Effects Of Nitrogen Application On Yield And Quality Of Sugar Beet With Dew Drip Irrigation

【Objective】Xinjiang is one of the most important sugar base in China, in the drip irrigation of sugar beet yield increasing at the same time, decline in the rate of sugar containing has become the bottleneck of restricting the quality of sugar beet. To solve this problem, select cultivation in typical sugar beet varieties, by setting the nitrogen application control test analysis, different nitrogen application mode of sugar beet root cap structure built and source sink relationship regulation effect, put forward nitrogen management way for high yield and high sugar content for drip irrigation of sugar beet, to determine the arid area of seeding and drip irrigation of sugar beet nitrogen use efficiency in providing theoretical basis.【Methods】Selected in Northern Xinjiang planted sugarbeet varieties Beta356(United States BETASEED company) as the experimental material, through 2014 district control test, with no N fertilizer treatment as control. Analysis four kinds of nitrogen fertilizer after application ratio(in sugar beet foliage rapid growth period: the period of tuber enlargement: sugar accumulation period was 7:2:1, 5:4:1, 4:4:2, 3:7:0). On the basis of a year ago in 2015 also with no nitrogen treatment as control, set up the three nitrogen treatment in sugar beet foliage rapid growth stage: Tuberous intumescentia stage: sugar accumulation stage was 6:3:1, 5:3:2, 4:4:2). In three period determination of beet leaf area, dry matter accumulation, sugar content, leaf nitrogen content and photosynthetic characteristic parameters.【Results】 1. In 2014, N3 treatment of sugar beet yield than N0, N1, N2, N4 treatment increased by 79%, 14%, 16% and 28%, respectively, sugar yield increased by 72%, 17%, 6% and 42% respectively. Nitrogen agronomic efficiency increased by 39%, 50% and 99% respectively. In 2015, N2 treatment of sugar beet yield than N0, N1, N3 treatment increased by 179%, 10% and 5%, respectively, the sugar yield increased by 131%, 7% and 2% respectively; nitrogen agronomic efficiency increased by 16% and 8% respectively. 2. Rational nitrogen application can improve sugar beet leaf area index, especially in the period of tuber enlargement and sugar accumulation of small amount of nitrogen can maintain higher leaf area index, keep the photosynthetic rate, is conducive to the promotion of root enlargement. Nitrogen treatment and no nitrogen treatment on root potassium sodium content had no significant effects only on the ammonia nitrogen content produced significant differences, indicating that nitrogen fertilizer can increase the content of ammonia nitrogen in root, the ash content in root increased, thereby reducing the harvest when root sugar content. 3. Combined with different nitrogen treatments of drip sweet leaves area index and leaf dry weight, root dry weight and root containing sugar rate influence, the root tuber expanding stage, larger root shoot ratio, as a measure of Sugarbeet Growth center is smooth transfer sign, then the values in the range of 2 to 3; sugar accumulation tired period of root / shoot ratio, as a measure of the sugar beet harvest can obtain high yield of the logo, at this time the value of around 2. 4. Leaves from between the rapid growth period of NDVI and the total nitrogen content of leaves showed significant positive correlation, and therefore can simulate leaf nitrogen status and specific regression model: y = 2.86 X- 1.172(R2=0.829*) type of X for NDVI, y for the total nitrogen content in leaves of sugar beet.【Conclusion】Two years of field test shows that 2014 and obtain the maximum economic yield N3(4:4:2) compared with the treatment, 2015 N2(5:3:2) processing of sugar beet root economic traits more excellent. Therefore, it can be in 2015 N2 treatment as drip irrigation in north of Xinjiang Sugarbeet for high yield and quality of nitrogen application mode.