Effects Of Fertilizer On Growth, Production And Nutritional Quality Of Lespedeza Davurica(Laxm.)Schindl

The fertilizer experiment was used Lespedeza davurica(Laxm.)Schindl domesticated species and designed by the optimal regression of "3414". N levels as Okg/hm2(CK),25kg/hm2,50kg/hm2and75kg/hm2, P levels as Okg/hm2(CK),45kg/hm2,90kg/hm2and135kg/hm2and K levels as0kg/hm2(CK),50kg/hm2,100kg/hm2and150kg/hm2. In order to provide theory basis for the high efficient cultivation of Lespedeza davurica in the frist year, the morphological indexes, production performance and nutritional quality were determined so as to analyse effects of different fertilizer treatments on the morphological indexes, production performance and nutritional quality of Lespedeza davurica. The results showed that:1Fertilizer induced increase of stem width, leaf length, compound leaf length, compound leaf width, internode length, thousand seed weight and number of podding in Lespedeza davurica was significant(P<0.05). With the increase of nitrogen fertilizer stem width increased continuously. With the increase of phosphorus fertilizer stem width increased before they were reduced, internode increased continuously. With the increase of potassic fertilizer stem width increased before they were reduced. The effect of N on internode length, leaf length, leaf width, compound leaf length and K on stem width was strong. Stem width, thousand seed weight and number of pod in N75P90K100which wasn’t significant compared with N50P90K100, leaf length, compound leaf length, compound leaf width in N50P90K100and internode in N50P135K100were got the maximum value. On the basis of mean variation coefficient in the same treatment, fertilizer application treatment had smaller variation coefficients than that of contral. The mean variation coefficient of N50P90K100was the minimum in which the growing of Lespedeza davurica showed more uniform than the others.2Fertilizer application could improve plant height, above ground biomass, stem height and dry weight to fresh weight ratio signifantly(P<0.05). With the increase of P, K above ground biomass increased continuously, while with increase of N above ground biomass increased before it was reduced. The yield-increasing effects of plant height, stem height, above ground biomass were greatly influenced by N, while dry weight to fresh weight ratio was influenced by P. Plant height and stem length had the maximum value, which was79.63cm and109.10cm respectively, in N50P90K100-Above ground biomass had the maximum value which was15113.80kg/hm2in N50P90K150and no significant difference compared with that in N50P90K100. dry weight to fresh weight ratio was the maximum which was0.515in N50P90K0.3Fertilizer application could improve the content of CP and EE (P<0.05) and reduce the content of NDF, ADF and tannin significantly (P<0.05) in Lespedeza davurica. With the application of N, P, K increasing, CP content increased before it reduced. With the application of N increasing, NDF, ADF reduced continuesly. With the application of P, K increasing, NDF, ADF increased before they were reduced continuesly. With the application of N increasing, tannin reduced continuesly. CP, NDF, ADF and tannin were greatly influenced by N. Which was a significant negative correlation between nitrogen levels and NDF content(R=0.968*, P<0.05), between and tannin content was a significant negative correlation(R=0.992**, P<0.01), EE content was influenced by P. CP content of N50P90K100got the maximum which was24.22%in heading stage. EE content got the maximum which was1.77%in N50P135K100. NDF and ADF reduced to the minimum which was41.85%and31.03%respectively. Tannin content got the minimum in N75P90K100and had no significant difference compared with that in N50P90K100(P>0.05).Above all, the treatment of N50P90K100was the best fertilization proportion in this experiment, for it could not only improve the plant growing uniform, but also got high quality and yield forage grass by improve the utilization efficiency of Fertilizer.