Institute situated in Rasht township (Guilan province, North Iran) in 2008. First factor included four rice varieties (v1 = Khazar, v2 = Sepeed Roud, v3 = Hassani, and v4 = Binaam). The second factor included three drought periods (d1 = 1 week after flowering, d2 = 2 weeks after flowering, and d3 = 3 weeks after flowering). The statistical analysis results almost in most measured traits showed significant difference at 1% probability level. The highest grain yield of 5635.8 kg/ha was obtained of Sepeed Roud variety. Also, the interaction effect of V2d3 with 6000 kg/ha was recorded the maximum grain yield. But since one of the goals for conducting this study was to determine a variety with short-water-necessity period in water deficiency years of cultivation, it is recommended that V2d1 level with grain yield of 5325 Kg/ha be used even though it has a lower yield. Key words: Rice varieties, irrigation withholding time, yield, yields components, Iran.
Highlights
Rice (Oryza sativa L.) is the most important cereal crop in the world and it is the primary source of food and calories for about half of mankind (Khush, 2005)
Since one of the goals for conducting this study was to determine a variety with short-water-necessity period in water deficiency years of cultivation, it is recommended that V2d1 level with grain yield of 5325 kg/ha be used even though it has a lower yield
In order to study the determination of best irrigation withholding time in four varieties of rice in paddy fields of Guilan province (North Iran), an experiment in factorial statistical format based on complete randomized block design on a land parcel of 1000 m2 area in National Rice Research Institute situated in Rasht township (Guilan province) with 37 ̊ 12'5'' N latitude and 49 ̊ 38'30'' E longitude in 2008 was conducted
Summary
Irrigation withholding time management in four rice varieties at Guilan paddy fields (North Iran). In order to determine the best irrigation withholding time in four varieties of rice, an experiment in factorial statistical format based on complete randomized block design was conducted. This experiment took place in National Rice Research Institute situated in Rasht township (Guilan province, North Iran) in 2008. Since one of the goals for conducting this study was to determine a variety with short-water-necessity period in water deficiency years of cultivation, it is recommended that V2d1 level with grain yield of 5325 kg/ha be used even though it has a lower yield
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