تأثير دو روش آبياري تيپ و نشتي و سطوح مختلف نيتروژن و فسفر بر كميت و كيفيت بذر چغندر قند

Effect of two methods of tape and furrow irrigation and different levels of nitrogen and phosphorus fertilizer on quantity and quality of sugar beet seed

In this research experiment the interactions between two types of irrigations (furrow & tape) and four levels of nitrogen (0, 60,120,180kg/h) and three levels of phosphorus(0,30,60kg/h) were studied. The sugar beet variety 7233 was used. This experiment was conducted in the field station of Sugar Beet Seed Institute in Kamal- Shahr (Motahhari Station), Karadj in 2006. Experimental design was split factorial design which two types of irrigations were in main plots and factorial combination of four levels of nitrogen & three levels of phosphorus were in subplot using randomized complete block design with three replications. Results showed that water use efficiency in tape irrigation system was 1.66 higher than furrow irrigation. The number of established plants, percentage of bolting, above ground biomass, total seed yield in tape irrigation was more than furrow irrigation too. However, although the percentage of germination, one thousands seed weight, percentage of standard seed size yield (3.5-5.5 mm) and amount of plant phosphorus in furrow irrigation system were higher than tape irrigation system, those in but the differences were not significant. The numbers of established plants, percentage of bolting were not effected by the different levels of nitrogen or phosphorous. But, by increasing the levels of nitrogen or phosphorus the total biomass, above ground and total seed yield increased. The results of this experiment showed that since the tape irrigation system increases the total seed weight and decrease the consumed water, cloud be replaced with furrow irrigation system. In addition, on the basis of results of this test, application of 120 and 60 kg/h nitrogen and phosphorous are recommended.