The combined effects of irrigation,nitrogen fertilization and aeration on growth of rice seedlings in cold regions

HAN Zhao; LIU Shaodong; LIN Yanyu

doi:10.13522/j.cnki.ggps.2025220

Abstract：[Objective]Water and nutrient management,combined with soil anaerobicity,is constraints to rice seedling greenhouse cultivation in cold regions.This paper investigates the combined effects of irrigation,nitrogen fertilization and aeration on growth of rice seedlings.[Method]The rice cultivar'Longdao 18'was used as the model plant.The experiment was designed using a quadratic regression orthogonal rotation design,with irrigation amount,nitrogen application rate and aeration frequency as the design factors.A regression model was established based on the experimental data to describe the relationships between seedling-growth traits and the irrigation amount,nitrogen application rate and aeration frequency.Factor analysis was used to comprehensively analyze the effects of these factors on seedling development,from which we extracted the most influential factors and the optimal irrigation-fertilization-aeration strategy for seedling greenhouse cultivation.[Result]Among all treatments,either irrigating 47.78 mm of water,applying 20 g/m2 of nitrogen,combined with an aeration frequency of 6 times/day;or irrigating 36.55 mm of water,applying 28.9 g/m2 of nitrogen,combined with an aeration frequency of 4 times/day,worked best for seedling development.In contrast,irrigating 47.78 mm of water,applying 5 g/m2 of nitrogen,combined with an aeration frequency of 3 times/day had the lowest comprehensive evaluation score and poorest seedling development.Response surface analysis indicated that when the irrigation amount was low,increasing nitrogen application and aeration frequency could significantly improve seedling growth.When nitrogen application was high,increasing aeration frequency could effectively promote the growth and physiological development of rice seedlings.[Conclusion]Our experimental results showed that the optimal irrigation-fertilization-aeration strategy for greenhouse rice seedling cultivation was:irrigating 36.55-59.01 mm of water,applying 20-28.9 g/m2 of nitrogen,with an aeration frequency of 4-6 times/day.