نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه مهندسی آب دانشکده علوم کشاورزی دانشگاه گیلان
2 دانشگاه گیلان- مهندسی آب
3 استادیار پژوهش، مؤسسه تحقیقات برنج کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، رشت، ایران
چکیده
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Introduction
In addition to predicting yield, plant growth models have the ability to evaluate diversity and risks from different management scenarios. Crop modeling can help reduce the use of production resources for optimal or alternative management scenarios. The issue of improving water productivity in food production is one of the basic issues in different countries of the world, especially in countries with water scarcity, such as Iran. This study examines the physical productivity of water in paddy fields with the CERES-Rice model for three genotypes of rice under different regimes of irrigation and nitrogen fertilization managements.
Materials and methods
The experiment was conducted in the form of a split plot design based on a randomized complete block design with three replications. The main factors in this experiment include irrigation management at four levels: flood irrigation I1 and irrigation treatments I2, I3, and I4, which are periodic irrigation with irrigation intervals of 7, 14, and 21 days, respectively. In addition to the main factors, the secondary factors include different varieties of rice at three levels of Hashemi local certified varieties, M5 and M12 at three levels of nitrogen fertilizer including 60, 80 and 100 kg of nitrogen per hectare.
Research findings
The results showed that the predicted yields of the CERES-Rice model had the same trend as the actual yields and the response to irrigation treatments was similar to the measured yield values. With the aim of evaluating water productivity in a long-term statistical period, simulation by the model was carried out for the years 2005 to 2016. According to the results of the model, the irrigation cycle of 7 days at the fertilizer level of 100 kg of nitrogen per hectare is the best cycle for the studied years. In the 14 and 21 days irrigation interval, the nitrogen fertilizer level of 100 kg per hectare had good physical water productivity.
Conclusion
According to the results of the model, a 7-day irrigation interval at a fertilizer level of 100 kgN/ha is recommended as the best management for the tested years. In the 14 and 21 days irrigation interval, with the increase in the N fertilizer level in the fertilizer treatment of 100 kgN/ha, the physical productivity of water was suitable. According to the obtained results, in order to increase water productivity, it is recommended to develop 7-day irrigation interval and to train and promote proper utilization of it for farmers.
کلیدواژه‌ها [English]
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