Effects Of Different Fertilizer Treatments On Wheat Canopy Architecture And Morphology Simulation Model Construction

The effects of treatments of urea, chicken manure and mixed fertilizer on canopy architecture,grain yield and quality of wheat at the same amount of nitrogen application were systematically studied in field randomized block experiment at Henan Agricultural University Research Station of Scientific Research and Teaching during 2005-2007.The experiment also further study morphology simulation model construction. The results of experiments were as follows:Firstly, From the jointing stage to filling stage, MTA,DIFN of treatments under urea, chicken manure and mixed fertilizer first decreased and then increased with the advance of growth stage. LAI,K of three treatments first increased and then decreased. The peak of four indexes appeared on the heading stage. From booting stage to 30 d after heading, wheat flag leaves'SPAD of three treatments first gentle increased and then rapid decreased with the advance of growth stage. DIFN had the positive correlations with MTA and the significant negative correlations with LAI. The correlation between DIFN and LAI was bigger than the correlation between DIFN and MTA. K had the significant negative correlations with MTA and the significant positive correlations with LAI.Secondly, During Jointing stage, average leaf angle of mixed fertilizer treatment was 53.89°, this number was less than that of urea and chicken manure treatment, and its leaf area index, light transmission rate and extinction coefficient was 4.63, 0.055 and 0.63, respectively, and in the middle of the three treatments. From booting stage to grain filling stage, the average leaf angle of mixed fertilizer treatment was 51.96°, and in the middle of the three treatments; Leaf area index and extinction coefficient number was 5.80 and 0.66, respectively, and were the biggest among the three treatments. Light transmission rate was 0.028, which was the least among the three treatments. Grains of per spike, spike weight, biomass yield, grain yield, quality of the mixed fertilizer treatment were all higher than that of the other two treatments. In general, canopy architecture of wheat was the best, and sunlight distribution was reasonable in mixed fertilizer treatment.Thirdly, Morphology simulation model construction of wheat in mixed fertilizer treatment was studied. A parallelly simulated model was developed based on the mechanism of feedback between plant morphological architecture and eco-physiological function. In the dissertation, the time interval was set by growth cycle ( GC ) and the architectural unit by metamer. The model was comprised of several sub-modules including developmental model, assimilate production model, and assimilate partitioning and accumulation model and organ's morphological construction model. The developmental module performs the predictions of wheat growth process based on the linear correlation between the increase in the number of metamers and the change in accumulative temperature. The results of experiments were as follows:Simulated with observed stem length and stem thickness's RMSE were 1.419 and 0.053. Simulated with observed value of growth of different leaf position and different sheath length's RMSE were 1.709 and 1.950. Simulated errors were all on allowed range. The show better prediction effect. The model construction were practical and effective.