| China is a big country on facilities horticultural crop production, whose plant area of the facilities horticultural crop rank the first in the world, and vegetable is the main crop of facilities horticultural cultivation in china. With the accelerating of agricultural structure adjustment step, the area of protected cultivated vegetable with steel frame plastic shed has been expanded rapidly, and protected cultivation based on plastic shed has become the direction of new technological revolution in agricultural production industrialization. The research of horticultural crop model is an important part in crop model research fields, and it is perfecting of crop model study.On the basis of the domestic and overseas relative studies, and the field experiments for cultivars and nitrogen rate in2009and2010, and cultivars and water in2011, the models of nitrogen accumulation and partitioning based on product of temperature and light, and yield formation based on yield components and based on economic coefficient were built using system analysis method and mathematical modeling technique, integrating the quantitative relationship between the growth and development, nitrogen accumulation and partitioning, yield formation, and fruit protein content formation of the protected cultivated tomato and the environmental factors as well as biomass in accordance with crop eco-phsiology, the regulation of nitrogen accumulation and partitioning and the yield formation theory of protected cultivated tomato. The results were as follows:1. Models of the major impact factorsThe models of product of temperature and light, nitrogen, and water effect factor were constructed using mathematical modeling method. The growth and development of tomato can be explained and reflected better by a series of effect factor models.2. Models of nitrogen accumulation and partitioning in plant and fruit protein content for protected cultivated tomatoBased on the field experiments of cultivars and fertilizers in2009and2010, and cultivars and water in2011, the simulation models of nitrogen accumulation and partitioning in plant and fruit protein content for protected cultivated tomato were built by analyzing the relationship between partitioning index and product of temperature and light in accordance with the protected cultivated tomato growth characteristics in this paper. The models were validated using independent experiment dataset, and the results showed that RMSE, Xde, and R2between simulated and measured values of above-ground plant and root nitrogen accumulation were0.546g·m-2(n=36),0.447g·m-2, and0.956, respectively;0.041g·m-2(n=36),0.033g·m-2, and0.942, respectively. RMSE, Xde, and R2between simulated and measured values of stem, leaf and fruit nitrogen accumulation were0.165g(m-2(n=36),0.132g·m-2, and0.839, respectively;0.146g·m-2(n=36),0.099g·m-2, and0.945, respectively;0.246g·m-2(n=27),0.166g·m-2, and0.845, respectively. RMSE, Xde, and R2between simulated and measured values of protein content in tomato fruit were2.476%(n=27),2.103%, and0.850, respectively. It had better consistency between the measured and the simulated values, and indicated that the nitrogen accumulation and partitioning in plant and the fruit protein content of different cultivars, water and fertilizers levels in the protected cultivated tomato could be well simulated by these models.3. Models of buds, flowers, and fruits number for protected cultivated tomato plantBased on the field experiments of cultivars and fertilizers in2009and2010, and cultivars and water in2011, the simulation models of per plant buds, flowers, and fruits number for protected cultivated tomato were built by analyzing the relationship among the number of buds, flowers, flowers abscission, fruit letting, fruit abscission, and the environmental factors in different cultivars, fertilizer, and water levels in accordance with the rules of fruit formation in this paper. The model was validated using independent experiment dataset, the results showed that root mean squared error (RMSE), mean absolute error (Xde) and the determined coefficient (R) between simulated and measured values of buds for B1, B2, and B3were2.458(n=24),1.858, and0.972, respectively;1.827(n=24),1.426, and0.943, respectively;1.854(n=24),1.470, and0.941, respectively, and the RMSE, Xde, and R2between simulated and measured values of flowers was0.437(n=27),3.173, and0.864, respectively, and the RMSE, Xde, and R2between simulated and measured values of fruit letting was0.846(n=27),0.717, and0.928, respectively, and the simulated values agreed well with the measured ones. It indicated that the buds, flowers, and fruit letting of different cultivars, fertilizer, and water levels in the protected cultivated tomato could be well simulated by these models.4. Models of dry matter production and yield formation for the protected cultivated tomatoBased on the field experiments of cultivars and fertilizers in2009and2010, and cultivars and water in2011, the models of dry matter production and yield formation for protected cultivated tomato were built by analyzing the relationships between yield and the number of fruit letting and the mean fruit weight, between yield and biomass and the economic coefficient at harvest, and between the mean fruit weight and economic coefficient and biomass of different cultivars, fertilizer, and water levels in accordance with the theory of yield formation. Independent experiment dataset was used to validate the models. The results showed that RMSE, Xde, and R2between the simulated and measured values of dry matter production was363.135kg·hm-2(n=63),218.825kg·hm-2, and0.900, respectively, and RMSE, Xde, and R2between the simulated and measured values of yield based on yield components was164.595g per plant (n=27),135.605g per plant, and0.726, respectively, and RMSE, Xde, and R2between the simulated and measured values of yield based on economic coefficient was248.238g per plant (n=27),199.448g per plant, and0.622, respectively. It indicated that the dry matter production and yield formation under different cultivars, fertilizer, and water levels for protected cultivated tomato could be well simulated by these models. |
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