Effects Of Interactions Of Water Management And Nitrogen Fertilizer In Rice Yield And Quality In Tillering Age In Cold Area

The aim of the study was to explore effects of water and nitrogen coupling on rice yield and quality in tillering age in cold area,which to provide a theoretical basis for reasonable application of nitrogen fertilizer and irrigation.This experiment used the completely random design of experiment,studying nitrogen application at the tillering age,irrigation requirements,which influents two factors on Japonica rice Kenjing 5 yield and quality in 2015 and 2016.To provide theoretical reference and technical support for high yield and good quality of rice in Heilongjiang province under water and fertilizer saving.The main results were as follows:1.Kenjing 5 total fertility during different fertility dynamic index reaches the best processing,to improve tiller earing rate of nitrogen fertilizer and water supply,N application relative to the water on its influence is greater.With N4S3 highest,followed by N3S3,and yield were significantly positive correlation(r = 0.523**).Leaf area index in full panicle stage to handle N3S4 supreme,the quality of dry matter in the solid phase to handle N3S4 is highest,and there was a positive correlation with yield(r = 0.127,r = 0.205).Stem and sheath output rate and conversion rate to handle N5S3 and highest N4S4,stem,sheath,output rate reached 7.08%,27.71% respectively,the stem and sheath conversion to handle N3S4 and highest N3S5,reached3.76%,19.17%,effectively improve the dry matter to the distribution ratio of the grain,and operating efficiency,and increase production.2.The physiological indexes of the optimal processing is not unified,but high N application rate or low moisture make physiological indexes,tillering stage N4S4 most plant total nitrogen content.Function leaf nitrate reductase activity handling N4S4 highest in heading stage.Soluble sugar content to handle N3S3 reaches the maximum,the conventional control increased by6.72%.Except for the nitrate reductase activity and has no significant negative correlation between rice grading,various physiological indicators and there was a positive correlation between yield and rice grading.Each index N application × there were extremely significant interaction effect between water(P<0.01).3.Panicle,middle and lower parts of the primary and secondary branch number(with the exception of the upper secondary branch number)and the correlation of grain number and grain weight and yield have reached the extremely significant level.In 2015 and in 2016 with the n application rate of 34.5 kg/ha,3 cm when water irrigation depth as the best configuration,2015 annual output up to 13105.26 kg/ ha,a blank yield increased by 153.33%,the difference of very significant level.2016 annual output up to 8937.28 kg/ha,a blank yield increased by 137.33%,the difference of extremely significant level,and N application×gainst each other between thewater yield of reached extremely significant level.4.In 2015,N3S3 rice score than N1S1(ck)increased by 8.28%.In 2016,processing N3S3 rice,highest rated more routine control increased by 1.02%.The test result shows those two years N3S3 for tillering stage nitrogen and water coupling rice taste value of the optimal processing.N application by the interactions between the soil moisture management effects significantly(P<0.01).The quality indexes have markedly improved.Nitrogen and moisture of appropriate dosage is beneficial to the improvement of rice yield and quality.The results showed that N application rate of 34.5 kg/ha,water irrigation depth of 3cm for this test section water saving fertilizer,the optimal processing in tillering stage.