The Development Of Wheat Black Point Warning And Control Decision-making Expert System For Henan Province

Influence of sowing quantity,seedtime,irrigation and fertilization on Wheat Black point is researched.The results demonstrated:The influence of sowing quantity on Wheat Black point is not significant.The tendency to Wheat Black point rate is decreased with the postponed seedtime,but there is a little difference between breeds.Irrigation times and periods had effect on Wheat Black point and the effect of irrigation times is remarkable(the Wheat Black point rate is went up with increased irrigation times).And irrigation in florescence is in favor of occurement of Wheat Black point. The Wheat Black point rate is went up with increased dressing times in the condition of micro fertilization.Resistance of 44 wheat varieties (or lines) to black point has been identified under natural conditions in Henan from 2003 to 2005. Results show that there is no immune variety, but the resistance of different wheat varieties to black point is different significantly. 13.46 percent of them are resistant such as Yuyoul, Shanmai29 and so on. The mean rates of diseased grains of these varieties are less than 5%. Six varieties (or lines), such as Luomai4, Yunong 9901 etc., are high susceptible. Their average rates of diseased grains are more than 30.00%. Yuzhan9705, Yumai49 etc. fifteen varieties are light susceptible. Their average rates of diseased grains range within 5.0%～14.9%.Other seventeen varieties (or lines) are middle susceptible, such as Xinyuan958, Zhongyu6 and so on. In addition to, the results indicate that the some variety had different resistance type in different year. Comparing two methods (direct observation and cultivation on wet filter paper) to evaluate the resistance of wheat varieties (or lines) to black point, the results show that the mean rates of diseased grains with direct observation is lower than another method at large, but the trend of two methods' results is mainly identical.Dividable models of the south, north and middle of Henan province were constructed according to the trait of Wheat Black point and climate characters of Henan province. The regression equation in the north of Henan is (y|^)=0.167x₅-0.0288 x₄-3.812,R²=0.997,S=0.00697.The regression equation in the south of Henan is: (y|^)=0.217x₅+0.134x₁-14.188,R²=0.996,S=0.1804.The regression equation in the middle of Henan is (y|^)=0.08147 x₅+0.0352 x₃-2.574,R²=0.949,S=0.4878.In these models,x₁ shows the days of rainfall, x₃ shows the precipitation rain fall, x₄ shows the hours of sunlight, x₅ shows the relative humidity.Academic knowledge, technical system, scientific research production and experimental...