Study On Rice Growth Model In Heilongjiang Province

Crop simulation model was the research focus in agriculture information technique fields now. Agriculture information technique was a newly field with the development of information technique and agriculture science. In recent years, crop simulation model had already got great developments, which included concept, model and applying into production.This research took a great deal of domestic and international rice growth simulation as references. Experiments had been carried on in Heilongjiang Academy of Agriculture Science, which took Songjing 6 and Longdao 3 as material on the basis of physiology process of rice growth. Weather and experimenting data were acquired by FIELD SERVER(theフィ—ルドサ—バ) and CAMPBELL SCIENTIFIC INCCRIOX ( weather automatic observer) to confirm the parameter in the model. Then established and verified rice growth model.This article included three parts: (1) heading model; (2) assimilation distribution model; (3) influence of weather on rice growth model;1. Rice heading stage growth process was predicted by heading model.Field experiments carried on in Harbin which took 6 rice varieties as materials. These materials were main cultivars of early, medium and late variety in production of Heilongjiang. Investigation included seedling stage, transplant stage, young earring stage, heading stage and maturity stage. The number of plant per cave, effective ear, seeds on each ear, thousand seeds weight and length of ear were counted in laboratory.The influence of temperature on heading stage and the vegetative growth period were analyzed by weather data. The result showed that heading stage changed very greatly at different transplanting stage. Effective accumulated temperature was different obviously of different varieties from transplanting to heading stage. But effective accumulated temperature of each variety was steady. So heading stage model was accurate on the basis of accumulated temperature. Heading model was set up according to analyzing everyday temperature data more than 20 years in Harbin and Jiamusi which took Hejiang 19 as material.2. The concept of assimilation distribution coefficient is: ratio of each section dry weight increase and it of whole plant.Aboveground and underground assimilation distribution coefficient equation of Songjing 6 was set by analyzing data of experiments. Nutritious transfer coefficient before the heading stage was made sure. Aboveground and underground assimilation distribution simulation model was set up by distribution coefficient and total biomass. The condition of assimilation distribution can be accounted by this model. This model can explain and predict the relationship of dry material distribution coefficient and growth stage. Dry material distribution regulation aboveground and underground could be simulated by it.3. Rice growth model is the foundation of its growth simulation.Growth model was based on the characteristic of rice growth. The main factor that influenced rice growth was temperature. Turn point of dry weight S curve was influenced by accumulated temperature and it was in mid- July to mid-August. The speed of dry weight accumulation is the fastest in this time. The change of temperature had great influence on rice in heading stage, blooming stage and filling stage. Relationship of accumulated temperature and leaf was positive, which was negative in accumulated temperature and ear. Seedling and transplanting will be postponed when the accumulated temperature decrease, but heading stage and maturity will be advanced.