Influence Of Npk On Yield And Quality Of Sugar Beet In Different Ecology Regions Of Heilongjiang

In this dissertation, KWSO143sugar beet was selected as experimental sample, and experiments were made in the the western, central and eastern region of Heilongjiang Province selected out Jiusan research center, practice base of NEAU, Hongxinglong research institute in2009, based on the means of "3414" quadratic regression D-the optimal design, conducted field trials to study the effects of N, P, K fertilizers.Established fertilization model of quadratic, field trials in the western, central and eastern region of Heilongjiang Province were conducted to study the effects of N, P, K fertilizers suitable ratio on yield, sugar content and sugar yield. Through the comparative analysis of the dynamic changes of nitrogen, phosphorus, potassium content and dry matter accumulation in the whole plant, phyllome and beetroot during growth period under different treatments in three experimental sites, further analyzed about the correlation between NPK application and total NPK content and the correlation coefficient for NPK content with sugar beet root weight and sugar content in different growth and development periods. Announced the regulation effect of nitrogen, phosphorus and potassium fertilizer on NR and GS. This dissertation will fill in the infrastructure data of sugar beet physiology, proposes the best fertilization scheme, and it is of great practical significance to guide farmers to rational fertilization, improve the phenomenon of blind fertilization and reduce environment pollution.Results of this experiment are as following:1. Using fertilizer amounts of N, P2O5and K2O for experiment are120kg/hm2,90kg/hm2,90kg/hm2in order to gain the maximum yield and maximum sugar yield and their effects on yield are in order of N>P>K. It is showed that the recommended ratio of N: P2O5:K2O are: the western region1:0.60:0.44, the central region1:0.41:0.19and the eastern region1:0.51:0.48.2. At different stages there were significantly positive correlations between NPK content and the different utilization amount of nitrogen, phosphorus and potassium fertilizer under different treatments in three experimental sites.3. In three experimental sites, dry matter accumulation in the whole plant presents " S "-shape curve during the whole growth and development periods. The effect of nitrogen utilization amount of dry matter accumulation in the whole plant was highest and excessive phosphorus fertilization was not propitious to dry matter accumulation in three experimental sites. Dry matter accumulation in phyllome was single peak type, maximizing in the foliage formation and roots growth period and increases as the quantity of nitrogen application increases. The regulation approaches of beetroot was in keeping with the whole plant dry matter accumulation.4. In three experimental sites there were unsignificantly positive correlations between NPK content and root weight and there were unsignificantly negative correlations with sugar content. The influence of nitrogen fertilizer on root weight and sugar content were bigger than phosphor fertilizer and potassium fertilizer in the same experimental site. For the different experimental sites, NPK content increased gradually as root weight increased; as far as sugar content, NPK content reduced gradually as sugar content of root increased.5. During the whole growth and development periods of sugarbeet, the variation laws of the activities of NR was two-peak pattern curve under different treatments. The activities of NR was highest at seedling stage, and presented the second peak value from the later foliage formation period to the early tuber growth stage. At the same sampling date, the difference of treatments were great, The enzymatic activity of NRA increased as the quantity of nitrogen phosphorus and potassium application increased. The activities of GS was highest in phyllome at seedling stage, and presented the second peak value at the later foliage formation period. The activities of GS of roots was one-peak pattern curve and reach to the maximum at the early tuber growth stage.6. There were positive correlations between he different utilization amount of nitrogen, phosphorus and potassium fertilizer at different levels and the activities of NRA and GSA during the whole growth and development periods of sugar beet, there were significantly positive correlations between nitrogen fertilizer and the activities of enNRA at seedling stage; and there were significantly positive correlations between nitrogen fertilizer and the activities of exNRA at the later foliage formation period. At late stage there were significantly positive correlations between the activities of GSA in phyllome and nitrogen fertilizer; and there were significantly positive correlations between the activities of GSA of roots and nitrogen fertilizer from the later foliage formation period to the tuber growth stage.